Wireless DTMF Controlled Robot using DTMF Receiver and Motor IC [No Coding Required]

In this post, I will show you how to make a DTMF Controlled Robot using DTMF Receiver and Motor IC.

Snapshot of Final Project

Introduction

DTMF stands for Dual tone Modulation Frequency which we generate from our mobile phone keypads. We will generate DTMF tones from one phone and from 2nd phone we will Receive the tones, then from the 2nd phone output will go to the DTMF Receiver which will operate the Motor IC and finally the Motors are driven with the help of Motor IC.

Working Principal

DTMF tones generated from Mobile phone keypads has low and high frequencies is given to the DTMF decoder IC which separates the low and high frequencies in to 4 bit binary coded bits. This data at the output is directly given to the Motor driving IC to drive the two motors. These motors rotate according to the input combination given to Motor IC.

The following figure shows the output coded bits we get corresponding to the buttons we press on the mobile phone keypad:

Fig. Four Bit Binary output Corresponding to Mobile phone keypad. (Image Source: http://www.lemalabs.com/dtmf/)

The following figure will show you the Truth Table of Motor IC (L293D):

Fig. Motor IC Truth Table

Components

The following list of Components are required for this Project:

1. DTMF Receiver IC (HT9170B) - http://bit.ly/2SRc7Pn

2. Motor Driver IC (L293D) - http://bit.ly/2UqluHt

3. 3.58 MHz Oscillator - http://bit.ly/2TuRii4

4. Two DC Motors with Wheels (60RPM each) - http://bit.ly/2IZ8W8E

5. 9 Volt Battery - http://bit.ly/2SQrLdF

6. 7805 Voltage Regulator - http://bit.ly/2H7UsSc

7. Resistance (100k) - http://bit.ly/2VLLLAg (2 Pieces)

8. Resistance (330k/300k) - http://bit.ly/2VLLLAg

9. Capacitor (22pf Ceramic Capacitor) - http://bit.ly/2VMC5p7 (2 Pieces)

10. Capacitor (0.1uf Electrolytic Capacitor) - http://bit.ly/2EVu3Vn (4 Pieces)

11. Bread Board - http://bit.ly/2J2jUKv

12. Connecting Wires - http://bit.ly/2EV3gZ4

13. Two Mobile Phones

14. 3.5mm Audio jack

Circuit Diagram

Following Image will show you how to make the Connections:

Fig. Circuit Diagram

Final Circuit

This Video will show you how the Circuit should work Finally.

Note:- I made a call from my phone and the phone next to me receives it in Auto Answering Mode. You should change the settings of the other phone so that it can receive the call in Auto answering else you have to receive the call manually every time.

How to "Video"

If you are not able to understand how to make this circuit work then watch the video below.

HD Video link:

http://bit.ly/2HoAxOg

Submitted Circuit

A Video of Final Circuit submitted in College, Due to our bad Soldering and layout in PCB the circuit does not function as smooth as before, but still it works.

Fig. Final Circuit

Group Members:

Harneesh Bhatia

Himanshu Gupta

Jaiyesh Paraste

G. Raghav

This Project was our Minor Project in 2014 (3rd Year).