A servo operates with an input signal of 1 to 2 ms that is repeated every 20 ms. A signal of 1 ms means that the servo is rotated completely in one direction, 1.5 ms means the centre position and at 2 ms the servo rotates completely to the other direction. Servos normally rotate through an angle of about 270 degrees, but here we want to it to turn all the way around. We therefore have to modify the servo.rnThe modification in principle comprises three things: removing the end-stop so that the mechanics can rotate through a full 360 degrees, taking out the potentiometer and replacing it with two fixed resistors so that the electronics in the servo thinks that the potentiometer is always in the centre position.
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