[beagleboard] Re: Beaglebone Green - Experience and Notes
> several months later. > > I have let this sit for too long. I don't remember all the steps taken to > get the robot running. > using the i/o direct from the beaglebone green input/output seems to fry > the board randomly. i had bought some optoisolators but never used them.. > too large. The beagel bone io is problematic many cannot be used or mapped > correctly. > Starting over. > > 1) update and upgrade apt get. > > # apt-get update > # apt-get upgrade > > > 2) found a copy of the robot python files not sure what version they are. > copied zip file into cloud 9 directory. (see attached) > > # apt-get install unzip > # apt-get install zip > # unzip example.zip > The main program is app.py (i think) First run says flask-socket i/o not installed. 3) install flask socket io get the latest pip version # pip install --upgrade pip install socketio (fast install) # pip install flask-socketio Second run attempt askes for gevent 4) install gevent # pip install gevent (takes several minutes) > third run needs v4l2capture > 5) install v4l2capture installing v4l2capture # git clone https://github.com/philips/libv4l # cd libv4l # make #make install install v4l2capture git clone https://github.com/gebart/python-v4l2capture <https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgebart%2Fpython-v4l2capture=D=1=AFQjCNH_8JtC1AEeiP14mizcM21CX2VjJw> python-v4l2capture uses distutils. To build: ./setup.py build To build and install: ./setup.py install Now it runs... not sure if everything works, but the camera is sending video. > > > > > > > On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: >> >> Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) >> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/dbcacdb1-fc3d-4c3f-8d67-b820dfa40016%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
me (Chris M change) 7:43 PM (46 minutes ago) Restarting going to use universala for uart, pwm, and gpio (MRAA and ADAFruit_BBIO both work in python) web cam will be using python-v4l2capture > VERSION > # uname -a > Linux beaglebone 4.4.30-ti-r64 #1 SMP Fri Nov 4 21:23:33 UTC 2016 armv7l > GNU/Linux > UPDATE apt-get database > # apt-get update > REMOUNT EXT SD CARD > # mkdir /extsd > # mount /dev/mmcblk0p1 /extsd > # vi /etc/fstab > /dev/mmcblk0p1 /extsd ext4defaults0 0 > reboot and check > INSTALL PACKAGES > # apt-get upgrade installing v4l2capture # git clone https://github.com/philips/libv4l # cd libv4l # make #make install install v4l2capture git clone https://github.com/gebart/python-v4l2capture python-v4l2capture uses distutils. To build: ./setup.py build To build and install: ./setup.py install pip install pillow -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/a1bfb173-b364-4d30-8cdb-f600d133f527%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
Restarting going to use universala for uart, pwm, and gpio (MRAA and ADAFruit_BBIO both work in python) > VERSION > # uname -a > Linux beaglebone 4.4.30-ti-r64 #1 SMP Fri Nov 4 21:23:33 UTC 2016 armv7l > GNU/Linux > UPDATE apt-get database > # apt-get update > REMOUNT EXT SD CARD > # mkdir /extsd > # mount /dev/mmcblk0p1 /extsd > # vi /etc/fstab > /dev/mmcblk0p1 /extsd ext4defaults0 0 > reboot and check > INSTALL PACKAGES > # apt-get upgrade installing v4l2capture git clone https://github.com/philips/libv4l make make install pip install v4l2capture On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: > > Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/ea431428-a10c-4831-b397-2f5d0990c31f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
Finally some what of a break through,
Using OpenCv for just capturing a web cam seems wasteful and it doesn't
work well with the software decoding and re encoding jpegs from a mjpeg
stream. Also all the steps to set up pwm pins a / uart pins on the
beaglebone that Ive take to date seem to start other problems.
