* Homeostasis

Temperature, air humidity and soil humidity sensor that communicates via MQTT. The project is implemented using a Wemos D1 mini board with the following components:

- DHT22 temperature and humidity sensor
- FC-28 soil hygrometer sensor
- Battery shield
- 3.7V 1000mAh Lithium battery

The sensor captures the data every 15 minutes and sends it to a MQTT broker and then enters deep sleep, it is important to save power as the device runs off a battery.

#+ATTR_HTML: :width 60%
[[./result.png]]

** Pinout of the board

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[[./pinout.png]]
** Dependencies
- [[https://github.com/adafruit/DHT-sensor-library][Adafruit DHT sensor library]]
- [[https://github.com/adafruit/Adafruit_Sensor][Adafruit Unified Sensor Driver]]
- [[https://github.com/knolleary/pubsubclient][PubSubClient]]
- [[https://github.com/bblanchon/ArduinoJson][ArduinoJSON]]
** Deployment

The software uses the Arduino framework and the development environment of [[https://platformio.org/][PlatformIO]], which offers better tools than the Arduino IDE.

1. Upload the configuration file to the board:

#+begin_src shell
pio run -t uploadfs
#+end_src

2. Compile the project

#+begin_src shell
pio run -t compile
#+end_src

3. Upload firmware

#+begin_src shell
pio run -t upload
#+end_src