WifWaf

Firmware updates changed the behaviour of the getBackgroundCO2() function (and getTemperature()). Previously, it would store a static variable of 400 ppm which represented the assumed background ppm zeroing was equivalent...

ESP_LOGX and the TAG_MHZ19 definition, both require the ESP32 definition to be set, so that's quite odd. It might be worth moving the lines below to the top of the...

It sounds as if the UART data is going out of sync, however, the library should handle this. Have you anyway to check the UART signal integrity? If not, have...

Cheers for the info! If I am understanding correctly, the serial output is from the sensor on start-up? Have you tried sending 'a' to abort it? Also, just to clarify,...

Cheers for the info. I've downloaded the firmware previously also, however, I couldn't get it to upload successfully. Have you had success here? I know little about reverse engineering firmware,...

This is due to the newer version of the sensor, the manufacturer shuffles the registries around and I'm currently not sure the best way to go about fixing these types...

This should have been fixed in https://github.com/WifWaf/MH-Z19/commit/04a6f85f980cae100f6c9472a1bbe484cc10dd3c. I'll add a new release shortly. I only have two sensors to test the changes on, so hoping I'm correct in that it...

> I have a similar issue with MH-Z19 > > CO2 (ppm): 0 !Error: Timed out waiting for response Temperature (C): -17 > > The product is this. https://www.aliexpress.com/item/32706795833.html (the...