For web cam capture via a USB camera I found a v4l2 library that makes it
fast and simple. Install the v4l2capture library, it takes a few
iterations to get all the dependencies installed. see the camera script and
web server example pasted below.
for pin control i've been leaving the uEnv.txt file alone and using the
univeral(x) cape manager and config-pin (ex config-pin -a P9.24 uart) to
set pin function. there are still quirks and you have to reset pins on
reboot, but its been manageable. for instance if you load the cape manger
overlay directly it doesnt always work, but if it loads itself after
finding its not loaded when executing config-pin - a Px.xx it works
fine, also if you run config-pin -a to set a pin to uart it auto loads
cape-universal which doesnt let some pwm pins work, so its best to get
universala loaded first as one does not replace the other and I'm not sure
they can be unloaded with out cycling power.
https://github.com/cdsteinkuehler/beaglebone-universal-io
#camera.py
import select
import v4l2capture
import time
class VideoCamera(object):
#globals for testing
size_x=0
size_y=0
# intitialize
def __init__(self):
# grab camera
self.video = v4l2capture.Video_device("/dev/video0")
#set format the python version of v4l2 and v4l2capture API's are
not the great
size_x, size_y = self.video.set_format(640, 480, fourcc='MJPG')
print ('size :',size_x,size_y)
#create a memory buffer for the jpgs
self.video.create_buffers(1)
self.video.queue_all_buffers()
# start the vidoe capture process
self.video.start()
# destructor
def __del__(self):
self.video.close()
# capture image
def get_frame(self):
#before = time.clock()
#not sure what select.select is doing
select.select((self.video,), (), ())
# read and queue set the motion so to speak, with read alone you
only get the first image on start
jpeg = self.video.read_and_queue()
#print 1/(time.clock()-before)
return jpeg
#!/usr/bin/env python
# main.py
# Project: Video Streaming with Flask
# Author: Log0
# Date: 2014/12/21
# Website: http://www.chioka.in/
# Description:
# Modified to support streaming out with webcams, and not just raw JPEGs.
# Most of the code credits to Miguel Grinberg, except that I made a small
tweak. Thanks!
# Credits: http://blog.miguelgrinberg.com/post/video-streaming-with-flask
# Usage:
# 1. Install Python dependencies: cv2, flask. (wish that pip install works
like a charm)
# 2. Run "python main.py".
# 3. Navigate the browser to the local webpage (ex 192.168.8.100:5000).
from flask import Flask, render_template, Response
from camera import VideoCamera
import time
app = Flask(__name__)
@app.route('/')
def index():
return render_template('index.html')
def gen(camera):
# the timestart variable is an attempt to limit calls to get a camera
frame 1/.0333 (30) times per second to match the camera limit
timestart =time.clock()+.03
while True:
if time.clock() > timestart:
timestart=time.clock()+.03
frame = camera.get_frame()
yield (b'--frame\r\n'b'Content-Type: image/jpeg\r\n\r\n' +
frame + b'\r\n\r\n')
@app.route('/video_feed')
def video_feed():
return Response(gen(VideoCamera()),
mimetype='multipart/x-mixed-replace; boundary=frame')
if __name__ == '__main__':
app.run(host='0.0.0.0', debug=True)
On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote:
>
> Some thoughts and findings as I begin to learn the BBG (Beaglebone Green)
>
--
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[beagleboard] Re: Beaglebone Green - Experience and Notes
