Electronics > Projects, Designs, and Technical Stuff
short range (<cm) full duplex IR data exhange?
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langwadt:

--- Quote from: pwlps on April 18, 2019, 04:41:16 pm ---
--- Quote from: eliocor on April 17, 2019, 09:49:32 pm ---If you want to use the same optical path, and mantain a full duplex communication, your only solution is using different IR light wavelengths: 850nm and 940nm, followed by optical filters on the receivers. 

--- End quote ---

The "only solution" is a bit exaggerated and discouraging for the OP's project.  The FSK demodulation bandwidth is controlled by the loop filter time constant so that there is a of course a tradeoff between the frequency selectivity and the maximum bitrate, in other words sacrifying the bitrate you can have as many FSK channels as you want in a single IR wavelength channel.

--- End quote ---

doesn't help if a device's receiver is swamped out by its own transmitter

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