[PD] Comport issue: two digits problem

Luca Caridà lineacurva at gmail.com
Fri Dec 11 01:09:24 CET 2009

Thank you very much martin,

Adding a "print" to [comport] I see the list of 12 ascii values.

Having a single [0...255] number from Arduino would be easier and  
probably the best way to go. But I also wish to understand if pure  
data can make the job.

For that I used a [list prepend] [list append] to obtain a list of my  
two-digits numbers.
Putting a [print] after [list append] allows me to see the inline list:
print: 48 49 48 52 52 53 69 56 66 56

And that leads me to a more general question: could I compare a list  
to another list and obtain a BANG as they match?. At first I was  
thinking of using [select], but I don't know if it can manage lists  
and how.

Il giorno 10/dic/09, alle ore 19:36, <martin.peach at sympatico.ca>  
<martin.peach at sympatico.ca> ha scritto:

> lineacurva wrote:
> > Hi guys,
> >
> > I'm working on my first RFID project, involving Arduino and Pure
> > Data. I use Innovation Id-20 reader and Arduino 2009. I'm stuck in a
> > problem with "comport".
> >
> > As I put a transponder near the reader, in Arduino serial monitor I
> > can see a number like: 495211712056
> >
> > But in the little patch I attach here, comport reads: 53
> >
> > This is a problem since more than one transponder give me a "53"
> > feedback (but a different 12 digits number in Arduino monitor).
> >
> 53 is the ASCII value of the character '5'. Probably if you add a  
> [print] to the [comport] output you would get a list of 12 ASCII  
> values for each sample.
> In Pd you need to accumulate the list of incoming ASCII codes,  
> subtract 48 (ASCII '0') from each, and route them accordingly. A 12- 
> digit number won't display correctly as a float. Probably it's  
> easier in Arduino to make your numbers ints on [0..255] and send  
> them as BYTE. Then you get one number per sample and don't need to  
> handle lists.
> Martin

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