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. There is a cut at the edge of the wheel from where the IR can pass. Using this arrangement the speed is measured by the microcontroller and also it is transmitted at the other end using X Bee modules. The data from IR transmitters is in analog form.
In this kit contactless tachometer and wireless telemetry this data is converted into digital data and fed to the microcontroller. The microcontroller reads the data on interrupt basis and then calculates the speed on the basis of timing. A dot matrix LCD is connected with the microcontroller at the transmitter end. The Xbee is connected at the transmitter end and works on serial port. At the receiving end also there is an Xbee connected which receives the data and this data is displayed on the LCD. The whole system requires two power supply of 12v 1A.
BLOCK DIAGRAM OF CONTACT LESS TACHOMETER AND WIRELESS TELEMETRY