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Tip from http://www.youtube.com/watch?v=Hp5ngKtl7S4 Via Stitching In KiCad (without traces) By Contextual Electronics
Overview
Here are links to the different board designs together with a short summary.
Board 1
The project's original board design. It
- is based on the ESP8266 chip.
- is powered by USB.
- uses a very simple voltage divider to demodulate the M-bus signal.
- has shematic and pcb design only available as finished pdf/png files.
Status
Prototypes have been made and some people have started using them(?).
Board 2
This board design is a newer alternative to the original. It
- is an Arduino shield.
- uses the industry standard TSS721 chip to interface the M-bus.
- is optically isolated.
- has shematic and pcb design available in editable KiCad source files.
Status
Unfinished, just started.
Board 3
This board is a M-bus master simulator to be able to develop and test the other boards without being dependent on having and using a real AMS unit.
Status
Implementation done.