MH-Z19

MH-Z19 copied to clipboard

library fails with CORE_DEBUG_LEVEL=3

1

## Overview The library fails when the debug level is increased, when you define `CORE_DEBUG_LEVEL=3` for example, its necessary pass the TAG like this: `'-D TAG_MHZ19="MHZ19"'` on PlatformIO ini file...

hpsaturn

Getting wrong temperature on MH-z19c

7

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:...

vignesh8458

ERROR 3 after powercycle - firmware download blocks init

3

Hi, so i have an ATTiny1614 (16kB Flash, 2kB RAM) with megaTinyCore, a 4-digit serial display and the MHZ-19C. I'm using hardware serial to save memory. When i flash the...

Knochi

Backup / Restore Firmware using ST-Link v2 and OpenOCD

3

@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...

stefan123t

Reasoning behind sensor zero-calibration ?

1

Hi there, I don't know if the question is about the library or about the sensor itself. I am using the method `calibrate ();` to calibrate the sensor but it...

etodorovich

added int return value

1

added int return value to verify and begin functions to check if sensor connection failed. I found it useful to have some indication whether a sensor might be attached or...

lefty01

Incorrect PPM range with sensor

1

Hi, so I've started playing with this library, and I'm confused a little about range which .getCO2() returns. My MH-Z19B has a sticker which states 0-5000ppm. I've called getRange(), it...

ccloned

Error Code 3

6

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...

icsHaLl

Cannot connect the sensor properly

5

I used an Arduino Micro and just used your example code and connected the sensor like this: - 5V (Arduino) to Vin (MH-Z19B) - GND to GND - Rx (Arduino)...

vinzenzwolf1

Failed communication via UART (ESP32)

3

Hi everyone, I'm using ESP32 with MHZ19B co2 sensor. I've changed the BasicUsage sketch to use HardwareSerial 2. After wiring everything the result was: co2: 0 temperature: -17 

edomazzone