This is an IR UART adapter. Its transmitter and receiver are independent, there is no automatic echo suppression. The receiver is based on TSDP34156 IR receiver. The transmitter is built using TSAL6400 940 nm IR LEDs and a carrier generator based on 74HC132 quad-NAND CMOS gate.
The nominal transmission rate is 9600 baud. The carrier generator should be tuned to 57.6 kHz (with 6 cycles per bit it gives
The adapter can be powered from 3.3 V or 5 V and will operate with the corresponding logic levels.
The board size is just 21x36 mm and provides 8 unconnected PTH (plated through holes) for mounting purposes. It should fit the Pico (RP2040) board well.
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With minor adjustments after the first tests, the modules work as expected transmitting and receiving 1 kHz test signal. Using the modules with UART hasn't been tested yet.
Some more photos and/or info may be found at hackaday.io/project/195022-ir-uart.