IR Remote Control Tester
Here is a simple tester for checking the basic operations of an infrared remote control unit. It is low-cost and easy to construct. The tester is built around infrared receiver module TSOP1738. Operation of the remote control is acknowledged by a tone from the buzzer (or an LED). The circuit is sensitive and has a range of approximately ten metres.
Working
The integrated IR receiver detects, amplifies and demodulates IR signals from the remote control unit. The piezobuzzer connected at its output sounds to indicate the presence of signal from the remote control unit.
As shown in Fig. 1, output pin 3 of IR receiver module TSOP1738 normally remains high and the piezobuzzer is in silent mode. When the IR module receives an infrared signal, its output goes low and, as a result, the piezobuzzer sounds to indicate the reception of signal from the remote (such as TV remote control unit). Power supply for the circuit is derived from the mains using a capacitive potential dropper, a half-wave rectifier, a shunt regulator and associated components.
Circuit Diagram
Pin Configuration
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