The program causes the motor to rotate in a pattern 0° – 90° – 180° – 0° and so on. In the main program, PORTB is set as an output port and all the three functions are called, separated by a delay of 2000ms between them. Similarly,a pulse of 1500ms is required for a rotation up to 90° and 2200ms for a180° angle. 800ms, so a delay of 800ms is introduced with the PORT pin RB0 set to high. That is, for 0° angle, the pulse width is approx. The delay duration for a particular angle is equivalent to the length of the pulse required for the motor to rotate up to thatcorresponding angle. Individual functions for angular rotation of the motor by 0°, 90° and 180° have been declared in the beginning of the code.In this tutorial, we have not used the actual Pulse Width Modulation feature of PIC16F877A to generate a pulse.Instead, the pulse has been created with the help of delays in the program. To control the working of a servo motor when interfaced with PIC16F877A microcontroller. The input to its control line determines the position demanded for the output shaft. Its angular rotation and final movement is dictated by position feedback. It provides angular precision, which means,unlike other electrical motors that keep on rotating until power is applied to them and stops only when the power is switched off, the servo motor rotates only to a certain degree or until it is required to and then the motor stops and waits for the next instruction to carry out further action.Servo motors are controlled with the help of servomechanism. What is servo motor?Ī servo motor is a special kind of motor that operates upon the given instructions. Lets start with basic introduction of servo motor, then I will move forwared to its circuit diagram and programming. Programming to control servo motor and hardware connections of servo motor with PIC16F877A microcontroller. However, as I am a novice, i am sure there is a more efficient way of writing the code.SERVO MOTOR interfacing with PIC16F877A MICROCONTROLLER,In this tutorial, you will learn the interfacing of a servo motor with PIC16F877A microcontroller. Below is my attempt at making a menu for the common 1602 LCD.
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