Use a voltmeter and keep an eye on the supply voltage level as the  =

circuit and servo are running.  Depending upon how much torque you're  =

asking from the servo, it can demand a lot of current -- which in  =

turn drops the overall voltage level.  I don't know where the brown- =

out voltage level(s) is(are) on the 16f627, but your chip will reset  =

if you have it enabled and the voltage drops below that point.

If you are doing a lot with the motor, you may be better off with  =

separate power supplies for the PIC and motor.  However, I don't know  =

how tolerant RC servos are with respect to the signal input voltage  =

-- if it's substantially different than the power you may need to  =

pass the signal through a transistor to place the pulses at the  =

servos power voltage.

Matt

=96=96=96=96=96=96=96=96=96=96=96=96=96=96=96=96=96=96=96=96=96=96=96=96=96

Matt Bauman
Research Technician, Miller Lab
Physiology, Ward 5-150
Northwestern University



On Mar 19, 2007, at 11:03 AM, funkygreendogs wrote:

>
> looks like you were right about the diode, as soon as i connected  =

> one to the
> powersupply it got rid of those jitters so it runs nice and  =

> smoothly now.
> Just one thing, i notice the led stops flashing or flashes at a slower
> frequency than normal while the servo is moving, does this mean i  =

> cant move
> two servos at the same time? or cant i do anything else with the  =

> pic while
> the servo is moving?
> thanks again
>
> Jason
>
>
> Jinx wrote:
>>
>>> Thanks for the code it seems like that was just the ticket :)
>>
>> word
>>
>>> I have switched back to a single power-supply again and scrapped
>>> the potential dividers from your advice, not sure whats causing it
>>> really,
>>> any ideas??
>>
>> I wonder if noise is getting to Mclr ? Is it filtered in any way,  =

>> eg a
>> small cap, like 10n, 100n, to ground, or just pulled up ? Any other
>> active inputs that could be getting noise and interfering with code ?
>>
>> -- =

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>>
>
> -- =

> View this message in context: http://www.nabble.com/pic-servo-power- =

> supply-problems-16f627-tf3424352.html#a9554925
> Sent from the PIC - [PIC] mailing list archive at Nabble.com.
>
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> http://www.piclist.com PIC/SX FAQ & list archive
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