[PD] Pduino and the AD5206 digital potentiometer

[nick burge]

With some trial and error I've managed to edit the firmata firmware to
control the chip as attached here. On Arduino you can only use digital pins
10,11,12 and 13 for  SPI... slave select, data out, data in and spiclock.
Since Firmata uses pin 13 to flash its version number there was a bit of
jostling to sort out, removing that command from the void setup section,
because otherwise it continues to print the version number constantly when
you go into the loop.
So now I have the AD5206 tutorial patch running within Firmata, which is
fun. It would be more fun and potentially creative however to have the
commands sent by PD...is that very difficult to do? Any clues anybody?
Nick

  _____  

From: Hans-Christoph Steiner [mailto:hans at eds.org] 
Sent: 05 March 2008 16:50
To: nick burge
Cc: Pd List
Subject: Re: [PD] Pduino and the AD5206 digital potentiometer



I am unlikely to write software for that chip unless I have a use for it.
But a firmware supporting it sounds useful. Firmata is an Arduino library,
so the easiest route would probably make a dedicated firmware for that chip
then use the Firmata to handle the communications.

.hc

On Mar 5, 2008, at 4:43 AM, nick burge wrote:


I got my AD206 chip as a free sample from analog devices 
http://www.analog.com/commerce/index.html
It would be great to have support within Firmata for SPI - (serial
peripheral interface) allowing control over this digital potentiometer or
other devices and sensors that work with that protocol when connected to an
arduino. 
Could it possibly work to simply copy sections of the code from the arduino
tutorial into the firmata firmware , first the definitions, then the void
setup section and then the write_pot(0,0) command to control the device into
the loop section.? As you can tell I have little idea how to do this.
Nick.


  _____  

From: Hans-Christoph Steiner [mailto:hans at eds.org] 
Sent: 04 March 2008 14:39
To: nick burge
Cc: 'Pd List'
Subject: Re: [PD] Pduino and the AD5206 digital potentiometer



It would be possible to add support to Firmata for this, but it's not
currently there. I don't have any of these chips, any volunteers? Patches
welcome :D

.hc

On Feb 26, 2008, at 8:54 AM, nick burge wrote:


Dear PD list. I would like to be able to control the AD5206 chip (a 6
channel digital potentiometer) from within the Pduino object written by
Hans-Christoph Steiner. The idea comes from one of the tutorial exercises in
the C++ arduino program.
http://www.arduino.cc/en/Tutorial/SPIDigitalPot
Is this relatively simple to do, or simply impossible? The aim in the long
run is to be able to be able to calibrate 6 force sensors remotely using the
digital potentiometers for an art installation project.
I have got the above mentioned tutorial project up and running succesfully
using the arduino program, and I am also able to get Pduino communicating
with the arduino quite happily on my Windows Vista system, but I would
imagine to have control over the the digital potentiometer device from
within PD would require a revision to the Firmata firmware would it not? I
would be most grateful for a clue.

thank you for your attention, sincerely, Nick Burge.
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