Week : 4

Title : Basic principle of infrared motion detector

Objectives : To know what is the basic principle of infrared motion detector in designing the device

Contents / Procedures :

In designing the device, it is based on two basic principle of  infrared motion detector which is the infrared transmitter and infrared receiver as shown in figure below.

 

Result / Analysis :

For the infrared transmitter which is also known as emitter circuit, it is on a basic design of timer 555  operation. The output of timer is connected to the infrared transmitter is used to produce pulse using a timer circuit.In  circuit operation, pulse will continually generated until the power supplied through the circuit is removed. The circuit produces a continuous train of pulses at any frequency required. This means that the 555 timer can operate repeatedly; it will switch ‘on’ and ‘off’ continually to generate data for the infrared transmission.

The infrared receiver which is also known as infrared detector receives the data transmitted by the infrared transmitter circuit. It is a simple electronics device on detecting infrared signal.This infrared detector can be directly connected into the controller circuit to produce logic high ‘1’ or low ‘0’ from the output terminal thus activate or deactivate the controller system operation. The range of infrared detector components according to datasheet stated that the infrared detector can fully operates on detecting the infrared signal of 38 to 45 kHz.

Conclusion :  From the principle of working theory, infrared detector are using dual beam transmission as structure, one side with transmitter for emitting infrared beam, the other side with receiver for receiving the beams.