> > openvcv video capture is very slow 8 fps > - *0-CV_CAP_PROP_POS_MSEC* Current position of the video file in milliseconds or video capture timestamp. - *1-CV_CAP_PROP_POS_FRAMES* 0-based index of the frame to be decoded/captured next. - *2-CV_CAP_PROP_POS_AVI_RATIO* Relative position of the video file: 0 - start of the film, 1 - end of the film. - *3-CV_CAP_PROP_FRAME_WIDTH* Width of the frames in the video stream. - *4-CV_CAP_PROP_FRAME_HEIGHT* Height of the frames in the video stream. - *5-CV_CAP_PROP_FPS* Frame rate. - *6-CV_CAP_PROP_FOURCC* 4-character code of codec. - *7-CV_CAP_PROP_FRAME_COUNT* Number of frames in the video file. - *8-CV_CAP_PROP_FORMAT* Format of the Mat objects returned by retrieve() . - *9-CV_CAP_PROP_MODE* Backend-specific value indicating the current capture mode. - *10-CV_CAP_PROP_BRIGHTNESS* Brightness of the image (only for cameras). - *11-CV_CAP_PROP_CONTRAST* Contrast of the image (only for cameras). - *12-CV_CAP_PROP_SATURATION* Saturation of the image (only for cameras). - *13-CV_CAP_PROP_HUE* Hue of the image (only for cameras). - *14-CV_CAP_PROP_GAIN* Gain of the image (only for cameras). - *15-CV_CAP_PROP_EXPOSURE* Exposure (only for cameras). - *16-CV_CAP_PROP_CONVERT_RGB* Boolean flags indicating whether images should be converted to RGB. - *17-CV_CAP_PROP_WHITE_BALANCE* Currently not supported - *18-CV_CAP_PROP_RECTIFICATION* Rectification flag for stereo cameras (note: only supported by DC1394 v 2.x backend currently) -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/b3ec3a72-fd22-4830-92ee-33bf8a14d0d7%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
brightness (int): min=-64 max=64 step=1 default=0 value=0 contrast (int): min=0 max=64 step=1 default=32 value=32 saturation (int): min=0 max=128 step=1 default=64 value=64 hue (int): min=-40 max=40 step=1 default=0 value=0 white_balance_temperature_auto (bool) : default=1 value=1 gamma (int): min=72 max=500 step=1 default=100 value=100 gain (int): min=0 max=100 step=1 default=0 value=0 power_line_frequency (menu) : min=0 max=2 default=1 value=1 white_balance_temperature (int): min=2800 max=6500 step=1 default=4600 value=4600 flags=inactive sharpness (int): min=0 max=6 step=1 default=3 value=3 backlight_compensation (int): min=0 max=2 step=1 default=1 value=1 exposure_auto (menu) : min=0 max=3 default=3 value=1 exposure_absolute (int): min=1 max=5000 step=1 default=157 value=157 exposure_auto_priority (bool) : default=0 value=1 brightness (int): min=-64 max=64 step=1 default=0 value=0 contrast (int): min=0 max=64 step=1 default=32 value=32 saturation (int): min=0 max=128 step=1 default=64 value=64 hue (int): min=-40 max=40 step=1 default=0 value=0 white_balance_temperature_auto (bool) : default=1 value=1 gamma (int): min=72 max=500 step=1 default=100 value=100 gain (int): min=0 max=100 step=1 default=0 value=0 power_line_frequency (menu) : min=0 max=2 default=1 value=1 white_balance_temperature (int): min=2800 max=6500 step=1 default=4600 value=4600 flags=inactive sharpness (int): min=0 max=6 step=1 default=3 value=3 backlight_compensation (int): min=0 max=2 step=1 default=1 value=1 root@beaglebone:/var/lib/cloud9# v4l2-ctl --device=/dev/video0 --set-ctrl=exposure_auto=0 VIDIOC_S_EXT_CTRLS: failed: Invalid argument Error setting controls: Invalid argument root@beaglebone:/var/lib/cloud9# v4l2-ctl --device=/dev/video0 --set-ctrl=exposure_auto=6 VIDIOC_S_EXT_CTRLS: failed: Numerical result out of range Error setting controls: Numerical result out of range root@beaglebone:/var/lib/cloud9# v4l2-ctl --device=/dev/video0 --set-ctrl=exposure_auto=4 VIDIOC_S_EXT_CTRLS: failed: Numerical result out of range Error setting controls: Numerical result out of range root@beaglebone:/var/lib/cloud9# v4l2-ctl --device=/dev/video0 --set-ctrl=exposure_auto=3 root@beaglebone:/var/lib/cloud9# v4l2-ctl --device=/dev/video0 --set-ctrl=exposure_auto=3 > > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/a530a08a-b9a8-4bb7-87bc-c36166f8d700%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
Just had a WTF moment. I was working on a BBG image that was still on an sd card. and it appears as if pwm and uart pins are all properly configured out of the box. This was definately not the case on the flashed version. Still trying to figure out if UART actual is working out of the box, it appears it is untill i try to communicate with my camera. Going to try the minicom test. On reset the ttyO1...O5 disappeared. DOest not work out of the box back to fixing pwm -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/17c14890-ca5f-48cf-8301-234401341464%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
