IR Transmitter and receiver are used to control any device wirelessly, means remotely. TV remote and TV are the best example of IR transmitter and receiver. TV generally consist TSOP1738 as the IR receiver, which senses modulated IR pulses and convert them into electrical signal.

The idea came to me when i was ready to replace a battery cell in my alarm clock next to my bed. Even i am using the last 5 years only rechargeable batteries of the most types i considered how many battery cells people around the world throw away in a simple move like that i did now

The purpose of electronic circuits is to control the flow of electric currents. This may sound like a silly question, but why do we need to control the currents? Well, it has been found experimentally that the intensity of various electrical effects is related to the amount of the charge Q that passes by a certain region per unit time.

Burglar alarm system is an important part of home security systems. This burglar alarm project is based on PIR sensor, UM3561 and Speaker. PIR sensor used to detect body motion and UM3561 & speaker to produce Police siren after any movement detection.

We are very much familiar with our television sets, DVDs, MP3 players, music systems and many other device that are controlled by using IR Remote. There are many types of remote controls available for different devices but most of them work on around 38KHz Frequency signal.