L293d unipolar stepper motor driver circuit

Next, we create an instance of the stepper library. In setup section of code, we set the speed of stepper motor by calling setSpeed function and initialize the serial communication. In loop section of code, we simply call step function which turns the motor a specific number of steps at a speed determined by setSpeed function.

Passing a negative number to this function reverses the spinning direction of motor. One of the easiest and Note that we will not be using the common center connection Red in this experiment. The diagram below shows the pin out of this motor driver.

It is connected with the Arduino 5V. VCC2: is the power supply for the H-Bridge circuits for running the motors and is in the range 4. GND: is the common ground and heat sink. This is where the DC motors having voltages between 4. However the speed of rotation is better controlled using PWM signals. The direction of rotation is determined by the logic on these pins.

PWM enables us to control the voltage applied to the motor in form of square wave pulses with a certain frequency. The voltage applied to the motor determines the speed of rotation of the motor by varying the width of this square wave called a duty cycle.

The duty cycle is given in percentage and the higher the duty cycle, the higher the voltage across the motor which also increases the speed of rotation. Driving a bipolar stepper motor with the LD is very similar to driving a unipolar stepper motor. The pulse sequence is the same. The only difference between driving a unipolar stepper motor and driving a bipolar stepper motor is that there is an extra wire in a unipolar stepper motor you have to hook up. Question 3 years ago on Step 4.

Your video was exactly what I was looking for Simple to follow. Excellent, I'm following. Reply 5 years ago. More by the author:. In this tutorial you will learn how to control a stepper motor using your LD motor control chip Stepper motors fall somewhere in between a regular DC motor and a servo motor. Bipolar Stepper Motor Driving a bipolar stepper motor with the LD is very similar to driving a unipolar stepper motor.

Get the Code. Connect 5V from Arduino with pin8 and pin These will power up both the motor and the driver IC. This will ensure that the stepper motor stays enabled. Connect all the common grounds together. Connect 5V from Arduino with pin8. This will power up the driver IC. Connect positive terminal of 12V power supply with pin8 and negative terminal with common ground.

A new file will open. Copy the code given below in that file and save it. Firstly, we will include the Stepper. This library provides useful functions that make it easy to control the stepper motor. The next step is to define the steps per revolution.

This is the number of steps our motor requires to move one complete revolution. If using NEMA 17 set the value to If using 28BYJ instead set the value to Next, we will define the input pins of the motor connections with the Arduino board.

However, you can use any other suitable Arduino digital pins as well. Now we will create an instance of the Stepper library called motor and pass the steps per revolution and the individual motor input pins as arguments. Make sure you specify the input pins in their correct sequence.