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No, I was saying to use the pwm to obtain a constant carrier (for example, constant 38khz).Then, you will AND the output from this pwm pin with the output of TX (uart transmitter). This will create a stream of 38khz when TX is high, and nothing when TX is 0. In other words, it will modulate your data at 38khz. At the other end you can simply put a TSOP sensor
wait, aren't demultiplexers used when there are multiple outputs? in this case the output (in case i wanna use a single input) will only be one. So maybe i would need a multiplexer, am i right?
it should be received in the same time, though.
after all, do i really need a UART? i mean, maybe having a serial connection would be fine too, right?