*CO<sub>2</sub> Ampel* is an open-source project, written in C++ for ESP8266 or ESP32.
*CO<sub>2</sub> Ampel* is an open-source project, written in C++ for [ESP8266](https://en.wikipedia.org/wiki/ESP8266) or [ESP32](https://en.wikipedia.org/wiki/ESP32).
It measures the current CO<sub>2</sub> concentration (in ppm), and displays it on an LED ring.
...
...
@@ -12,11 +12,11 @@ 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.
* Get current time over [NTP](https://en.wikipedia.org/wiki/Network_Time_Protocol)
* Send data over [MQTT](https://en.wikipedia.org/wiki/MQTT).
* Send data over [LoRaWAN](https://en.wikipedia.org/wiki/LoRa#LoRaWAN).
* Display measurements and configuration on a small website.
* Log data to a CSV file, directly on the ESP flash memory.
* Log data to a [CSV](https://en.wikipedia.org/wiki/Comma-separated_values) file, directly on the ESP flash memory.
## Hardware Requirements
...
...
@@ -85,5 +85,4 @@ make upload board=esp32 && make monitor # For ESP32