PWM information for digital servos
05-07-2002, 05:38 PM
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PWM information for digital servos
Hi,
I want to use JR digital servos to control a robotic vision system. I need to now information on the Pulse Width Modulation(PWM) that drives the servos such as duty cycle, pulse width for different movements,... to drive my servos.
Does anyone know where I can get this information? Also, can anyone propose a good method to implement a 4 parallel channel PWM?
Thanks alot
Joe
I want to use JR digital servos to control a robotic vision system. I need to now information on the Pulse Width Modulation(PWM) that drives the servos such as duty cycle, pulse width for different movements,... to drive my servos.
Does anyone know where I can get this information? Also, can anyone propose a good method to implement a 4 parallel channel PWM?
Thanks alot
Joe
05-07-2002, 06:20 PM
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PWM information for digital servos
The pulse width is between 1 and 2 ms, 1.5 ms being the nominal centre position. The pulse rate is typically 50 Hz. Digital servos don't care too much about the pulse rate since they don't use it to directly control power to the motor. So, for digitals you can increase the pulse rate if you need faster response times. Up to 150 Hz should be good.
There are schematics available for PPM encoding and decoding. These are usually based on a few 4000 series CMOS ICs. I don't have any URL handy, sorry, but they shouldn't be too hard to turn up with the keywords above.
There are schematics available for PPM encoding and decoding. These are usually based on a few 4000 series CMOS ICs. I don't have any URL handy, sorry, but they shouldn't be too hard to turn up with the keywords above.
