@@ -6,6 +6,18 @@ It measures the current CO<sub>2</sub> concentration (in ppm), and displays it o
The room should be ventilated as soon as one LED turns red.
## Features
The *CO<sub>2</sub> Ampel* can:
* Display CO2 concentration on LED ring.
* Allow calibration.
* Get current time over NTP
* Send data over MQTT.
* Send data over LoRaWAN.
* Display measurements and configuration on a small website.
* Log data to a CSV file, directly on the ESP flash memory.
## 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*)
