Diy Bipolar Stepper Motor Driver Circuit

DIY Bipolar Stepper Motor Driver Circuit

A stepper motor is a type of electric motor that converts electrical pulses into discrete angular movements. This makes them ideal for applications where precise positioning is required, such as in robotics, CNC machines, and 3D printers. Stepper motors are available in a variety of sizes and power ratings, and they can be driven by a variety of different control circuits. In this article, we will build a simple DIY stepper motor driver circuit that can be used to control a bipolar stepper motor. The circuit is based on the L293D H-bridge chip, which is a popular choice for driving stepper motors. The L293D is a very versatile chip that can be used to drive a wide variety of motors, including bipolar stepper motors, DC motors, and servo motors. The circuit is very simple to build, and it can be assembled using a few common electronic components. The parts list and schematic are shown below.

Parts List

* L293D H-bridge chip * 2N2222 NPN transistor * 10k ohm resistor * 1N4007 diode * 470uF capacitor * 12V power supply * Bipolar stepper motor

Schematic

[](https://i.imgur.com/14583e2.png)

Assembly Instructions

1. Solder the L293D chip to a breadboard. 2. Connect the motor leads to the terminals of the L293D chip. 3. Connect the power supply to the VCC and GND terminals of the L293D chip. 4. Connect the 10k ohm resistor between the ENA and IN1 terminals of the L293D chip. 5. Connect the 1N4007 diode between the IN1 and OUT1 terminals of the L293D chip. 6. Connect the 470uF capacitor between the VCC and GND terminals of the L293D chip.

Testing the Circuit

Once the circuit is assembled, you can test it by connecting it to a power supply and a stepper motor. The stepper motor should rotate when you apply power to the circuit. You can use a potentiometer to adjust the speed of the motor.

Code

The following code can be used to control the stepper motor using the L293D driver circuit. ```python import RPi.GPIO as GPIO import time # Define the GPIO pins used for the motor driver IN1 = 23 IN2 = 24 IN3 = 25 IN4 = 26 # Set up the GPIO pins GPIO.setmode(GPIO.BCM) GPIO.setup(IN1, GPIO.OUT) GPIO.setup(IN2, GPIO.OUT) GPIO.setup(IN3, GPIO.OUT) GPIO.setup(IN4, GPIO.OUT) # Define the step sequence step_sequence = [ [0, 0, 1, 1], [0, 1, 0, 1], [0, 1, 1, 0], [1, 0, 1, 0] ] # Start the motor rotating clockwise for step in step_sequence: GPIO.output(IN1, step[0]) GPIO.output(IN2, step[1]) GPIO.output(IN3, step[2]) GPIO.output(IN4, step[3]) time.sleep(0.005) # Stop the motor GPIO.cleanup() ``` ## Conclusion In this article, we have shown you how to build a simple DIY stepper motor driver circuit. The circuit is based on the L293D H-bridge chip, which is a popular choice for driving stepper motors. The circuit is very simple to build, and it can be assembled using a few common electronic components. The code provided in this article can be used to control the stepper motor using the L293D driver circuit.


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