In this project the robot car is controlled by a RF remote. The RF module with frequency 433 MHz is 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 four switches. These switches are interfaced to HT12E IC. 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.