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Add description of board 2 in electrical readme

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Håkon Løvdal 2018-01-27 10:32:26 +01:00
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Electrical/README.md
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@ -5,12 +5,26 @@ Here are links to the different board designs together with a short summary.
## Board 1
This project currently contains only one [board design](Board_001). It
The project's original [board design](Board_001). 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](Board_002) 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](http://www.kicad-pcb.org/) source files.
### Status
Unfinished, just started.