RobertCNelson 6/12/14 On Thu, Jun 12, 2014 at 8:16 AM, <cla...@logmatch.com.br> wrote: > Hi Again > > I try this configuration on /boot/uEnv.txt > optargs=capemgr.enable_partno=BB-UART1,BB-UART2,BB-UART4 > > but it doesn't work. > > The only way I could do this, is by using this command > echo BB-UART2 > /sys/devices/bone_capemgr.*/slots > > Can someone explain me why ? probally the wrong "uEnv.txt" dmesg | grep console would prove that - show quoted text - On Tuesday, November 15, 2016 at 10:15:15 PM UTC-6, Chris M wrote: > > 7)Setting up a link sprite LS-Y201 camera I bought. > > It took some time to get the UART pins to work on the BBG. > > ISSUE FOUND: > The UART pins are not enabled by default as UART pins. I tried several > methods, and ended up following the instructions posted here ( > http://tinkernow.com/2015/01/beaglebone-black-rs232-uart-setup/) to set > up and test the pins. > > SOLUTION: > Changing adding the pins to the /boot/uEnv.txt file allowed the minicom > test to work. > You cannot install minicom with apt get / dpkg until you update the > package library (apt-get update) at the root dir > > > > end entry 7 > > > > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/63727924-43d1-4e56-a5b4-5569a822d1c9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
ref link https://billwaa.wordpress.com/2014/10/02/beaglebone-black-enable-on-board-serial-uart/ On Thursday, November 24, 2016 at 12:52:04 PM UTC-6, Chris M wrote: > > added thefollowing ot get it to work the second time > > root@beaglebone:/sys/devices/platform/bone_capemgr# echo BB-UART1 > slots > root@beaglebone:/sys/devices/platform/bone_capemgr# echo BB-UART2 > > slots > root@beaglebone:/sys/devices/platform/bone_capemgr# echo BB-UART3 > > slots > root@beaglebone:/sys/devices/platform/bone_capemgr# echo BB-UART4 > > slots > root@beaglebone:/sys/devices/platform/bone_capemgr# echo BB-UART5 > > slots > root@beaglebone:/sys/devices/platform/bone_capemgr# ls > baseboard driver_override of_node slot-4 slot-6 slot-8 subsystem > driver modalias powerslot-5 slot-7 slots uevent > root@beaglebone:/sys/devices/platform/bone_capemgr# cat slots > 0: PF -1 > 1: PF -1 > 2: PF -1 > 3: PF -1 > 4: P-O-L- 0 Override Board Name,00A0,Override Manuf,BB-UART1 > 5: P-O-L- 1 Override Board Name,00A0,Override Manuf,BB-UART2 > 6: P-O-L- 2 Override Board Name,00A0,Override Manuf,BB-UART3 > 7: P-O-L- 3 Override Board Name,00A0,Override Manuf,BB-UART4 > 8: P-O-L- 4 Override Board Name,00A0,Override Manuf,BB-UART5 > root@beaglebone:/sys/devices/platform/bone_capemgr# dmesg | grep ttyO > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/cdb44009-bea4-49c6-b195-029e9ef4a62c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
added thefollowing ot get it to work the second time root@beaglebone:/sys/devices/platform/bone_capemgr# echo BB-UART1 > slots root@beaglebone:/sys/devices/platform/bone_capemgr# echo BB-UART2 > slots root@beaglebone:/sys/devices/platform/bone_capemgr# echo BB-UART3 > slots root@beaglebone:/sys/devices/platform/bone_capemgr# echo BB-UART4 > slots root@beaglebone:/sys/devices/platform/bone_capemgr# echo BB-UART5 > slots root@beaglebone:/sys/devices/platform/bone_capemgr# ls baseboard driver_override of_node slot-4 slot-6 slot-8 subsystem driver modalias powerslot-5 slot-7 slots uevent root@beaglebone:/sys/devices/platform/bone_capemgr# cat slots 0: PF -1 1: PF -1 2: PF -1 3: PF -1 4: P-O-L- 0 Override Board Name,00A0,Override Manuf,BB-UART1 5: P-O-L- 1 Override Board Name,00A0,Override Manuf,BB-UART2 6: P-O-L- 2 Override Board Name,00A0,Override Manuf,BB-UART3 7: P-O-L- 3 Override Board Name,00A0,Override Manuf,BB-UART4 8: P-O-L- 4 Override Board Name,00A0,Override Manuf,BB-UART5 root@beaglebone:/sys/devices/platform/bone_capemgr# dmesg | grep ttyO -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/a63011ff-9e9c-49c5-8b76-8f68045ab732%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
9) web camera
A clean install of a new bbg image and opencv lead to good results.
