List of DTMF Based Project Ideas for Engineering Students

DTMF or Dual Tone Multi Frequency is used for telecommunication signaling over analog telephone lines in voice frequency band between telephone handsets, other communication devices and the switching center.

There are many DTMF based projects developed for engineering students. So, here we are listing out few good and important DTMF Project Ideas which are more helpful for final year engineering students.

DTMF Project Ideas:

Following are few DTMF Projects Ideas.

1. DTMF based load controlled system:

This project defines a way for automatic control of any electrical appliances. The switching of any load can be achieved by just pressing a number on the cell phone. A person can dial a number from his/her mobile and this number is redirected to another mobile from where the tones are taken and decoded and the number is used as a command to operate the loads.

Here a number of lamps are used as loads and each lamp is driven by a relay. All the relays are operated by a relay driver which has inputs and outputs for each relay. Each load is assigned a particular number. When a particular number is dialed on the user mobile, the call gets directed to the system cell phone. The audio output of the cell phone is connected to the DTMF decoder which decodes the received DTMF tone to get the original number and feeds this information to the microcontroller. The microcontroller receives this information and accordingly gives proper signal to the input pin of the relay driver IC such that it energizes the particular relay and the required lamp is switched on. In a similar way the lamp can be switched off.

2. Mobile Phone based password system for home automatic door opening:

This project demonstrates automatic opening and closing of home door based on input from a cell phone. The input commands from the cell phone are sent to a control unit using DTMF communication technique and accordingly the door motor is operated so as to close or open the door. Thus the door can be controlled from far off distance just by using a cell phone.


This system consists of two parts – the transmitter and the receiver. The transmitter is the cell phone of the user. The command to open or close the door is given by pressing an appropriate number on the cell phone such that a call gets diverted to another cell phone or the landline.

At the receiver side, a cell phone or a landline is present which receives the call from the user cell phone. It is interfaced to a DTMF decoder which receives the DTMF tones and decodes it get the original data. This data is given to the microcontroller. The microcontroller is programmed such that based on the input from the user phone; it gives proper signals to the input pins of the motor driver. The motor driver IC then accordingly gives the output so as to rotate the motor in the desired direction to open or close the door.

3. Display of dialed telephone numbers on 7 segment display:

Here a digital display technique is designed to display the numbers dialed on a land line phone. Whenever a number is dialed on the phone, it is instantly shown on the 7 segment display.

Here a DTMF decoder is connected to the telephone line such that the when a number is dialed on the phone, the generated tone signals are fed to the DTMF decoder. The decoder decodes these tones to get the original data or the number pressed and feeds this information to the microcontroller. The microcontroller, on receiving the input, displays the number on the 7 segment LED display panel. Thus as we keep on pressing any 10 digit number, each digit gets displayed on the display panel accordingly.

4. Automatic Dialing to any Telephone using I2C protocol on detecting burglar:

Here a system is designed which detects any unauthorized entry to any place and accordingly dials a telephone number. The particular number is stored in the EEPROM interfaced to the Microcontroller and whenever any means of burglary is detected, the Microcontroller automatically dials the stored number through an encoder interfaced to it.

5. Cell Phone Controlled Robotic Vehicle: 

A robot is an automatic machine designed for human ease and convenience to carry out various tasks. A robot can be completely automatic with the control being automatic or can be a semi automatic machine with control in the hands of human beings. Here the secondary category is designed with an advanced control technique such that a button pressed on a cell phone can be used to provide proper motion to the robot in desired direction.

The user is required to press a specific number button on his/her cell phone. Pressing any number directly redirects to the cell phone which is embedded on the robot circuitry. The cell phone on the system is connected to the DTMF decoder which decodes the DTMF tone to receive the actual input. This input is fed to the microcontroller, which accordingly gives proper signals to the input pins of the motor driver IC to rotate the motors in desired direction, so as to achieve the proper motion for the robotic vehicle.

Look at the following some more interesting and useful DTMF project Ideas.

  • DTMF Based DC Motor Control
  • DTMF Based Home Appliance Control
  • DTMF Based Stepper Motor Control
  • Mobile Switching Device Using DTMF
  • DTMF Based Human less Boat Control for Oceanic Research Applications
  • DTMF Based Remote Control System
  • DTMF Based Home Automation System
  • DTMF Based Car
  • DTMF Based Device Control System
  • DTMF Based Prepaid Energy Meter
  • DTMF Based Electronic Voting Machine
  • DTMF Based Switching System for Power Efficiency
  • DTMF Based Industry Automation
  • DTMF Based Irrigation System
  • DTMF Based IR Proximity Sensor
  • DTMF Based Land Rover
  • DTMF Based Pick and Place Robot
  • DTMF Based Spy Robot
  • DTMF Based Water Pump Controller

Are you interested to know more about various other electronic projects? Then refer the following links:

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