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

  • This product is available at Banggood, Ebay, Amazon.com.
  • At banggood.com you can purchase MH-Z19 0-5000PPM Infrared CO2 Sensor For CO2 Indoor Air Quality Monitor UART/PWM for only CHF 21.40, which is 41% less than the cost in Amazon.com ($36.55).
  • The lowest price of 1PCS Infrared Carbon Dioxide Sensor MH-Z19 CO2 Detection Sensor Module was obtained on 28 November 2020 2 h 04 min.
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Set Alert for Product: MH-Z19 0-5000PPM Infrared CO2 Sensor For CO2 Indoor Air Quality Monitor UART/PWM - CHF 21.40
Price history for MH-Z19 0-5000PPM Infrared CO2 Sensor For CO2 Indoor Air Quality Monitor UART/PWM
Latest updates:
  • CHF 21.40 - 28 November 2020
  • CHF 17.60 - 22 November 2020
  • CHF 17.71 - 14 November 2020
  • CHF 17.76 - 6 November 2020
  • CHF 26.82 - 30 October 2020
  • CHF 21.29 - 24 October 2020
  • CHF 21.48 - 19 October 2020
  • CHF 21.50 - 13 October 2020
Since: 15 April 2020
  • Highest Price: CHF 27.33 - 28 September 2020
  • Lowest Price: CHF 16.61 - 25 August 2020
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Price history
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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 21.40 - 28 November 2020
  • CHF 17.60 - 22 November 2020
  • CHF 17.71 - 14 November 2020
  • CHF 17.76 - 6 November 2020
  • CHF 26.82 - 30 October 2020
  • CHF 21.29 - 24 October 2020
  • CHF 21.48 - 19 October 2020
  • CHF 21.50 - 13 October 2020
Since: 15 April 2020
  • Highest Price: CHF 27.33 - 28 September 2020
  • Lowest Price: CHF 16.61 - 25 August 2020
Last Amazon price update was: 27 November 2020 2 h 08 min
× Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com (Amazon.in, Amazon.co.uk, Amazon.de, etc) at the time of purchase will apply to the purchase of this product.

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