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Dtmf Automation

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Dtmf Automation
Class: TE Batch: T7 Group no: 75 SYNOPSIS
TITLE: ROBOT ARM AUTOMATION USING DTMF
OBJECTIVE: To control the robot arm from a distant place using mobile DTMF AUTOMATION
BLOCK DIAGRAM:

Mobile used as remote
Connected Mobile

Motor Driver

R/L Motor
Microcontroller
ATMEGA-16
AVR
DTMF Decoder

DESCRIPTION AND WORKING:
Conventionally, wireless-controlled robot arms use RF circuits, which have the drawbacks of limited working range, limited frequency range and limited control. Use of a mobile phone for robotic arm control can overcome these limitations. It provides the advantages of robust control, working range as large as the coverage area of the service provider, no interference with other controllers and up to twelve controls .The control of robot arm involves three distinct phases: reception, processing and action. Generally, the preceptors are sensors mounted on the robot, processing is done by the on-board microcontroller or processor, and the task (action) is performed using motors or with some other actuators.

In this project, the robot arm is controlled by a mobile phone that makes a call to the mobile phone attached to the robot arm. In the course of a call, if any button is pressed, a tone corresponding to the button pressed is heard at the other end of the call. This tone is called ‘dual-tone multiple-frequency’ (DTMF) tone. The robot arm perceives this DTMF tone with the help of the phone stacked in the robot arm. The received tone is processed by the ATmega16 microcontroller with the help of DTMF decoder MT8870. The decoder decodes the DTMF tone into its equivalent binary

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