MH-Z19b

ESP32 with CO2-Sensor (MH-Z19B) and publish data on mydevice Cayenne

Hardware:

1. Lolin D32 (with ESP32 4MB and WIFI) https://wiki.wemos.cc/products:d32:d32
2. MH-Z19B - CO2 - Sensor https://www.winsen-sensor.com/sensors/co2-sensor/mh-z19b.html

Wireing:

MH-Z19b		Lolin D32
GND	<->	GND
VI V	<->	BAT
RX	<->	SDA Pin 21
TX	<->	SCL Pin 22

Implementation

• Registration at https://accounts.mydevices.com
• Add new Device -> select "Bring your own Thing"
• Copy the credentials MQTT - Name / Password and Device-ID from Webpage into the code
• flash and run the code -> Cayonne will create channals automatically
• create a Slider on channel 4 to manipulate the transfer frequency (new Widget - Slider Controller)
  • Data Analog = Acturator / Unit = Anlalog / Channel = 4 / Min = 5 / Max = 60