[PD] Pduino and the AD5206 digital potentiometer

[Martin Peach]

A lot of chips use SPI (DACs, EEPROMs, etc.). It would be good to have a 
function that sends/receives SPI bytes, but it's complicated because there 
are 4 different modes based on the clock polarity and the clock active edge. 
Also you would need to specify which three pins (data in, data out and 
clock) to use. I think it would be easier to just program the Arduino to do 
SPI (there's already a library for it) and use [comport] to transfer data 
to/from pd. That is, have a generic way of sending data between pd and 
arduino, but program the arduino for the specific hardware. It might be 
possible to use OSC over the serial connection, for instance.

Martin


Hans-Christoph Steiner wrote:
>
>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.
>>>_______________________________________________
>>>PD-list at iem.at mailing list
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>>
>>
>>
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>>
>>
>>
>>
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