self-calibrated CO2 sensor MH-Z19 UART output + PWM up to 5000ppm

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self-calibrated CO2 sensor MH-Z19 UART output + PWM up to 5000ppm

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The MH-Z19 from Winsen is a self-calibrated sensor that measures the concentration of CO2 in the atmosphere. It is a digital sensor capable of delivering a directly readable digital value expressed in ppm. The MH-Z19 has a PWM type digital output. The signal is proportional to the concentration of CO2 in the atmosphere (see below).

Presentation of the self-calibrated MH-Z19 CO2 sensor

The MH-Z19 is a self-calibrated sensor, ie the measurement sent by the sensor does not require any mathematical treatment. In other words, the CO2 content expressed in ppm (parts per million) is recovered. The MH-Z19 has a PWM output and a UART digital interface (serial port). For this tutorial, we will already start by exploiting the PWM output.

Measuring range0 – 5000ppm
Precision± 50ppm+5%
Power supply3.6 ~ 5.5 VDC
Current< 18 mA
Numerical outputsUART and PWM
Heat time3 minutes
Working temperature0 ~ 50 ℃
Working humidity0 – 95% (without condensation)
Dimensions33 mm×20 mm×9 mm (L×W×H)
Weight21g
Lifetime annonced> 5 years

The PWM signal is proportional to the CO2 concentration.

mhz19 pwm signal co2 level

It will therefore be necessary to measure the time during which the signal remains at the high level. Then, the following formula allows to deduce the CO2 rate.

mhz19 pwm calculae co2 concentration

  • Cppm represents the concentration of CO2 in the atmosphere in ppm
  • Th, the time during which the signal remained high
  • Tl, the time during which the signal has remained low

For a 0-5000ppm sensor, simply replace 2000 by 5000 in the formula. The complete documentation is available here.

Tutorials and DIY projects based on the MH-Z19

CO2 detector MH-Z19 deals

MH-Z19 0-5000PPM Infrared CO2 Sensor For CO2 Indoor Air Quality Monitor UART/PWM
CHF 24.99
New MH-Z19B Infrared Carbon Dioxide CO2 Monitor Sensor Module UART PWM Output
$28.99
  • This product is available at Banggood, Ebay.
  • At banggood.com you can purchase MH-Z19 0-5000PPM Infrared CO2 Sensor For CO2 Indoor Air Quality Monitor UART/PWM for only CHF 24.99, which is 14% less than the cost in Ebay ($28.99).
  • The lowest price of New MH-Z19B Infrared Carbon Dioxide CO2 Monitor Sensor Module UART PWM Output was obtained on 22 October 2021 3 h 04 min.
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Price history for MH-Z19 0-5000PPM Infrared CO2 Sensor For CO2 Indoor Air Quality Monitor UART/PWM
Latest updates:
  • CHF 24.99 - 18 September 2021
  • CHF 18.99 - 31 August 2021
  • CHF 35.99 - 29 May 2021
  • CHF 31.31 - 24 February 2021
  • CHF 28.99 - 8 February 2021
  • CHF 15.99 - 1 February 2021
  • CHF 14.99 - 22 January 2021
  • CHF 22.99 - 18 January 2021
Since: 30 October 2020
  • Highest Price: CHF 35.99 - 29 May 2021
  • Lowest Price: CHF 14.99 - 22 January 2021

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