The kit PC to PC communication deals with data transfer from one computer to another. It uses programming and the serial ports of the PCs. The ports are programmed. We use USB to UART module logic to convert USB logic to TTL logic and then a wireless transmitter circuit to transmit data (X-bee transmitter.
LGEC123: Contactless Tachometer and wireless telemetry
In this kit contactless tachometer and wireless telemetry we are monitoring the speed of any wheel wirelessly using X Bee modules. The speed is displayed at both ends on the LCD. IR sensors are used to sense the speed of the wheel.