Microcontroller PIC16F877 Video 48 How to Interface Stepper Motor Using Mikro C For PIC

Introduction to Stepper Motors

A stepper motor is a widely used device that translates electrical pulses into mechanical movement. The most common stepper motor has four stator winding that are paired with a center-tapped common. This type of stepper motor is called unipolar stepper motor.

Types of stepper motors
There are mainly three types of stepper motors based on construction, which are:
1. Variable reluctance stepper motor:  
They have iron core rotor which is attracted towards the stator poles and provide movement by minimum reluctance between stator and rotor.
2. Permanent magnet stepper motor:  
They have permanent magnet rotor and they are repelled or attracted towards the stator according to pulses applied.
3. Hybrid synchronous stepper motor: 
They are combination of Variable reluctance and permanent magnet stepper motor

Stepper Motor Construction

Like all motors, the stepper motors also have a stator and a rotor, but unlike a normal DC motor, the stator consists of individual sets of coils. In a stepper motor, the rotor consists of a permanent magnet that will be attracted by a set of the coil in the stator. The below diagram shows a stepper motor.


Project: How to Interface Stepper Motor

In this project, we will connect unipolar stepper motor with PIC16F877 microcontroller, and we are using ULN 2004 darlington pair array because microcontroller cannot provide enough current to operate the stepper motor.

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