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README.md

MH-Z19/MH-Z19B Driver Test

Introduction

This test will test if the MH-Z19 C02 gas sensor is working. The MH-Z19B seems to be newer design which also works with this driver.

Configuration

When testing the UART mode, set TEST_MODE to 1. To test the PWM mode, set TEST_MODE to 2. In UART mode, make sure that TEST_UART points to the interface to use. In PWM mode, make sure to define TEST_PWM.

Expected result

The sensor should continuously (every 1 sec) output the CO2 ppm level. When the sensor is disconnected, it should display a failure message every second.