Initial code

Signed-off-by: Julien Riou <julien@riou.xyz>

README.md

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+# arduino-sensors-toolkit
+
+This toolkit has been designed to be used with a DHT22 (humidity, temperature) and KY-037 (sound) sensors connected to
+an Arduino microcontroller. It is part of a self hosting project with specific needs. Feel free to fork this repository
+and update code for your needs.
+
+## sensors2serial
+
+Arduino circuit:
+
+![Circuit](static/circuit.svg)
+
+## serial2mqtt
+
+### Requirements
+
+- serial interface using sensors2serial code (ex: /dev/cuaU0 for FreeBSD, /dev/ttyACM0 for Debian)
+- MQTT broker (ex: [Mosquitto](https://www.digitalocean.com/community/tutorials/how-to-install-and-secure-the-mosquitto-mqtt-messaging-broker-on-debian-10))
+
+### Installation
+
+- Installation on [Debian](debian/README.md)
+- Installation on [FreeBSD](freebsd/README.md)
+
+### Configuration
+
+An optional configuration file can be used with `--config <file>`. See [serial2mqtt.ini.example](serial2mqtt.ini.example).
+
+### Usage
+
+```
+python3 serial2mqtt.py --help
+```