.. _mhz19b-sample:
MH-Z19B: CO2 Sensor Sample
##########################
Description
***********
This sample application demonstrate the configurations of the MH-Z19B CO2
sensor, then periodically reads CO2 data from the sensor. The driver
currently only support uart interrupt APIs.
Requirements
************
The baudrate of the UART must be configured to 9600, and must support
interrupt driven API.
Building and Running
********************
To build the application, a board with UART interface
has to be chosen, or a custom devicetree overlay has to be provided.
Here Nucleo G0B1RE board is used.
Then, connect the RX and TX from your Zephyr target board to the
MH-Z19B CO2 sensor and power the sensor according to the datasheet.
.. zephyr-app-commands::
:zephyr-app: samples/sensor/mhz19b
:board: nucleo_g0b1re
:goals: build
:compact:
Sample Output
=============
The application will perform runtime configuration of the sensor, then
read back the sensor configuration data. After that it will read the CO2
data every 2 seconds.
.. code-block:: console
Winsen MH-Z19B CO2 sensor application
Configuring sensor - OK
Reading configurations from sensor:
Sensor range is set to 5000ppm
Sensor ABC is enabled
sensor: co2 reading: 758
sensor: co2 reading: 759
sensor: co2 reading: 762
<repeats endlessly every 2 seconds>
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