IM using an ELP- ELP-USB500W05G-FD100 USB camera. The minimum resolution
is 640x480@ 30fps.
using the following to get images form the camera and encode the data
(after opencv decodes it) yields about .06sec per image (15 fps) with about
1-2 sec lag between realtime and the image displayed in a browser.
(@640x480, 50% jpeg quality)
I don't know why it makes sense to go form a jpeg stream (mjpeg) to raw
data the back to jpegs, but that is an openCV limitation for now.
code grabbed and modified from (Website: http://www.chioka.in/)
I think the BBG is not well suited for this type of use, but it will be ok.
import cv2
import time
class VideoCamera(object):
def __init__(self):
# Using OpenCV to capture from device 0. If you have trouble
capturing
# from a webcam, comment the line below out and use a video file
# instead.
self.video = cv2.VideoCapture(0)
print( 'camera initialized? ', self.video.isOpened())
self.video.set(3,640)
self.video.set(4,480)
self.video.set(5,30)
# If you decide to use video.mp4, you must have this file in the
folder
# as the main.py.
#self.video = cv2.VideoCapture('video.mp4')
def __del__(self):
self.video.release()
def get_frame(self):
#before = time.clock()
success=self.video.grab()
success,image = self.video.retrieve()
# We are using Motion JPEG, but OpenCV defaults to capture raw
images,
# so we must encode it into JPEG in order to correctly display the
# video stream.
encodeoptions =[cv2.IMWRITE_JPEG_QUALITY,50]
ret, jpeg = cv2.imencode('.jpg', image,encodeoptions)
#print time.clock()-before
return jpeg.tostring()
On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote:
>
> Some thoughts and findings as I begin to learn the BBG (Beaglebone Green)
>
--
For more options, visit http://beagleboard.org/discuss
---
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[beagleboard] Re: Beaglebone Green - Experience and Notes
10) installing flask/ flaskio, etc. pip install On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: > > Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/4e743484-f378-4ada-bf6d-7c2beb27cca4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
mount them. Field definitions /etc/fstab contains the following fields separated by a space or tab: - ** - defines the storage device (i.e. /dev/sda1). - ** - tells the mount command where it should mount the to. - ** - defines the file system type of the device or partition to be mounted. Many different file systems are supported. Some examples are: ext2, ext3, reiserfs, xfs, jfs, smbfs, iso9660, vfat, ntfs, swap, and auto. The 'auto' type lets the mount command to attempt to guess what type of file system is used, this is useful for removable devices such as CDs and DVDs. - ** - define particular options for filesystems. Some options relate only to the filesystem itself. Some of the more common options are: - *auto* - file system will mount automatically at boot, or when the command 'mount -a' is issued. - *noauto* - the filesystem is mounted only when you tell it to. - *exec* - allow the execution binaries that are on that partition (default). - *noexec* - do not allow binaries to be executed on the filesystem. - *ro* - mount the filesystem read only. - *rw* - mount the filesystem read-write. - *sync* - I/O should be done synchronously. - *async* - I/O should be done asynchronously. - *flush* - specific option for FAT to flush data more often, thus making copy dialogs or progress bars to stays up until things are on the disk. - *user* - permit any user to mount the filesystem (implies noexec,nosuid, -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/8e8cba3d-8cd8-49e5-9996-8e3a1e2bd834%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
http://www.tecmint.com/useful-basic-commands-of-apt-get-and-apt-cache-for-package-management/ more commds to upgrade your installed software packages -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/d01710b7-638c-45ef-a34e-0af511974748%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
