Infrared LEDs are not the same as conventional LEDs, although their appearance is exactly the same.
And the normal human eye will not be able to see the light emitted by the infrared LED.

Therefore, it will be difficult to check if an infrared LED is good or broken.

Today, I will show you the simplest way to test IR LED, including IR emitter and IR receiver LED.

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!!! DO NOT COPY & REUP !!!
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