Hello friends! Today we will control a servo motor with the PIC16F877A and observe its movement in Proteus ISIS. We will begin with the three servo connections, understand the command waveform, and then write a small program that selects positions using two pushbuttons. In the previous tutorials, we explored DC motor direction control and stepper motor sequencing . A positional hobby servo is different because the motor, gearbox, position sensor, and controller are already assembled together. Our PIC requests a position rather than switching the motor windings itself. We will keep the original PIC and button arrangement, but use a repeated control pulse with a sensible frame period. Along the way, we will separate what the simulated angle display tells us from what a physical servo must be ...