Sample Codes

L293D based DC Motor Driver Interfacing with ATmega16 in PWM Mode

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DC Motor Driver is a L293D based motor driver interface board from ABLab Solutions. The main aim of interfacing DC motor with any microcontroller is to control the direction and speed of a DC motor. But due to high voltage and current requirement of DC motors, it cannot be interfaced directly with microcontrollers. For to interface DC motor with any microcontroller, we need a motor driver. Motor driver is basically a current amplifier which takes a low-current signal from the microcontroller and gives out a proportionally higher current signal which can control and drive a motor. L293D is a dual H-Bridge motor driver IC. With one L293D IC we can interface two DC motors which can be controlled in both clockwise and counter clockwise direction.

In this project, we will learn How to interface a L293D based DC Motor Driver in PWM mode with AVR ATmega16 microcontroller. The PWM mode is used to control the speed of DC motors. Higher the duty cycle of the PWM signal higher is the speed of DC motor. The ATmega16 microcontroller will generate PWM signals of different duty cycle using its Timer Counter 0 and Timer Counter 2 and will give the PWM signal to the two enable pins of the L293D. Here, we will use the DC Motor Driver to control the speed of two DC motor mounted on a Robot. In this way, the microcontroller will run the robot in forward direction with different speeds.

Softwares Required

• AVR Studio 4 Software
• WinAVR 2010 Software
• SinaProg Hex Downloader Software
• USBasp Driver

Hardwares Required

Name	Quantity
AVR Trainer Board-100 with ATmega16	1pc
AVR USB Programmer	1pc
12V, 1A DC SMPS Adaptor	1pc
DC Motor Driver	1pc
Robot V 4.1	1pc
1 to 1 Connector-Female to Female	3pc
10 to 10 FRC Female to Female Connector	2pc

Video

Connection Guide

The step-by-step connection guide for L293D based DC Motor Driver Interfacing with ATmega16 in PWM Mode is as follows