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vp
08-05-2008, 08:05 AM
Hi there,

can i run any kind of servo motor witht he help of board of education rev b or i need to buy only parallax servo motors

Thx
Vishal Patel

Mike Green
08-05-2008, 08:17 AM
Any servo motor or motor controller that looks like a servo to the microcontroller should work. There's no rigid standard for what makes a servo, but the general notion is that there's a +5V logic control pulse that's repeated at least 50 times a second. The width of the control pulse sets the servo motor's position with 1ms representing one end of the range and 2ms representing the other end of the range. Some servos may accept pulses as short at 0.5ms and as long as 2.5ms. Some servos (continuous motion servos) use the control pulse to set speed and direction instead of position with the mid-range pulse (1.5ms) representing stop and shorter pulses representing motion in one direction and longer pulses representing motion in the other direction.

Most servos will respond to pulses using +3.3V logic (like from the Propeller).