Revision: 1888
Author: [email protected]
Date: Wed Apr 7 09:16:40 2010
Log: RC motor speed controllers also work, updated servo tutorial. fixed
one image. topublish.
http://code.google.com/p/jallib/source/detail?r=1888
Added:
/trunk/doc/dita/tutorials/images/servo_rc_master_circuit.jpg.jpg
/trunk/doc/dita/tutorials/images/servo_rc_motor_speed_control.jpg
Modified:
/trunk/doc/dita/TOPUBLISH
/trunk/doc/dita/tutorials/tutorial_changelog.xml
/trunk/doc/dita/tutorials/tutorial_servo_rc_master.xml
=======================================
--- /dev/null
+++ /trunk/doc/dita/tutorials/images/servo_rc_master_circuit.jpg.jpg Wed
Apr 7 09:16:40 2010
Binary file, no diff available.
=======================================
--- /dev/null
+++ /trunk/doc/dita/tutorials/images/servo_rc_motor_speed_control.jpg Wed
Apr 7 09:16:40 2010
Binary file, no diff available.
=======================================
--- /trunk/doc/dita/TOPUBLISH Tue Apr 6 14:58:00 2010
+++ /trunk/doc/dita/TOPUBLISH Wed Apr 7 09:16:40 2010
@@ -18,13 +18,13 @@
# is generated.
# ditamap
-tutorials/tutorials.ditamap japp_config.py
2010040602
+tutorials/tutorials.ditamap japp_config.py
2010040702
# DITA xml
tutorials/license.xml japp_config.py
2010040601
tutorials/tutorial_adc_intro.xml japp_config.py
2010031201
tutorials/tutorial_basics.xml japp_config.py
2010012501
tutorials/tutorial_blink_a_led.xml japp_config.py
2010012901
-tutorials/tutorial_changelog.xml japp_config.py
2010040601
+tutorials/tutorial_changelog.xml japp_config.py
2010040702
tutorials/tutorial_externals.xml japp_config.py
2010012501
tutorials/tutorial_getting_started.xml japp_config.py
2010021101
tutorials/tutorial_gp2d02.xml japp_config.py
2010040601
@@ -42,7 +42,7 @@
tutorials/tutorial_sd_card.xml japp_config.py
2010040101
tutorials/tutorial_serial_communication.xml japp_config.py
2010012501
tutorials/tutorial_serial_port_board.xml japp_config.py
2010012501
-tutorials/tutorial_servo_rc_master.xml japp_config.py
2010040601
+tutorials/tutorial_servo_rc_master.xml japp_config.py
2010040702
tutorials/tutorial_spi_introduction.xml japp_config.py
2010021101
tutorials/tutorial_spi_sram_23k256.xml japp_config.py
2010040101
=======================================
--- /trunk/doc/dita/tutorials/tutorial_changelog.xml Tue Apr 6 14:58:00
2010
+++ /trunk/doc/dita/tutorials/tutorial_changelog.xml Wed Apr 7 09:16:40
2010
@@ -26,7 +26,7 @@
</row>
<row>
<entry>2010/04/05</entry>
- <entry>Added servo tutorial</entry>
+ <entry>Added RC servo & motor speed control
tutorial</entry>
</row>
<row>
<entry>2010/04/01</entry>
=======================================
--- /trunk/doc/dita/tutorials/tutorial_servo_rc_master.xml Tue Apr 6
14:58:00 2010
+++ /trunk/doc/dita/tutorials/tutorial_servo_rc_master.xml Wed Apr 7
09:16:40 2010
@@ -1,18 +1,21 @@
<?xml version='1.0' encoding='UTF-8'?>
<!-- This document was created with Syntext Serna Free. --><!DOCTYPE topic
PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd" []>
<topic id="sram_23k256">
- <title>RC Servo Control</title>
+ <title>RC Servo Control & RC Motor Speed Control</title>
<prolog>
<author>Matthew Schinkel</author>
<publisher>Jallib Group</publisher>
</prolog>
<body>
- <p id="firstcontent">PIC servo control for RC servos used in the Radio
Control hobby.</p>
+ <p id="firstcontent">PIC RC servos and RC speed controllers used in
the Radio Control hobby.</p>
<section>
<title>Servo Control Intro</title>
</section>
- <p>RC or R/C (Radio Control) servos are mostly used in the radio
control hobby to control things like RC Cars, RC airplanes, boats, robots,
etc. Servos are used for there positioning capability and strength. Small,
regular sized servos can be bought at a local hobby store for $10 or less.
Of course there are more expansive ones depending on the quality and size.
These servos normally plug into your radio control receiver, but today we
will connect it to your PIC.</p>
- <image href="images/servo_rc_master_servo.jpg" width="200"
otherprops="clickable"/>
+ <p>RC or R/C (Radio Control) servos and RC motor speed controllers are
used in the radio control hobby to control things like RC Cars, RC
airplanes, boats, robots, etc. </p>
+ <p>Servos are used for there positioning capability and strength.
Small, regular sized servos can be bought at a local hobby store for $10 or
less. Of course there are more expansive ones depending on the quality and
size. These servos normally plug into your radio control receiver, but
today we will connect it to your PIC. </p>
+ <p>I will mostly be talking about RC servos, but you will also be able
to connect a RC speed controller since they use the same technology. These
speed controllers are made up of power MOS FETs to allow 12v at 50A+ to
control the speed of a motor via PWM.</p>
+ <image href="images/servo_rc_master_servo.jpg" width="210"
otherprops="clickable"/>
+ <image href="images/servo_rc_motor_speed_control.jpg" width="225"
otherprops="clickable"/>
<p>The only way to really know how something really works is to take
it apart! I found some gears, a potentiometer some electronics and a
motor. The servos gears are to give it the strength it needs to move
whatever it is you want to move in your project. The servo knows it's
position by reading a voltage off the potentiometer that gets turned by the
gears which of course gets turned by the motor. After a signal is given,
the servo will move to the correct location.</p>
<image href="images/servo_rc_master_disassembled.jpg" width="450"
otherprops="clickable"/>
<p>To control a servo, we need to send it a PWM (pulse width
modulation) signal. Thankfully it will all be taken care of by the Jallib
library I have created. A pulse will be sent every 20ms, and each pulse
will be a width between 0.5ms and 2.5ms. The pulse width will vary
depending on the position you have chosen. Servo pulse width required can
very depending on the servo manufacturer, therefore the library has been
created with some default values that you may change to get a full movement
from left to right.</p>
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