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Remote Tester Circuit

Summary

Today we are controlling many appliances with the help of remote like AC, TV or music system. It often happen that remote stops working due to any reason (low battery or any button of remote becomes faulty). Therefore here is the remote tester circuit to test your remote to identify that appliance (TV, AC etc) has problem or your remote is not responding. Advantage of circuit-

1. Based on single sensor.

2. Circuit consumes very less power.

3. Almost every remote can be tested with the help of this circuit as operating frequency of sensor is 38 KHz.

4. High immunity against ambient light.

5. With little modification in the circuit you can use it to control your home appliances with remote.

Circuit for Remote Tester

Description

 

This remote tester circuit is based on infrared sensor IC TSOP1738. TSOP1738 contains photo detector and preamplifier both in one package. It is a three terminal device. Pin1 is used as ground pin. Pin 2 is for power supply and pin 3 is used for output. Pin diagram of TSOP1738 is shown below. Take care while connecting the TSOP pins as wrong connections may lead to damage of sensor. Following figure shows the pin diagram of TSOP1738.

TSOP 1738 Configuration

 

Assemble the circuit as shown in circuit diagram and apply power supply. When power supply is given LED connected at the output starts blinking. When IR waves from remote fall on the sensor, its output changes to low state. This will turn ON the transistor connected at the output and LED will blink according to the button press on the remote. If this phenomenon happens, it means your remote is working fine. Here R2 and D1 are used to limit the current into the sensor. Do not supply more than 5V directly to pin 2 of TSOP1738 else it will destroy the sensor.

 

Circuit Diagram

Components

Resistor Image
Resistor

Resistor is a passive component used to control current in a circuit. Its resistance is given by the ratio of voltage applied across its terminals to the current passing through it. Thus a particular value of resistor, for fixed voltage, limits the current through it. They are omnipresent in electronic circuits.

...
LEDs | Light Emitting Diode
LED
 
Light emitting diodes (LEDs) are semiconductor light sources. The light emitted...
1N4001 Diode Image
Diode 1N4001

1N4001 is a member of 1N400x diodes. Diode is a rectifying device which conducts only from anode to cathode. Diode behaves open circuited for the current flow from cathode to anode. 1N4001 is a 1A diode with low forward voltage drop and high surge current capability. It comprises of diffused PN junction and has low reverse leakage current of 5µA. Its DC blocking voltage is 50V.

...

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