[PD] controlling relays from parport

derek holzer derek at x-i.net
Tue Dec 2 13:52:49 CET 2003

hi IOhannes,

what I would like to do is control each pin independently, so that I can 
send on/off signals to several different relays. Maybe I am a bit lazy 
[or short on time ;-) ], but testing the data sent to each pin in order 
to create a word that sends to all pins in order to change the state of 
one pin seems like going in circles. Perhaps you have a demo patch which 
makes this cleaner than what I suggest here?


IOhannes m zmoelnig wrote:
> derek holzer wrote:
>> hi all,
>> I have looked at Norbert Math and Iohannes Zmoelnig's 'lp' object, but 
>> I see already that it is for writing characters, not sending simple 
>> binary signals. Is there another object which might work, or a way to 
>> hack 'lp' to do this?
> btw, i have written and used my 'lp' exactly for this purpose: to 
> control relays.
> what is it, that you cannot do with 'lp' and a bit of knowledge of 
> binary numbers, which you could do with "simple binary signals" ?
> most "mechanic" relays will be too slow for signals anyhow.
> mfg.a.dr
> IOhannes
>> Thanks,
>> D.

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