PWM Controller using UART interface - Atmega328p

Overview

The main purpose of this project is to learn how to interface an user through UART interface to the PWM module driving a DC Motor. The program is able to show the motor's speed in terms of percentage of Vmax.

Components

• 330 Ohm resistors (x4);
• Shift registers (i.e. SH74HC595N) (x2);
• DC Motor (x1);
• Motor driver (i.e. L293D) (x1);
• 4-digits-7-segments display (i.e. );
• Power supply or battery (x1);

Schematics

Check all the schematics in this folder: Pics

File description

display.c

In this file you can find all the functions needed in order to display the speed percentage, controlling the shift registers logic.

main.c

This file contains the main function, in which several operations are done as following:

• Set PINs for data registers, latch clock, shift register clock, output enable signal and the timer0' output;
• Set the UART interface and its function mode;
• Set Timer0 in Fast-PWM mode;
• UART Interrupt handling for receive operations;