Re: [PD] digital write problem in Pduino

8 Oct 2008

      I'll take a look and see what I can find.  You could also write an

Arduino firmware using Firmata as a library, then just support the

things you need to have working.  Perhaps the timing of the analogIns

or something like that are interfering.
Look at the examples in Arduino, like SimpleDigitalFirmata.  They are

in File -> Sketchbook -> examples -> Library-Firmata
.hc
On Oct 8, 2008, at 2:07 PM, Derek Holzer wrote:
...
Problem remains the same after upgrade. Looks like I or probably a

friend have to write some custom firmware for this project before

tomorrow.
D.
Hans-Christoph Steiner wrote:
...
There were bugs in that version.  They have been fixed in the

version of Firmata that is included in Arduino 0012.  Burn that

version to your Arduino and use the regular Pduino pd patches.

Once I get a spare moment, I'll update the Pduino .zip on my page.
.hc
On Oct 8, 2008, at 11:59 AM, Derek Holzer wrote:
...
Attached is a diagnostic patch which demonstrates the problem.

This problem can be demonstrated using only the Arduino board

with a single LED (plus current reducing resistor of 1.5K)

connected from pin 2 to GND.
At 7 simultaneous [metro]s, the on-board LED at Pin 13 starts to

blink, even when it has not been sent any messages. After that, a

single LED on Pin 2 will start to blink sporadically, especially

with more randomized [metro] intervals. If the [metro]

controlling the LED on Pin 2 is switched off, it will continue to

blink if other [metro]s are running.
Clearly this is a case of message collisions, even though the

[comport] object does not report any TX-OVERRUNS.
I'm not too skilled with writing code for the Arduino, so I have

no way of running something standalone right now to see if it can

be isolated from the board.
I'd really like to have a solution or workaround to this problem,

as it's quite an unexpected bug!!!!
thanks + best!
Derek
Charles Henry wrote:
...
On Wed, Oct 8, 2008 at 9:38 AM, Derek Holzer derek@umatic.nl

wrote:
...
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?
Hi, Derek,
One thought that occurred to me: it takes around 16-20 ms to send a
message to the arduino and recieve a message back (which has to do
with the FTDI chip).  This is a round-trip time--I'm not sure

what the
delay time is like for data traffic going in one way.  Perhaps

those
delays are adding up, when you've got 10 separate LEDs to control?
Have you considered making a test program on the arduino to

blink the
LEDs at different rates and see if the problem persists?  That

would
isolate the communications from the actions performed.
Chuck
-- 
derek holzer ::: http://www.umatic.nl ::: http://blog.myspace.com/ 
macumbista
---Oblique Strategy # 70:
"Feedback recordings into an acoustic situation"
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even
when no message is sent. More metros will cause single LED to blink
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is switched off , it will still blink when other metros run.;
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------- There is no way to peace, peace is the way.       -A.J. Muste
-- 
derek holzer ::: http://www.umatic.nl ::: http://blog.myspace.com/ 
macumbista
---Oblique Strategy # 113:
"Make a blank valuable by putting it in an exquisite frame"

'You people have such restrictive dress for women,’ she said,

hobbling away in three inch heels and panty hose to finish out

another pink-collar temp pool day.  - “Hijab Scene #2", by Mohja Kahf

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Re: [PD] digital write problem in Pduino