spent the weekend trying to get a usb web cam to work with python there are many false trails on the internet. ended up following http://www.chioka.in/python-live-video-streaming-example/ https://github.com/log0/video_streaming_with_flask_example and https://blog.miguelgrinberg.com/post/video-streaming-with-flask installed pythons opencv took some time to get things too work. time out error was solved by http://stackoverflow.com/questions/27769561/opencv-python-cv2-videocapture0-grab-and-cv2-videocapture0-read-hangs using mjpeg compression relies on the BBB to decode (tobyte() command is really tostring() command. making live streaming very slow and laggy. began to explore opencv with neon per http://blog.lemoneerlabs.com/3rdParty/Darling_BBB_30fps_DRAFT.html and http://vuanhtung.blogspot.com/2014/04/and-updated-guide-to-get-hardware.html after installing opencv per their instructions i kept getting a file too small error when importing cv2 decide try to reinstall debian image and start over. On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: > > Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/dab559b0-680f-4eb4-99a1-6031f29dd488%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
9) things to install and update after image is installed. Mount an external sd card for extra storage. # df -h tells you what is mounted # fdisk -l | grep '^Disk' Disk /dev/mmcblk1: 3.7 GiB, 3909091328 bytes, 7634944 sectors Disk /dev/mmcblk0: 7.4 GiB, 7948206080 bytes, 15523840 sectors tells you all the storage devices manage partitions # fdisk /dev/mmcblk0 format partition (mmcblk0p1)can change depending on situation # mkfs.ext3 /dev/mmcblk0p1 mount the disk at a new folder # mkdir /extsd # mount /dev/mmcblk0p1 /extsd update apt-get # apt-get update install cmake again -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/83bfd5ac-11ef-40b9-9a16-d19ddc6b4810%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
9) More useful links Camera user manual. http://www.linksprite.com/upload/file/1274419957.pdf Camera programming python examples http://learn.linksprite.com/pcduino/arduino-ish-program/uart/taking-pictures-with-a-pcduino-a-linksprite-jpeg-color-camera-ttl-interface/ UART setup http://tinkernow.com/2015/01/beaglebone-black-rs232-uart-setup/ https://raw.githubusercontent.com/SeeedDocument/BeagleBone_Green/master/images/PINMAP_UART.png On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: > > Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/0eb1c3dc-cf9b-4b85-8b9c-a5618e1c434c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
8) Setting up a link sprite LS-Y201 camera continued. Some searching on the internet lead me to this site( http://bradsmc.blogspot.com/2013/05/taking-larger-pictures-with-pcduino.html). I used his work to create two python programs 1st to take pictures and the 2nd to change the picture sizes. (Ill post them sepaerately) ISSUES LINKSPRITE CAMERA changing the baud rate not very intuitive. soem time the change is persistent othertime not. SOLUTION Always set the baud to default on exit. On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: > > Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/2fc69972-9455-44b1-afce-58652d9ff1b3%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
7)Setting up a link sprite LS-Y201 camera I bought. It took some time to get the UART pins to work on the BBG. ISSUE FOUND: The UART pins are not enabled by default as UART pins. I tried several methods, and ended up following the instructions posted here (http://tinkernow.com/2015/01/beaglebone-black-rs232-uart-setup/) to set up and test the pins. SOLUTION: Changing adding the pins to the /boot/uEnv.txt file allowed the minicom test to work. You cannot install minicom with apt get / dpkg until you update the package library (apt-get update) at the root dir end entry 7 -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/72d91c42-1362-4b18-852d-080c3c9c5efd%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
Period 1 us <https://lh3.googleusercontent.com/-O-UyKVtWV84/WCkTnw92MbI/AAs/NIkoUuVg3Go-VQucevuVT2YVBa092n9fQCLcB/s1600/20161113_191801.jpg> On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: > > Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/b6cb3dec-b45e-4336-9af8-3efd2c2ce78c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
6) PWM experiments
I wrote three python scripts to run pwm on mraa pin 62 (P9-16). Remembering
the mraa library is now v1.0 and not 1.5.
