In this project rather than using switches, we are controlling the robot car with our hand. Robot car will move in left, right, forward and backward direction according to the motion of our hand. So, simply by moving the hand we control the robot car.

The transmitter in this project is designed and prepared in such a way that you can wear it in your hand. The RF module with frequency 433 MHz is also used in this project. The RF module consists of RF transmitter and RF receiver. It allows only one way communication. It uses Amplitude Shift Keying (ASK) method for communication.

The input is taken from the accelerometer which gives output depending upon you hand’s motion. An Accelerometer is a kind of sensor which gives an analog data while moving in X, Y and Z direction. The outputs of accelerometer are connected to microcontroller which in turn sends digital codes to HT12E encoder IC depending upon the outputs of accelerometer. This encoder IC converts the parallel four bit data of four switches into a serial signal. The serial output of encoder IC is connected with input of RF transmitter. The RF transmitter will transmit the serial set of signals wirelessly using ASK technique.

The RF receiver receives the serial set of signals and sends them to the HT12D IC (Decoder). The HT12D converts the serial set of signals into parallel form. This parallel 4-bit data act as input or command for microcontroller and it performs the programmed operation corresponding to the input or command.

We can also add camera and some sensors to it like obstacle sensor etc.