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IR LED not working What gives?

03 Nov.,2023

 

Fortunately, he probably hasn't blown up the LEDs. Not on 1.2 volts.
It is possible to check them anyway.

Check their resistance with a miultimeter. If they are short circuited in both directions, they are blown up.

If they are not short circuited, wire them up to 5 volts via a 200 ohm resistor.
The + of the 5 volts should go to the resistor. The other side of the resistor goes to the

long lead of the LED

and the other lead of the LED goes to the -ve side of the 5 volt supply.

Now, with a multimeter on a 10 volt range, measure the voltage across the LED.
If it is about 1.9 volts the LED is OK.

You should be able to check this LED by viewing the LED with a camcorder or a digital camera, as you have been doing. It will light up in the camera viewfinder screen when you apply power.

If the voltage is not about 1.9 volts and is the same as the supply voltage, try reversing the LED. If that doesn't fix it, the LED is probably open circuit.

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