Hello friends! Today we will control a hobby servo from a 555 timer in Proteus ISIS. We will generate a repeating position-command pulse, measure its width, and see how changing that width changes the simulated shaft position. This project is a useful way to connect timer theory with motion control. The servo has its own internal motor driver and feedback system; our 555 supplies a command signal, not the motor's operating current. The command pulse must have suitable voltage levels, timing and repetition. The original diagrams and download are preserved below. We will correct two important points from the older explanation: a servo does not universally rotate from −180 to +180 degrees, and the 555's threshold is a fraction of its supply rather than a fixed 5 V value. Figure: Historical se ...