hi,
great news you're not stuck !
try to find logic-level P-channel mosfets, preferably TTL ones.
SPP15P10PL at digikey looks like a good match.
Enjoy,
Charles
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On Wed, Aug 7, 2013 at 12:05 AM, Epic Jefferson jeffreyconcepc...@gmail.com
wrote:
Hey Charles,
it seems like this might work. i got some pnp transistors and built the
circuit from julianvogels site.
The only problem is that the LED on the test circuit barely lit up. I
think it's because
-mechanical piano (player piano) - Arduino,
Solenoid Issue
On Wed, Aug 7, 2013 at 12:05 AM, Epic Jefferson jeffreyconcepc...@gmail.com
wrote:
Hey Charles,
it seems like this might work. i got some pnp transistors and built the
circuit from julianvogels site.
The only problem
://sharktracks.co.uk/
From: Charles Z Henry czhe...@gmail.com
To: Epic Jefferson jeffreyconcepc...@gmail.com
Cc: pd-list pd-list@iem.at
Sent: Wednesday, 7 August 2013, 20:41
Subject: Re: [PD] electro-mechanical piano (player piano) - Arduino,
Solenoid Issue
On Wed, Aug 7, 2013 at 12:05 AM, Epic
2013, 0:26
Subject: Re: [PD] electro-mechanical piano (player piano) - Arduino, Solenoid
Issue
note that you have to subtract the voltage drop over the LED, hence it's R =
(Vsupply - Vled)/ Iled, e.g. (5-2)/0.02 = 150 Ohm
/Mikael
On 8 Aug 2013, at 00:19, Ed Kelly morph_2...@yahoo.co.uk
jeffreyconcepc...@gmail.com; pd-list pd-list@iem.at
*Sent:* Thursday, 8 August 2013, 0:26
*Subject:* Re: [PD] electro-mechanical piano (player piano) -
Arduino, Solenoid Issue
note that you have to subtract the voltage drop over the LED, hence
it's R = (Vsupply - Vled)/ Iled, e.g. (5-2
Hi,
You're not doomed !
There are two ways to solve your problem:
The proper one is to use PNP transistors or P-channel mosfets (remember
I already told you about that ? :))
See this document, you can find the wiring at the end:
Hey guys,
updating on this project. I got the pwm shields and i've hit a wall. The
driver circuit I'm using to control the solenoids via arduino is this one
from instructables
(linkhttp://www.instructables.com/id/Controlling-solenoids-with-arduino/))
and
it uses a single pin to control the pwm
Hi,
Epic Jefferson wrote:
i've been able to control solenoid velocity with pwm via pd, this is also
how Winfried does it. Also, motors are way too loud, as I told Olivier.
That's good to hear ! How much accurate is this ? Underpowering a hub
magnet that has a lot of jitter in its movement [1]
Alexandros and Roman:
Thanks, i'll check both of your suggestions. I'll let you know how it goes.
I also just ordered a Practical Maker PWM shield for arduino UNO. 1 shield
gives you 32 pwm pins and they're stackable, up to 6 without the need for
an external power supply.
Epic Jefferson wrote:
Alexandros and Roman:
Thanks, i'll check both of your suggestions. I'll let you know how it goes.
I also just ordered a Practical Maker PWM shield for arduino UNO. 1 shield
gives you 32 pwm pins and they're stackable, up to 6 without the need for
an external power
Charles:
Yeah, we're building custom drivers for the solenoids and we built a 30v
power supply as well.
On Thu, Jun 27, 2013 at 4:43 PM, Charles Goyard c...@fsck.fr wrote:
Epic Jefferson wrote:
Alexandros and Roman:
Thanks, i'll check both of your suggestions. I'll let you know how it
Roman, I tested your [solenoiduino] patch and it doesn't quite do what i
expected. But i think i can expand on this idea.
So, right now you send the pin number and the amount of ms you want it to
be HIGH, but what if you don't know how long it will be? for instance a
live performance situation.
Hi,
this is largely off-topic, but there you go :)
Epic Jefferson wrote:
I've had progress building an Arduino-powered solenoid system for a
controlling a piano's hammer mechanism (removing the keys) via pd.
So far I've found the solenoid I want to use.
With solenoids you will not get
On 2013-06-26 03:51, Charles Goyard wrote:
Hi,
this is largely off-topic, but there you go :)
Epic Jefferson wrote:
I've had progress building an Arduino-powered solenoid system for a
controlling a piano's hammer mechanism (removing the keys) via pd.
So far I've found the solenoid I want to
Charles Z Henry batinste:
I need the project to be pd controlled, i could try multiplexing but i
haven't found info yet on how to control multiplexed pins via pd.
Peter Venus:
i've been in contact with Winfried, and was about to purchase one of his
older systems but haven't heard from him in a
That is one of the many cases where my advice would be : don't use
firmata/pduino. Program the arduino for real. Use a basic custom
protocol over the serial link, and talk to the arduino with [comport].
You'd spend much more time trying to get it to work with firmata/pduino
than programming
Dunno if it helps, but I messed around with multiplexing and arduino some
time ago and finally got it to work. You can check the arduino sketch and
pd patch here
http://puredata.hurleur.com/sujet-8867-arduino-multiplexers-solved
This is only for reading multiplexed pins though, not for writing,
Are you sure you need PWM pins? You'll definitely be paying for more
*duinos if you are just using those. If I were you, I'd think of another
way to deliver a variable impulse to the hammers.
Chuck
On Tue, Jun 25, 2013 at 3:43 PM, Epic Jefferson jeffreyconcepc...@gmail.com
wrote:
Hey guys,
maybe this could help you.
http://algo.mur.at/projects/microcontroller
this is developed by winfried ritsch, who realised really fast
responding automated pianos with these.
peter
Am 25.06.13 22:53, schrieb Charles Z Henry:
Are you sure you need PWM pins? You'll definitely be paying for
Your might want to take a look at the TLC 5940. It's a led-driving chip
with 16 pwm outputs. Chips are daisy-chainable, and there is an arduino
library.
https://www.sparkfun.com/products/10136
On 25/06/2013 22:53, Charles Z Henry wrote:
Are you sure you need PWM pins? You'll definitely be
Hi...
It's not really the subject because we didn't use Pd for the this
version...
But we've done a piano player with 48 servo engine (HS-422 from Hitec)
controlled by I2C with a 3 PCA9685 and a Raspberry Pi.
This one from Adafruit ( http://www.adafruit.com/products/815 ) can be
used with an
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