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