servo motor - Electronic Circuits Projects Diagrams Free

malik_shoaib · 19th June 2009, 01:00 PM

which type receive servo motor signal

Chippie · 19th June 2009, 01:11 PM

I dont understand your statement but....

The normal signal for driving R/C servos is a pulse with a width of 1 to 2 mS with a frame rate of 50 mS...

The servo is normally centred at 1.5mS

Mike, K8LH · 26th June 2009, 12:41 PM

Forgive me but isn't the "frame rate" or "period" normally 20 msecs (sometimes as low as 3 or 4 msecs for newer generation digital servos)?

Chippie · 26th June 2009, 02:48 PM

Doh... yes my mistake... Must have been having a Homer moment

I was thinking 50 Hz which is 20msecs...

Thanks for pointing that out...(where's the 'embarrassed' smiley? )

Mr RB · 27th June 2009, 07:42 AM

It's specced at a MAX of 20mS. Actually you can go longer as the brain in the servo is a sample and hold based on the pulse HI period only. I've used up to 40mS with no problems. If you go much longer than that the servo brain goes into low power "limp" mode and powers down its hbridge.

You can go LESS than 20mS with no probs, I made a 4 servo system that used 2.5mS events to sequence the 4 servos so the total period for any 1 servo was 10mS.

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19th June 2009, 01:00 PM	#1
malik_shoaib	servo motor which type receive servo motor signal

19th June 2009, 01:11 PM	#2
Chippie	I dont understand your statement but.... The normal signal for driving R/C servos is a pulse with a width of 1 to 2 mS with a frame rate of 50 mS... The servo is normally centred at 1.5mS __________________ Eccentric millionaire financed by 'er indoors

26th June 2009, 12:41 PM	#3
Mike, K8LH	Forgive me but isn't the "frame rate" or "period" normally 20 msecs (sometimes as low as 3 or 4 msecs for newer generation digital servos)?

26th June 2009, 02:48 PM	#4
Chippie	Doh... yes my mistake... Must have been having a Homer moment I was thinking 50 Hz which is 20msecs... Thanks for pointing that out...(where's the 'embarrassed' smiley? ) __________________ Eccentric millionaire financed by 'er indoors

27th June 2009, 07:42 AM	#5
Mr RB	It's specced at a MAX of 20mS. Actually you can go longer as the brain in the servo is a sample and hold based on the pulse HI period only. I've used up to 40mS with no problems. If you go much longer than that the servo brain goes into low power "limp" mode and powers down its hbridge. You can go LESS than 20mS with no probs, I made a 4 servo system that used 2.5mS events to sequence the 4 servos so the total period for any 1 servo was 10mS.