/MHZ19

[Obsolete Fork] Arduino library for MH-Z19/MH-Z19B CO2 sensor (janky hack for ESP32)

Primary LanguageC++GNU General Public License v3.0GPL-3.0

This janky hack made obsolete by 1.1.0 update to original repo

Mangled fork of MHZ19 library to compile (sort of) for ESP32

Arduino library for MH-Z19/MH-Z19B CO2 sensors.

MHZ19

This library uses software or ESP32 hardware serial to communicate with sensor. Using MHZ19 you can get CO2, temperature and accuracy values (see examples). Only use hw_get_values.ino for ESP32. (References to software serial were removed, this is a hack you probably shouldn't use this)

MHZ19PWM

With this library, you can get CO2 level using a single pin which supports interrupt. MHZ19PWM supports three modes:

MHZ_CONTINUOUS_MODE

In this mode interrupt is always attached, getCO2 method executes without significant delay.

MHZ_DELAYED_MODE

The library attaches interrupt only when getCO2 method is called and detaches it after retrieving a single data package. All code will be delayed up to 2000ms.

MHZ_ASYNC_MODE

In this mode, you can request the data by calling requestData method (at this moment interrupt will be attached) and then check if data are ready without blocking the main loop (isDataReady method). As in the first case getCO2 method executes without significant delay.