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Thomas Buck 3 jaren geleden
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 # Giess-o-mat
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+Firmware for automatic plant-watering machine, with web interface, LCD and keypad support, using two MCUs communicating via I2C.
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+
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 For more please also [take a look at Giess-o-mat on my website](https://www.xythobuz.de/giessomat.html).
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 ## Quick Start
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     echo '#define WIFI_SSID "..."' > include/wifi.h
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     echo '#define WIFI_PW "..."' >> include/wifi.h
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-Then simply run the build for all supported configurations with platformio:
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+Then simply run the build for all supported configurations with platformio.
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     pio run
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 You can of course also use pio to flash your targets.
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+## Hardware
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+
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+In general, the project consists of two parts, the controller and the ui.
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+They both communicate via I2C.
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+In my own setup, I'm running the controller on an ESP32, and the UI on an Arduino Nano.
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+It is also possible to run the controller with an ESP8266 or an Arduino instead.
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+You can also run both on one board, but this was up to now only used on Arduino for testing purposes.
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+
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+Of course you need to take care of voltage levels when connecting different boards.
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+I'm running the UI with 5V and the ESP32 is using 3.3V.
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+For safety reasons I added a bi-directional I2C level converter between them.
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+
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+## Details
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+
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+The following targets are defined for this project.
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+
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+| Name          | Board            | Function   | Tested | Usable |
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+| ------------- | ---------------- | ---------- | ------ | ------ |
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+| esp8266_main  | ESP8266          | Controller | No     | ?      |
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+| esp32_main    | ESP32            | Controller | Yes    | Yes    |
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+| arduino_ui    | Arduino Pro      | UI         | Yes    | Yes    |
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+| arduino_test  | Arduino Pro      | Both       | Yes    | No     |
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+| leonardo_main | Arduino Leonardo | Controller | Yes    | Yes    |
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+| leonardo_test | Arduino Leonardo | Both       | Yes    | No     |
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+
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+The "unusable" test targets were only used for easier development.
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+They do not have enough GPIOs for all functionality!
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+
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+ESP8266 should work in theory, as long as the board has enough GPIOs, but I have not tested it.
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+See 'include/config_pins.h' for the GPIO number definitions for the different configurations.
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+Some other options can be set in 'include/config.h'.
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+When an ESP is used, a webinterface and OTA updater will be included as well.
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+For the ESP32, you can upload a new firmware using a webbrowser.
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+Simply use the link on the main page of the web ui, then upload the '.pio/build/esp32_main/firmware.bin' file from the project directory after building.
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+
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 ## License
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     Copyright (c) 2021 Thomas Buck <thomas@xythobuz.de>

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