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### The problem
- MH-Z19C CO2 Sensor is connected to ESP32 and integrated in Home Assistant
- Sensor has been outside for 30 Minutes, but it shows 800ppm
- I tried to use a manually triggered Zer…
ar-ml updated
2 months ago
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Hi,
I am usning MH-Z19c sensor on esp8266.
I am getting the same temperature value:
CO2: 672
Temperature: -40
Accuracy: 0
CO2: 675
Temperature: -40
Accuracy: 0
CO2: 682
Temperature:…
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I tried some other library, it's giving wrong value for temperature
Please help me on this.
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Just tried your code and first impression is that it works fine on Pi pico.
Not using my mh_z19C sensor for about a year I forgot the correct wiring of Tx and Rx as described [here](https://github.…
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Hi.
MH-Z19B and MH-Z1C CO2 sensor has, for example, option to turn on/off auto calibration.
Would be great to add it to pmsensor/co2sensor.py.
[mh-z19b-co2-ver1_0.pdf](https://github.com/open-homea…
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### The problem
Ive seen some strange behavior while calibrating this sensor in esphome. Every time when I calibrate the sensor the sensor gets less sensitive. When doing a hardware calibration by …
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Hello
I use esp32 UART to communication with MH-Z19 MH-Z19C
than, I tried the example ErrorCodes and I got message
Sent > DEC: 66 77 9 129 8 200 3 52 1 ERROR Code: 3
Failed to receive CO2 va…
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Hello Damien,
I tried your softuart with two (one at a time) MH-Z19 Co2 sensor [https://www.winsen-sensor.com/d/files/infrared-gas-sensor/ndir-co2-sensor/mh-z19b-co2-manual(ver1_6).pdf](url). _Doesn'…
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@WifWaf I am interested in downloading the firmware using a ST-Link v2.
I found the SWD ports on the schematics at https://revspace.nl/MH-Z19B
4. Firmware
MCU firmware can be easily dumped through …
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