Guru
Joined: 08/02/2015
Location: New ZealandPosts: 1204
| Posted: 10:37am 10 Jan 2026 |
The 1-Wire communications setup may be of interest, it is based on a 12v logic "wired OR" system, having a large hysteresis to get noise levels down.
The Master device supplies 12V,0v power to the slaves, with data isolation by opto - couplers. 2 way control bus floats at 12v when not active.
Schematic:
PCB 33 x 40mm:
Gerbers: 6 pcbs fit on a 100x100mm board, I get them made 1.2mm thick and cut with a very large tin snips
1WireV4Gerbers.zip
Cheers
Mike
Edited 2026-01-10 20:56 by Solar Mike