This project aims to control electrical appliances remotely using a mobile phone through DTMF (Dual Tone Multi-Frequency) technology. It uses a PIC microcontroller as the main control unit. When a user presses a key on the mobile phone, the DTMF decoder receives the signal and sends it to the PIC microcontroller. Based on the received signal, the microcontroller operates different appliances through relays. The system can control devices such as an AC water pump, AC bulb, DC motor, and DC fan. A regulated power supply provides the required power to the circuit. Reset, crystal oscillator, and LED indicators are also included for proper operation and status indication. This system is especially useful for farmers in rural areas, as they can switch agricultural equipment and electrical appliances ON or OFF remotely without visiting the equipment location. It reduces manual effort, saves time, and makes agricultural activities easier and more convenient.        

The main objectives of the project are:  

1. To design a robot for automatic weed cutting in agricultural fields.
2. To attach metal triangular blades to the front side for cutting unwanted weeds.
3. To control robot movement and blade operation using a PIC microcontroller.
4. To detect obstacles using an IR sensor and stop the robot automatically.
5. To reduce manual labour, time and effort in weed removal.

           

The major building blocks of this project are:  

1. Regulated Power Supply.
2. PIC Microcontroller.
3. DTMF decoder.
4. Relays.
5. AC water motor.
6. AC Bulb.
7. DC motor.
8. DC fan.
9. Crystal
10. Reset.
11. LED indicators.

           

Software’s used:    

1. PIC-C compiler for Embedded C programming.
2. PIC kit 2 programmer for dumping code into Micro controller.
3. Express SCH for Circuit design.

           

Regulated Power Supply:          

               

Block diagram:

             

video: