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29 lines
1.5 KiB
Markdown
29 lines
1.5 KiB
Markdown
# HAN_ESP_TSS721
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This is the current and most robust design for the [main board](HAN_ESP_TSS721). 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/)
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The [design](./kicad) uses an [ESP8266](http://esp8266.net/) in an ESP12 module from [AI Thinker](https://www.ai-thinker.com) for micro processing and the [TSS721](http://www.ti.com/product/TSS721A) from Texas Instruments for level conversion from M-Bus to TTL (3.3V). An earlier design solved the level conversion using an op-amp, which might be an easier and more available solution, but also more error-prone.
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The board
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* uses TSS721 for MBus to TTL conversion
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* holds ESP8266 for processing and transmit HAN data to WiFi / MQTT
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* full schematics and PCB in editable [KiCad](http://www.kicad-pcb.org/) source files
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* features a temperature sensor (DS18B20)
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* uses a modular design, leaving these features optional
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* temperature sensor
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* M-bus TX
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* WiFi (Leave ESP, power supply and use for only M-bus to TTL)
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Full schematics is available for this board in the kicad folder.
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There is also a 3D printable enclosure in stl folder.
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*The completed board mounted in a [3D printed enclosure](/Enclosure)*
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*...installed with the electrical meter...*
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