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As you can see from these datasheet graphs, the peak frequency detection is at 38 KHz and
the peak LED color is 940 nm. You can use from about 35 KHz to 41 KHz but the sensitivity will
drop off so that it wont detect as well from afar. Likewise, you can use 850 to 1100 nm LEDs
but they wont work as well as 900 to 1000nm so make sure to get matching LEDs! Check the
datasheet for your IR LED to verify the wavelength.
Try to get a 940nm - remember that 940nm is not visible light (its Infra Red)!
Principle
Firstly, let's know the structure of the infrared receiving head: there are two important
elements inside the infrared receiving head, IC and PD. IC is receiving head processing
components, mainly composed of silicon and circuit. It is a highly integrated device. The
main function is filter, plastic, decoding, amplification, etc. PD is a photosensitive diode. The
main function is to receive the light signal.
Below is a brief working principle diagram:
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