period range max <1 sec. min 1us (using _us)
when using .write() to set the duty cycle results in some screwy things
happening and locking up of the pwm chip. I quickly decided it is best to
us .pulsewidth() to directly set the value.
pulsewidth(), pulsewidth_ms() minimum value cannot be less than 1ms
(.001sec) the max cannot be more than the period.
I had the best luck with "_us" range, and did not experience pulse width
related hardware/ software crashes.
I could get the pwm chip to generate signals from 1us period to 1x10^6 us
period, that i could see on my scope.
import mraa
print (mraa.getVersion())
# set up pins to run stepper motor pulse & direction
pin = mraa.Pwm(62)
pindir = mraa.Gpio(59)
#set initial direction of motor, 1st tell pin that it is to send a signal
(dir), then write value (0 or 1)
pindir.dir(mraa.DIR_OUT)
pindir.write(0)
# variable to set frequency and pulse width for testing
period = 100
#enable the pwm pin
pin.enable(True)
# initialize the pin
pin.period_us(period)
#set the pulsewidth to 25% of the period
pin.pulsewidth_us(int(period/4))
#program loop it is not necessary to write to the pin every loop
while period <> 0:
period = input("integer(us)number /0 to quit: ")
pin.pulsewidth_us(0)
pin.period_us(period)
pin.pulsewidth_us(int(period/4))
# a bit of clean up
pin.enable(False)
On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote:
>
> Some thoughts and findings as I begin to learn the BBG (Beaglebone Green)
>
--
For more options, visit http://beagleboard.org/discuss
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[beagleboard] Re: Beaglebone Green - Experience and Notes
5) Useful links so far. mraa API http://iotdk.intel.com/docs/master/mraa/python/mraa.html Installing gzip packages in linux http://www.howtogeek.com/howto/uncategorized/linux-quicktip-downloading-and-un-tarring-in-one-step/ DRV8825 wiring https://www.google.com/url?sa=i=j==s=images==0ahUKEwinpaCL86bQAhVHLmMKHTSUDbcQjRwIBw=https%3A%2F%2Fwww.pololu.com%2Fproduct%2F2133=AFQjCNHfawLO3bcXp0kBk-BSjhkyHYlGRQ=1479166590204138=rjt Beagle bone OS images http://beagleboard.org/latest-images Cmake https://cmake.org/install/ BBG mraa pin mapping http://www.seeed.cc/project_detail.html?id=1592 End entry 5 On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: > > Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/717ba843-ff67-401c-b0aa-d6f23d203e29%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
4) playing with stepper motors - Python I first mimicked the bonescript to us the GPIO pins to run the stepper motor. I noticed I could run it faster than I could with bonescript, but would still get the same issues just at better speeds. I then tried setting the pin to run as a PWM output. ISSUES FOUND: USING GPIO is not a good solution for running stepper motors. Issuing the mrraa.write(0.xx) would cause a buffer overrun when setting the PWM duty cycle and crash the program, Using pin.pulsewidth_us(xxx), pulsewidth_ms(xxx), or pulsewidth(x.xx) to set the duty cycle directly would work, but when values got out of range the pwm chip would become locked requiring the BBG to have to be reset.. SOLUTION: 1) false trail. Upgrade the mraa library (the BBG came with v 0.95) to version 1.5.x. this was pretty tough for an absolute beginner like me. Needed swig3.0, which can be installed using debians dpkg. Need Cmake which was somewhat difficult to get an image of with out having an sd card. it took some time to get it installed. mraa installs files in sys/local/lib vs sys/lib like cloud9 expects to see. Once mrraa was installed, i had to correct ly place a few files to get it to work, but mraa 1.5 would fail to initalize pwm on the pins, I dont know why as using mraa commands to check the pins always returned correct values, but it still failed. 2) current state. I bought a micro SD card and installed the latest BBG image on the eprom. This came with mraa1.0. Still all the BBIO python examples are junk. You no longer get a buffer overrun using mraa.write(), but you can still lock up the pwm. End entry 4 On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: > > Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/6611fa64-374e-48ae-b64b-5b41d749592e%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
