Download Arduino IDE

– untar and run
– run IDE and install the ESP32 Board

In your Arduino IDE, go to FilePreferences

Enter into the “Additional Board Manager URLs” field as shown in the figure below. Then, click the “OK” button.

If other Boards are present you can seperate list with comma:,

Open the Boards Manager. Go to Tools > Board > Boards Manager
Search for ESP32 and press install button for the ESP32 by Espressif Systems.

Plug the ESP32 board to your computer. With your Arduino IDE open, follow these steps.
tail -f /var/log/syslog
Nov 11 10:35:29 OlisUbuntu kernel: [ 5741.868594] usbserial: USB Serial support registered for cp210x
Nov 11 10:35:29 OlisUbuntu kernel: [ 5741.868630] cp210x 1-7.1:1.0: cp210x converter detected
Nov 11 10:35:29 OlisUbuntu kernel: [ 5741.869034] usb 1-7.1: cp210x converter now attached to ttyUSB0

1. Select your Board in Tools > Board menu (in my case it’s the DOIT ESP32 DEVKIT V1)
2. Select the Port

3. Open the following example under File > Examples > WiFi (ESP32) > WiFiScan
4. A new sketch opens in your Arduino IDE
5. Press the Upload button in the Arduino IDE. Wait a few seconds while the code compiles and uploads to your board.
I´ve got the message:
exec: „python“: executable file not found in $PATH

apt install python-is-python3 python3-serial
Then i had to read: Permission denied: ‚/dev/ttyUSB0‘
vi /etc/udev/rules.d/01-ttyusb.rules
add: SUBSYSTEMS==“usb-serial“, TAG+=“uaccess“
udevadm control –reload
replug the ESP and now we are runnin.
open Tools -> Serial Monitor and set to 9600 baud and the magic happens 🙂

Goto Tools -> Manage Libraries and install:
Adafruit GFX Library
Adafruit NeoPixel


Connect module’s HD pin to low level(0V), lasting for 7 seconds at least.
Push the Button for 7 seconds at least.

Before calibrating the zero point, please ensure that the sensor is stable for more than 20 minutes at 400ppm ambient environment.


Mond-Schaltplan als PDF




MH-Z19 Pinout Cable
Pin Function
1 HD
2 Analog Output Vo
3 Negative Pole(GND)
4 Positive Pole(Vin)
5 UART(RXD)TTL Level data input
6 UART(TXD)TTL Level data output

AZDelivery 5V RGB LED Ring WS2812B

AZDelivery 0,96 Zoll OLED Display I2C


ESP-32 Dev Kit C V2


Sketch (click to download) – CO2-Ampel-NodeMCU-Wroom-Mh-Z19-Oled-LED-BMP280-NoWeb

Sketch (click to download) – CO2-Ampel-NodeMCU-Wroom-Mh-Z19-Oled-LED-BMP280-WebAutoConnect
After connected you can destroy the configuration with /_ac

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