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Info about HAN_ESP_TSS721

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Electrical/README.md
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Here are links to the different board designs together with a short summary.
## HAN_ESP_TSS721 (The current design)
This is the current and most robust design for the [main board](HAN_ESP_TS7221). There's been great help in creating this, both here on GitHub, but also at the Norwegian home automation forum, [www.hjemmeautomasjon.no](https://www.hjemmeautomasjon.no/forums/topic/1982-lesing-av-ams-data-amshan-iot/)
The board
* uses TSS721 for MBus to TTL conversion
* holds ESP8266 for processing and transmit HAN data to WiFi / MQTT
* full schematics and PCB in editable [KiCad](http://www.kicad-pcb.org/) source files
* features a temperature sensor (DS18B20)
* uses a modular design, leaving these features optional
* temperature sensor
* M-bus TX
* WiFi (Leave ESP, power supply and use for only M-bus to TTL)
### Status
At the time of this writing, this has never been tried as a whole, but all parts has been prototyped individually. First PCB prototypes are very soon in the order.
## HAN_ESP_Simple (Was: Board 1)
The project's original [board design](HAN_ESP_Simple). 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.
* 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
@ -24,8 +41,8 @@ This [board design](HAN_TTL_TSS721) 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.
* is optically isolate
* has shematic and pcb design available in editable [KiCad](http://www.kicad-pcb.org/) source files
### Status
@ -34,12 +51,10 @@ Unfinished, just started.
## MBUS_Simulator (Was: Board 3)
This [board](MBUS_Simulator) 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.
test the other boards without being dependent on having and using a real AMS unit.
### Status
Implementation done.
Please also see [Getting started building or modifying](GETTING_STARTED.md)