Circuit Diagram of Cell phone operated land rover Robotic Vehicle:

Circuit Diagram of Cell phone operated land rover Robotic Vehicle:

The main components of this cellphone-operated robotic landrover are microcontroller, motor driver and DTMF decoder. An MT8870 series DTMF decoder is used in this project which uses digital counting techniques to detect the 16 DTMF tone pairs into a 4-bit code output. The built- in dialtone circuit eliminates prefiltering. If an input signal is given at the pin2, then the input configuration is recognized to be effective. The 4-bit-decode signal of the DTMF tone is transferred to the pin11 through the pin 14′s output. These pins are connected to the microcontroller pins Pao, Pa1, Pa2 and Pa3. The output of the microcontroller from port pins PD0 through PD3 and PD7 are fed to the inputs IN1, IN4 and enables the pins EN1, EN2 of the motor-driver L293D IC to drive  the two DC motors.

Circuit Diagram of Cell phone Operated Land Rover

In this circuit, S1 switch is used for manual reset. The output of the microcontroller  is not enough to drive the DC motors, so current drivers are necessary for motor rotation.The  L293D  motor driver is designed to provide bidirectional drive currents of up to 600 mA at voltages from 4.5V to 36V, which makes it easier to drive the DC motors. The L293D motor driver consists of four drivers. The pins IN1 through IN4 & OUT1 and OUT4 are the input and output pins of the driver 1 through driver 4. The drivers 1,2,3 and 4 are enabled by the enable pin1(EN1) and the pin 9 (EN2). When enable input EN1 (pin1) is high, the drivers 1 and 2 are enabled. Similarly, the enable input EN2 (pin9) enables the drivers 3.

Advantages and Disadvantages:

The advantages of cellphone-operated-robotic landrover include wireless controlling provisioning and surveillance system, 3G-technology-based vehicle navigation, and limitless operational range based on the network of the cellphone. The disadvantage include: the cost as the cellphone billing is high; mobile batteries discharge : the discharging problem associated with the batteries as the batteries loss charge due to quick discharge because the load is high; adaptability: the system is not adaptable to all cellphones, but the ones with the headset attached can only be used.

Thus, this Cellphone-operated robot project is very useful in military applications to control military vehicles by using a mobile phone. In  future, we can detect the position of enemies by arranging a wireless camera to the land rover robotic vehicle. This project can  also be helpful in academics as students can learn various terminologies and principles proposed in this project. This project will help students add their innovative thoughts and ideas todevelop robotics projects.