We know that in industries, loads are distributed over large distances, and it is not convenient to operate all those equipment time to time and it is also time to consume.
Also in agricultural fields, water pumps and other electric systems are spread over the large area and it is hard to operate these systems to farmers. We can use this circuit in the home too, therefore this can also be called as DTMF based home automation project. Keeping all these problems in mind, a DTMF based load control system is designed as follows.
In DTMF based load control system, a cell phone (mobile) is connected to the circuit from its audio output (audio jack) to receive the tone generated by the operator mobile. Whatever audio signal (in the form of frequency) is received from mobile then decoded (to its digital code) by the use of DTMF decoder which is one of the main parts of the project. Then this digital code goes to 8051 microcontrollers which on/offs respected relay to control that electric equipment. a relay driver IC is interfaced with the microcontroller to actuate the relays.
Components required:
| Sr. no | Equipment | Quantity |
| 1 | IC 8051 MC | 1 |
| 2 | MT 8870 DTMF IC | 1 |
| 3 | Crystal (3.579545mhz) | 1 |
| 4 | VOLTAGE REGULATOR | 1 |
| 5 | 2 LINE LCD DISPLAY | 1 |
| 6 | CRYSTAL OSCILLATOR(11.0592mhz) | 1 |
| 7 | DIODE | 1 |
| 8 | PUSH BUTTON | 1 |
| 9 | LEDS | 4 |
| 10 | RESISTER(220O,4.7kO,10kO) | BOX |
| 11 | CAPACITORS(10uf,1000uf) | 5 |
| 12 | RELAYS | 2 |
| 13 | Bc547 | 2 |
[caption id="" align="aligncenter" width="584"]DTMF based load control system block diagram[/caption]
[caption id="" align="aligncenter" width="584"]DTMF based load control system circuit diagram[/caption]
Software requirements: Keil compiler
Languages: Embedded C or Assembly
DTMF IC (MT 8870) Pin configuration
[caption id="" align="aligncenter" width="194"]MT 8870 pin diagram[/caption]
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