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40 lines
1.8 KiB
Markdown
40 lines
1.8 KiB
Markdown
# Hardware options
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There are currently two possible hardware options for this project, both in need of external power supply. A self powered board is under development by a member of the community and is currently being tested.
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## Hardware v1 by [@roarfred](https://github.com/roarfred)
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Composed from a ESP12E (or F) chip, this ESP8266 based board is designed specifically for this project with an on board M-bus chip.
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Building this project will require some skills in ordering and assembling electronic circuits as well as programming. No detailed instructions are available.
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*The completed board mounted in a [3D printed enclosure](/Enclosure)*
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## Assembly of readily available modules
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You can also use a ESP based development board and combine this with a M-Bus module. Here are a few boards that have been tested, each one has a dedicated firmware file in the releases section.
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### ESP8266 based boards
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[Wemos D1 mini](https://docs.wemos.cc/en/latest/d1/d1_mini.html)
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- M-Bus connected to GPIO5 (D1)
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- Jump GPIO4 (D2) to GND to force AP mode during boot
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- Dallas temp sensor connected to GPIO14 (D5)
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### ESP32 based boards
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[Wemos D32](https://docs.wemos.cc/en/latest/d32/d32.html)
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- M-Bus connected to GPIO16
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- Jump GPIO4 to GND to force AP mode during boot
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- Dallas temp sensor connected to GPIO14
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[Adafruit HUZZAH32](https://www.adafruit.com/product/3405)
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- M-Bus connected to GPIO16
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Combine one of above board with an M-Bus module. Connect 3.3v and GND together between the boards and connect the TX pin from the M-Bus board to the dedicated M-Bus pin on the ESP board.
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[TSS721 M-BUS module board](https://www.aliexpress.com/item/TSS721/32751482255.html)
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