Updated README

README.md

@@ -17,12 +17,13 @@ The *CO<sub>2</sub> Ampel* can:
 * Send data over [LoRaWAN](https://en.wikipedia.org/wiki/LoRa#LoRaWAN).
 * Display measurements and configuration on a small website.
 * Log data to a [CSV](https://en.wikipedia.org/wiki/Comma-separated_values) file, directly on the ESP flash memory.
+* Accept many interactive commands.
 
 ## Hardware Requirements
 
 * [ESP8266](https://en.wikipedia.org/wiki/ESP8266) or [ESP32](https://en.wikipedia.org/wiki/ESP32) microcontroller (this project has been tested with *ESP8266 ESP-12 WIFI* and *TTGO ESP32 SX1276 LoRa*)
 * [Sensirion SCD30](https://www.sensirion.com/en/environmental-sensors/carbon-dioxide-sensors/carbon-dioxide-sensors-co2/) "Sensor Module for HVAC and Indoor Air Quality Applications"
-* [NeoPixel Ring - 12](https://www.adafruit.com/product/1643)
+* [NeoPixel Ring - 12](https://www.adafruit.com/product/1643), or [NeoPixel Ring - 16](https://www.adafruit.com/product/1463) (experimental)
 
 See the [documentation](https://transfer.hft-stuttgart.de/gitlab/co2ampel/ampel-documentation) for more info.
 
@@ -67,6 +68,33 @@ make upload board=esp32 && make monitor # For ESP32
 * *Upload*
 * *Tools > Serial Monitor*
 
+## Available commands
+
+In Arduino IDE *Serial Monitor* or PlatformIO *Monitor*, type `help` + <kbd>Enter</kbd> in order to list the available commands:
+
+* `auto_calibrate 0/1` (Disables/enables autocalibration).
+* `calibrate` (Starts calibration process).
+* `calibrate 600` (Starts calibration process, to given ppm).
+* `calibrate! 600` (Calibrates right now, to given ppm).
+* `co2 1500` (Sets co2 level, for debugging purposes).
+* `color 0xFF0015` (Shows color, specified as RGB, for debugging).
+* `csv 60` (Sets CSV writing interval, in s).
+* `format_filesystem` (Deletes the whole filesystem).
+* `free` (Displays available heap space).
+* `local_ip` (Displays local IP and current SSID).
+* `lora 300` (Sets LoRaWAN sending interval, in s).
+* `mqtt 60` (Sets MQTT sending interval, in s).
+* `night_mode` (Toggles night mode on/off).
+* `reset` (Restarts the sensor).
+* `reset_scd` (Resets SCD30).
+* `send_local_ip` (Sends local IP and SSID via MQTT. Can be useful to find sensor).
+* `set_time 1618829570` (Sets time to the given UNIX time).
+* `show_csv` (Displays the complete CSV file on Serial).
+* `timer 30` (Sets measurement interval, in s).
+* `wifi_scan` (Scans available WiFi networks).
+
+The commands can be sent via the Serial interface, from the webpage or via MQTT.
+
 ## Authors
 
  * Eric Duminil (HfT Stuttgart)