The Remote Controlled Land Rover operates using RF transmission. The remote control has the advantage of adequate range (up to 200 metres with proper antennae) besides being omnidirectional. The Land Rover can move in forward, reverse, left and right directions.
The decoder being used for the project has latched outputs and as such the buttons
on remote control need not be pressed for more than a few milliseconds.
Forward and reverse movement: The Remote-Controlled Land Rover uses a 30-rpm geared 6V DC motor coupled to the left front wheel and another identical motor coupled to the right front wheel. During forward (or reverse) movement
of the vehicle, the two wheel shafts move in opposite directions (one clockwise and the other anticlockwise).
Steering control: There are different methods available for steering a vehicle. For the Lan Rover steering, the two driving wheels are independently controlled to turn. For the rear wheels, a single 5cm diameter plastic caster wheel is being used. A Caster wheel turns by 180° when the direction of the vehicle motion is reversed. This way the movement of the rover becomes stable in both the forward and reverse directions. The steering (clockwise or anticlockwise) motion is achieved by driving only one
wheel at a time.
Drive Circuit: The input terminals of the motor drive circuit for the right-hand motor have to be fed with reverse-polarity control signals compared to those of the left-hand motor drive circuit.
Remote Control. For remote control, the Holtek encoder-decoder pair of HT12E and HT12D employing RF as well as IR principles, are used. Both of these are 18-pin DIP ICs.
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