[PD] digital write problem in Pduino

Martin Peach martin.peach at sympatico.ca
Wed Oct 8 17:03:53 CEST 2008

Maybe with 8 or more LEDs you are pulling too much current and the board is 
resetting or doing flakey things because its power supply is glitching.
Especially if you are powering it from USB.


Derek Holzer wrote:
>I'm using the new Pduino 0.4beta2 and Firmata0.4beta3 with Pd-Extended
>0.39 and 0.40 and an Arduino NG (Atmega16 IC) to control 10 separate
>LEDs via the Digital Write pins 2-12. Each has the possibility to blink
>at a different speed. What I've discovered is that if I have more than 6
>or 7 LEDs blinking at different speeds, there is cross-talk between the
>channels causing the LEDs to blink at wrong intervals (but not in
>unison), including the onboard one on the Arduino board on Pin 13 which
>I'm not even sending messages to!
>I don't believe it is an electrical problem, as the wiring is quite
>simple and I decoupled the outputs to the LEDs after the problem first
>occurred. In fact, the problem persists even when I remove any and all
>of my own electronics from the circuit!
>The blink interval is something in the area of 200-500 miliseconds,
>certainly slow enough for the comport. Could it be trouble with some of
>the objects in the [arduino] abstraction?
>Any and all suggestions appreciated, as this project needs to go out the
>door tomorrow morning!
>derek holzer ::: http://www.umatic.nl ::: 
>---Oblique Strategy # 95:
>"Is something missing?"
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