Timeline for Is it possible (with reasonable effort) to use ethernet hardware to provide point-to-point digital I/O bridge?
Current License: CC BY-SA 4.0
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| May 3, 2021 at 10:24 | comment | added | M Szil | Thank you all for your responses - a lot of good information. I think this answer is probably closest to my original intention. Thinking an SPI-type interface may manage the throughput on 4 wire (pairs), "just" add Manchester encoding, LVDS drivers, ac-coupling capacitors and 100Mbps magnetics (I know that's an oversimplification). Hacking Ethernet/PoE just sounds enticing: reasonable isolation, remote power, simple cabling. But perhaps distributed "brains" like Pi Picos with conventional ethernet may make more sense (to control a motor via quadrature where occasional bit errors add up). | |
| May 3, 2021 at 9:39 | vote | accept | M Szil | ||
| May 2, 2021 at 0:43 | history | edited | hacktastical | CC BY-SA 4.0 |
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| May 1, 2021 at 22:47 | history | edited | hacktastical | CC BY-SA 4.0 |
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| May 1, 2021 at 22:33 | history | edited | hacktastical | CC BY-SA 4.0 |
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| May 1, 2021 at 22:26 | comment | added | hacktastical | The galvanic isolation is a huge benefit when working at distance. Manchester coding is ridiculously simple, biphase-mark only slightly more complex. One possible hack would be to use I2S from the R.pi and send it via AES/EBU. That’s about 6Mbit right there, and would have a deterministic latency of about 4-5us using 192kHz mode. | |
| May 1, 2021 at 21:58 | comment | added | tobalt | I like this answer as it is the only one in the spirit of the question imo. Not about ethernet but about how to get data somewhere 30m away. Maybe it will be even easier to skip all the transformers and manchester's and use STP with DC coupling? I don't know the chances of this working and it is also less safe. | |
| May 1, 2021 at 20:11 | history | edited | hacktastical | CC BY-SA 4.0 |
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| May 1, 2021 at 20:05 | history | edited | hacktastical | CC BY-SA 4.0 |
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| May 1, 2021 at 20:00 | history | edited | hacktastical | CC BY-SA 4.0 |
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| May 1, 2021 at 0:16 | history | edited | hacktastical | CC BY-SA 4.0 |
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| May 1, 2021 at 0:09 | history | answered | hacktastical | CC BY-SA 4.0 |