MH-Z14 and MH-Z19 CO2 Sensors

With CO2 sensors of the MH-Z14 and MH-Z19 series you can monitor the indoor air quality. I show how you how to control the sensors and I check their accuracy.

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Port expander MCP23017

The 16-bit I/O port expander MCP23017 is introduced including a library. The functions are explained by sketches and circuits.

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