TV Remote Tester [Making IR Sensor Module at Home]


Introduction: TV Remote Tester [Making IR Sensor Module at Home]

Hi everyone.Today i will show you how to make the simple remote testing circuit with few resistors,transistor,IR sensor,led and diode.this project can also use as the ir module for other projects like line following robot,obstracle sensing robot,edge sensing robot,etc.

Step 1: Things Needed to Make This Remote Tester Are:-

For making this tv remote tester circuit you will needed the following items:-

1.small PCB to make the circuit

2.IR Sensor any IR sensor will work [i have used TSOP 1838 B]

3.BC557 [PNP Transistor]

4. IN4148 diode

5. 47 ohm resistor

6. 10K resistor

7. 1K resistor [two you will need]

8. 3V small any colour led for indication purpose

9. connecting wires

10. 4.8V power supply[ i used three to four AA battery each of 1.5 volts to make total 4.8 to 6V dc]

Step 2: Making the Circuit.

As shown in the images we have to make the circuit according to the image .

the positive terminal of the power source is connected to the 10K,47 ohms and emitter of the transistor where as negative terminal of the battery is connected to the indicator led's negative leg and ir sensor ground leg and afterit the led's positive leg is connected to the 1K resistor and that 1K resistor other leg is connected to the BC557 transistor's collector leg and transistor's base is connected to the 10K resistor another leg and 1K resistor where as 1K resistor another leg is connected to the IR Sensor's output leg and that 47 ohms resistor another leg is connected to the IN4148 diode and othe leg of diode is connected to the IR Sensor's voltage in leg.

after fixing the arrangement into the PCB solder all the connection.

Step 3: Testing It:-

After soldering the parts on the PCB the circuit will looks like the image i have uploaded and not its the time to test it so put on the power supply and to test it bring the TV remote and press any key now as soon as we press the key the indicator led will be glow up according to the frequency of the button pressed in the TV remote.

If you want to add buzzer to the circuit then connect the circuit of the buzzer to the two legs of the led and this circuit will also work with buzzer without any modification only the thing you have to keep in mind while making the circuit is to be careful about the pinouts of the IR Sensor which you are using to make the circuit and other thing is do not apply over voltage to the circuit as in case of over voltage the ir sensor will not work and the connection will be made directly through it and the indicator led will be continuously glowing the the effect of the IR Sensor will be not able to see. if you will make exactly i have made the circuit then your circuit will never fails it will work. be careful about the other connection of circuit also.




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    7 Discussions

    Hi! Can you send me a step-by-step process 'cause I need it in my project?

    The TSOP1838 abs max rating is 6.0 volts, so if 4x1.5 volt AA cells are used, apart from volts drop across 1N4148 diode - this would exceed the safe max voltage.

    Apart from this what is the purpose of the diode - if it s reverse polarity protection, it would be better places at the input to also protect the transistor.

    I doubt this circuit could be used for e.g. line following a suggested, since there is a lot of response delay through the TSOP1838 recognizing a 38KHz signal

    Apart from

    4 replies

    after searching lot on net and refering the books i found that using the capacitor we would avoid the flickring of the led.


    i understand your doubt but i am new to electronics and i am also stuck up in this circuit as i am not able to overcome the problem of led(flashing instead of on and off) i also want to make line following robot.
    if i find any ways i will inform without fail.

    Your schematic is in error on the pin numbering of the TSOP1838.

    You should not tell people to use any old component - for example some components will have lower voltage ratings and could be destroyed.

    The 10Kohm pullup should not be needed since there is a 30K pull up in the TSOP.

    I don't see the point of the 47 ohm resistor - it would hardly limit the current and will not drop much voltage since it only feeds the TSOP which only draws a max of 5mA.

    Similarly, the 1N4148 will not drop much voltage, and if used at all would be better in the main battery feed as a reverse polarity protection.

    As for the LED flashing on off, etc. If you look at the datasheet for the Vishay TSOP1838 Page 4 Fig 6, you will see the output is high, except when there are brief pulses of IR light modulated at 38KHz, typically from a remote control. With you circuit driving a BC557, it will be on, and the LED also, except for these brief pulses which may be hard to see. You could try stretching the pulses with a NE555 timer (look up data sheet and suggested circuits) and invert signal so LED is only on during (stretched) pulses.

    As for a line follower, these are usually based on photo transistors to detect the difference between a black line, and a white background. An IR receiver looking for pulses of 38KHz infra red light is unlikely to be of any use.

    thank you for you help i will try to do as you are saying and once more thank for help.

    from last one months i am trying to make the line following robot with sensor but on your advice now i will shift to ir led type receive circuit.

    thank you for your help.

    I was wrong about the LED being mostly on. Because the BC557 is a PNP, it will be mostly off while the TSOP output is high (inactive). When it turns on briefly with the IR pulses, possibly these may be too short to be seen much.

    Maybe increase the LED current to say 20mA or more, by reducing its 1K resistor, provided you do not exceed the limit for the LED. Or try the NE555 as I suggested.

    The TSOP1838 is now obsolete. The TSOP32238 is a better choice, and can work on anything from 2.5 to 5.5 volts, so you could use just 2 or 3 AA batteries