I'd suggest using a single, fast timer interrupt to do  the PWM, and
use a PIC with a hardware uart in polled mode for comms.=20


On Sat, 16 Nov 2002 10:34:18 -0600, you wrote:

>Have a look at http://www.al-williams.com/pak5.htm -- a lot of these are
>used in commercial lighting displays.
>
>Other than that, you might consider writing your own PWM in an interrupt
>timer routine. However, 30 might be a bit much depending on the
>frequency you want.
>
>Regards,
>
>Al Williams
>AWC
>* Easy RS-232 Prototyping
>http://www.al-williams.com/awce/rs1.htm
>
>> -----Original Message-----
>> From: pic microcontroller discussion list
>> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Josh Koffman
>> Sent: Thursday, November 14, 2002 4:47 PM
>> To: PICLIST@MITVMA.MIT.EDU
>> Subject: [PIC]: Many channels of PWM
>>
>>
>> Hi all. I seem to be in a creative mood lately. I came up
>> with an odd idea for a festive holiday light type item.
>> Problem is I want 15-30 channels of PWM. I really like the
>> PIC's PWM module for its simplicity. However, 15 16f628s or 8
>> 16f870s seems a bit much. I have seen Scott Dattalo's code
>> for 8 concurrent streams. However it's all software, and I'm
>> worried that running a routine for dealing with serial comms
>> will throw off the timing. Is there a commercially available
>> chip that does multiple PWMs in one package? Or, has anyone
>> else dealt with this?
>>
>> Thanks,
>> Josh
>>
>> --
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>> something completely foolproof is to underestimate the
>> ingenuity of complete fools.
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>>
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