adebeun

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Last Notes

2026-07-08 10:25:28 UTC

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@nprofile…hrzl The Schmitt gates and RCs are monostables. They set the duration of the drive signal and stretch the received pulse so that the signal can be decoded using a standard UART peripheral.

2026-07-06 05:43:59 UTC

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@nprofile…hrzl
This is a circuit I used years ago. The transformer in this case was a small pulse transformer, providing >2kV isolation. The inputs and outputs are standard microcontroller UART pins. But TxD needs to tristate at the end of the transmission (using end-of-tx interrupt). Comms is half-duplex. This was operating at 230.4kb/s.
https://files.mastodon.social/media_attachments/files/116/871/411/833/595/604/original/a7a92963adb28a3a.png