Description

These sensors are ultra accurate since they make use of infrared sensing to detect the CO2 levels.

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Specifications

Product Model: MH-Z19
Size:33 x 20 x 9 mm
Gas: CO2
Voltage: 3.6 ~ 5.5 V DC
Average current: < 18 mA
TTL level: 3.3 V
Output signal: UART / PWM
Preheat time: 3 min
Response Time: T90 < 60 s

Tutorial: https://www.circuits.dk/testing-mh-z19-ndir-co2-sensor-module/