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I have a system transmitting UART (38400) over IR with a carrier frequency of 425khz.

How do I take a receiver led and feed this into a microcontroller. Obviously I can't just put it through an op amp and connect to the UART RX on the microcontroller because I need to remove/demodulate from the carrier frequency first.

What techniques can I use to do this?

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  • \$\begingroup\$ You can use a PLL (phase locked loop) based circuit. \$\endgroup\$
    – Ayhan
    Commented Feb 27, 2016 at 15:49

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Generally you can buy IR receivers that integrate the detector, bandpass filter, and amplifier all in one, with a variety of different bandpass filters for different carrier frequencies. The output of which could be fed directly into the UART RX.

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