DTMF based motor control

Abstract

The main aim of this project is to control the motor using DTMF technology.

Description

The system comprises a small electronic unit with a mobile keypad, which is fixed to the electronic circuitry .The devices to be controlled will be selected from his hand held mobile. According to the key pressed at the receiver side the corresponding device will be controlled. A DTMF decoder CM8870C which decodes the keypad signals and these signals are given to the microcontroller.

When we pressed one key in transmitter side, motor will rotate in one direction. If we pressed another key in the key pad motor will rotate in another direction.

A buzzer is provided for audio acknowledgement of the key impression. Whenever a key is pressed on the numeric key pad from his handheld numeric keypad, the system acknowledges the impression by a short beep sound. This buzzer is driven by an NPN transistor.

The programming language used for developing the software to the micro-controller is Embedded/Assembly. The KEIL cross compiler is used to edit, compile and debug this program. Here in our application we are using AT89C51 micro-controller which is Flash Programmable IC.AT represents the Atmel Corporation represents CMOS technology is used for designing the IC.

Block diagram

DTMF based motor control

HARDWARE COMPONENTS

1. Micro-controller
2. MOBILE
3. Uln2003 driver.
4. POWER SUPPLY.
5. Devices
6. buzzer.

SOFTWARE TOOLS

1. EMBEDDED C
2. KEIL compiler
3. PROTEUS