| .. _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> |