3) playing with stepper motors - Python My next try was to use python as there are many included examples with the Cloud9 IDE. ISSUE FOUND: Importing the BBIO library causes the python program to crash. Apparently, BBIO is not yet compatible with the linux kernel (4.x) the BBG ships with. Almost all the python tutorials rely on BBIO and there most are broken. SOLUTION: I did not try using an older beaglebone image as I was worried it would loose the WIFI functionality of the BBG. instead I tried using the MRAA library in python import mraa #Python script On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: > > Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/855a6521-f807-4714-bfd6-0e343eb15e42%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
2) playing with stepper motors. I hooked up a nema 17 stepper motor via a DRV8825 Stepper Motor Driver basically using the same led tutorial bone script to drive the GPIO pins to run it. The DRV8825 current limit instructions and youtube videos are unclear how to set up. I learned the hard way and wrecked a few of them in the process. The way i found to set them up was to wire them up completely under no power (make sure to use the 3.3VDC power from the BBG and do not use the 5VDC) with the motor disconnected. Then power them up first the BBG then the external power supply for the stepper motor. Then the correct voltage between the ground (common BBG and external PS) and the potentiometer cover can be read.) I set the voltage to .6VDC for testing. ISSUE FOUND: Bonescript is not really fast enough or even intend to run stepper motors by togging the pin outputs. Even at slow speeds there would be numerous missed steps and poor behavior. My oscilloscope showed this to be true at the BBG and not after the DRV8825. SOLUTION: Don't us bonescript. Now the fun begins, next try Python. End Entry 2 On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: > > Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/11c2c086-2b08-4dc3-b46c-11a5186624d7%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Re: Beaglebone Green - Experience and Notes
1) The first tutorial blinking the four onboard leds. I did the tutorial using bonescript and also by using echo > at the prompt to change the corresponding files ( /sys/class/leds/beaglebone\:green\:usrx) ISSUE FOUND: One thing I wrestled with was the leds by default do not follow the predescribed operational pattern. Echoing "none" to the trigger files and other changes to the bonescript did not have any affect. The leds would continue to alternate 1,3 lit then 2,4 lit. It was obvious that something else was writing to the leds and was interfering with the tutorials. SOLUTION: I found that if I connected to the BBGw with my phone and clicked "done" every time the BBGw is turned on or reset, the leds would then go back to their stated mode of operation. and allow the tutorials to work properly. End entry 1. On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: > > Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/4117e9ff-4810-47c0-a22d-d8280544499a%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Beaglebone Green - Experience and Notes
Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/700021c8-f9ca-443b-b6fe-965f7f4ced50%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Notes on using Beaglebone Green from a novice
Hello All, Ive spent a few frustrating days wading through an alien environment which is called the Beaglebone green (BBG for the pros). and the debian / cloud9 ide environment and would like to share some of the things I find as a go along. (Disclaimer I am a mechanical engineer, and barely know anything about linux, python, bonescript, etc.) -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/6832058c-58d4-4d02-80b1-e1b0819244d5%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
