>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 14 January 2006 15:28
>To: Microcontroller discussion list - Public.
>Subject: Re: [PIC] Detect PWM from an RC Servo
>
>
>Padu wrote:
>> Thanks for the example Bob, I don't know why but I had in my 
>mind that 
>> the CCP module didn't have enough resolution for this type of signal.
>
>The CCP module can capture edges to instruction clock 
>resolution.  With a 18F the instruction period is 100nS, 
>meaning it can resolve the 1-2mS pulse width to 1 part in 
>5000.  Other sources of error probably overshadow that by a 
>large margin.

Cheap RC servos can not repeatably resolve even 1 part in 256 (i.e. 8 bit) IME due to gear backlash and slop in bearings etc.

Regards

Mike

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