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| Micro Controllers Discuss all aspects of micro controllers - building them, coding them, etc. All controllers are welcome - PIC, BASIC, Z8 Encore!, etc. |
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9th May 2008, 06:53 PM
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| Experienced Member   |  Multiple PWMs, how? I've seen various projects that have programmed a PIC to have multiple independent(maybe?) PWM outputs, even thought the chips only have one in hardware (did I see one with none?). Does anyone know how this is done? |
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9th May 2008, 06:55 PM
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| Experienced Member  | How many do you need? |
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9th May 2008, 06:59 PM
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| Experienced Member | Erch... I dunno... At least 3 for an RGB idea I have (moodlight-thing), but the more the merrier. BTW, that was hella-fast! |
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9th May 2008, 07:02 PM
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| Experienced Member | For LEDs a simple software PWM is plenty. |
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9th May 2008, 07:04 PM
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| Experienced Member | Yarh, but how? Does it have nothing to do with the hardware PWM then? And doesn't it tie up all the processing time? |
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9th May 2008, 07:06 PM
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| Experienced Member | It can be all interrupt driven. Lots of code samples on the net I'm sure. |
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9th May 2008, 07:09 PM
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| Experienced Member | AAAHH!! I find it, I find it! No worry.  There is a technical document from Microchip themselves. AN1074 - Software PWM Generation for LED Dimming and RGB Color Applications. |
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9th May 2008, 07:09 PM
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| Experienced Member | Looks like I answered my own question... |
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9th May 2008, 07:32 PM
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| Experienced Member | The App notes are really handy. |
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9th May 2008, 08:14 PM
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| Moderator  | If you want several hardware PWM's look at one of my favorites the 18F1330. It also has a PLL that works with the internal 8MHz clock that bumps it up to 32MHz.
__________________  search engine for electronic partsJunebug USB PIC programmer kit., USB Bit Wacker, Homepage The 15 Minute Printed Circuit Board! (+drill time) |
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