[PD] pduino and FSRs

nick burge tectp at telefonica.net
Fri Apr 11 21:17:38 CEST 2008


Thank you Hans, am I being unrealistic in  trying to have six analog inputs
active all at once? I know you said that was a lot of data, but I run a
fairly powerful laptop with a dual core Centrino processor, and Windows task
manager reports  only a modest demand on the cpu of around 30% when I have
the patch running and all inputs active, so it seems to be an error in
timing or syncronisation rather than simply overstressing the system that
causes this....I've taken the patch right down to the basic arduino-test
patch, but still the crashes occur when I activate more than 2 analog
inputs. I'll experiment with different baud rates, go back to a usb
connection rather than the xbee wireless system and keep trying to identify
the source of the problem. I'll get back to you if I learn anything new.
Below is the data produced by the event viewer in Windows in case it means
anything to you.
 
pd.exe	
			0.0.0.0	
			47148d16	
			pd.dll	
			0.0.0.0	
			47148d15	
			c0000005	
			00004e04	
			17ec	
			01c89bd26543018e	
 
Nick.

  _____  

From: Hans-Christoph Steiner [mailto:hans at eds.org] 
Sent: 11 April 2008 18:30
To: nick burge
Cc: Pd List
Subject: Re: [PD] pduino and FSRs



Let's keep this on the list since it could be generally useful.

In order to get to the next step, you should try to isolate the problem, to
see where the crash is actually happening. Otherwise, there are far too many
possibilities for me to try guessing. Ideally, you could make a simple patch
that reproduces the crash.

.hc

On Apr 11, 2008, at 3:01 AM, nick burge wrote:


Firmata, Pduino and xbees. are all set to communicate at 19200 baud.
Nick 

  _____  

From: Hans-Christoph Steiner [mailto:hans at eds.org] 
Sent: 10 April 2008 23:57
To: nick burge
Cc: Pd List
Subject: Re: [PD] pduino and FSRs





What baud are you running each at? IIRC, the XBee needs a strange value.


.hc
On Apr 10, 2008, at 5:52 PM, nick burge wrote:


I wish I knew. I'm loading the arduino-test patch with no other objects or
abstractions so as to eliminate other suspects. Still PD crashes when I
enable more than 2 analogIns.
Would it help to speed up or slow down the xbee connection?

  _____  

From: Hans-Christoph Steiner [mailto:hans at eds.org] 
Sent: 10 April 2008 23:12
To: nick burge
Cc: Pd List
Subject: Re: [PD] pduino and FSRs



The code and the electrics are quite separate. If the electrics work with
one firmware, then they'll work with another. The question is, what is the
"it" that grinds to a halt.

.hc

On Apr 10, 2008, at 4:17 PM, nick burge wrote:


Yes, I've got the latest version....maybe a silly question...but could it be
that Pduino is optimised for sensors working on a supply of 5v. because the
phidget voltage dividers i've got my FSRs attached to come with a
potentiometer that alters the resistance of the circuit...with pduino i can
only activate 2 at a time before it all grinds to a halt...on arduino2PD i
can activate all six without any problem. Strange. 
Nick.

  _____  

From: Hans-Christoph Steiner [mailto:hans at eds.org] 
Sent: 10 April 2008 21:51
To: nick burge
Cc: Pd List
Subject: Re: [PD] pduino and FSRs



I've never run on Vista before, so I can't say much about that. I have run
on Debian, Ubuntu, and Mac OS X. It shouldn't matter what is generating the
data on the arduino, the messages coming to Pd via the serial port should be
all the same. 

Are you using the latest version:
http://at.or.at/hans/pd/Pduino-0.3.1.zip

.hc

On Apr 10, 2008, at 12:57 PM, nick burge wrote:


Hello Hans-Christoph, I am using PD 0.39.3 extended. on a windows vista
system. Its PD that crashes, or "stops working" as Vista so nicely puts it,
when I connect the FSRs.
I have arduino connecting via wireless xbees at 19200 baud.
I also use an infra red distance sensor that gives no problem.
I've been routing the data from the FSRs through the autoscale object.
Maybe I should find a way to reduce the amount of data being sampled...every
40ms for example? How would I do that?
Nick.

  _____  

From: Hans-Christoph Steiner [mailto:hans at eds.org] 
Sent: 10 April 2008 17:25
To: nick burge
Cc: Pd List
Subject: Re: [PD] pduino and FSRs



Which program crashes? Which version are you using? You will get a lot of
data, from 6 sensors, Pduino/Firmata will read them all every 20ms. I have
never seen a crash using [arduino], except when I unplug the arduino when Pd
is connected to it, so I suspect the problem lies elsewhere. 

.hc

On Apr 10, 2008, at 11:16 AM, nick burge wrote:


I have a little problem using Pduino and some force sensing resistors that I
am using in conjunction with phidget voltage dividers....they seem to crash
the program as soon as I activate more than 1 at a time..... 
Should I be applying some sort of filter to the data stream?
Arduino2PD seems more robust, allowing me to activate all 6 analog inputs at
once.

Nick Burge.
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