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Same servo and same PWM but diff angles

 
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Power_user_EX



Joined: 03 Nov 2009
Posts: 1

PostPosted: Thu Nov 05, 2009 6:16 pm    Post subject: Same servo and same PWM but diff angles Reply with quote

Hi guys , i have just received my 20 Futaba S3003 servos for my hexapod from ebay hong-kong. But i doubt if its original coz when i give the same PWM to all the servos some of them run out of sync , which is that a few (2 to 4) servos will never come to the same position like the rest. So what could be the prob with some of these servos. Confused

Also the PWM range is sort-of wiered.

for 3ms it comes to 0 degs ,
for 9 ms it comes to 90 degs
and for 1.6 to 1.7 ms is comes to 180 degs.

So , could the potentiometers be the culprit ? Can i make more accurate by changing the Pots ? Question
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mog123



Joined: 07 Jun 2009
Posts: 12
Location: Poland

PostPosted: Tue Dec 08, 2009 11:29 pm    Post subject: Reply with quote

A standard servo signal ranges from 1,0 to 2,0 where 1,5 is center position.
Most producers dont use the standard signalling but their own, i.e. a TowerPro servo can go from 0,5 to 2,3 as I recall.
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