| Electronics > Projects, Designs, and Technical Stuff |
| short range (<cm) full duplex IR data exhange? |
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| langwadt:
why do you need real full duplex? 500kbps isn't particularly fast, just do 1mbps and toggle between rx and tx |
| pwlps:
--- Quote from: max_torque on April 16, 2019, 06:42:01 pm ---RF is out because of the specific environment this device is used in (sorry, i can't be too specific....) I could arrange for the RX and TX channels to have two completely independent and separate optical paths, but it would be easier for them to share the same path, as that will remove any alignment issues and make for a smaller probe. I'm going to have a play around with that LM567, and see what data rate i can robustly get within it's maximum 500KHz demodulation frequency. --- End quote --- If you need higher freqs you might also have a look at this app note from TI: http://www.ti.com/lit/an/slaa618/slaa618.pdf |
| mikeselectricstuff:
High speed IRDA works well but all of the nice transceiver devices are obsolete now.4M and 16Mbit - Digikey only has stock left of this one https://www.digikey.co.uk/product-detail/en/rohm-semiconductor/RPM973-H11E2A/RPM973-H11E2ACT-ND/3769159 Forget full-duplex - witha free-air link you will always get reflections - if necessary ping-pong at a higher rate to get the same result |
| JVR:
--- Quote from: max_torque on April 16, 2019, 06:42:01 pm ---RF is out because of the specific environment this device is used in (sorry, i can't be too specific....) --- End quote --- I know the feeling. However, design is making the best compromises. Is having a 500Kbit link worth technician time and design/manufacturing issues? Or will a 100Kbit link do the same thing with off the shelf components, albeit a little slower. Last resort would probably be inductive or capacitive comms, but both also have other issues you will need to solve for. |
| mikeselectricstuff:
If you're basically going through a wall of a case then inductive may be a good choice, and doesn't need a window. Unshielded drum style inductors placed on-axis a few mm apart couple very well - 500k might get tricky but 100k should be no problem. |
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