เซ็นเซอร์ Infrared Carbon Dioxide co2 MH-Z19C (Terminal)

MH-Z19C NDIR infrared gas module is a common type, small size sensor, using non-dispersive infrared (NDIR) principle to detect the existence of CO2 in the air, with good selectivity, non-oxygen dependent and long life. Built-in temperature compensation; and it has UART output and PWM output. It is developed by the tight integration of mature infrared absorbing gas detection technology, precision optical circuit design and superior circuit design.

Main Features
*Chamber is gold plated
*High sensitivity, low power consumption
*Good stability
*Temperature compensation, excellent linear output
*Multiple output modes: UART, PWM
*Long lifespan
*Anti-water vapor interference, anti-poisoning



Pin:

Vin: Power +(in)

GND: power supply-(GND)

PWM: PWM

Hd: HD (zero calibration, low level is effective for more than 7 seconds)

Rx: UART (RXD) 

Tx: UART (TXD) 

Output method:

PWM output

Assume the measurement range is 400-2000ppm

CO2: Concentration output range: 400-2000ppm

Period: 1004ms±5%

High level output at the beginning of the cycle: 2ms (theoretical value)

Central period: 1000ms±5%

Low level output at the end of the period: 2ms (theoretical value)

Calculation formula for obtaining current CO2 concentration value by PWM: Cppm=2000X (TH-2ms)/(TH+TL-4ms)

Cppm: CO2 concentration value calculated by the unit of ppm

TH: the time when the output is high level in one output cycle

TL: the time when the output is low in one output cycle

Serial output (UART)

Hardware connection, connect the sensor's Vin-GND-RXD-TXD to the user's 5V-GND-TXD-RXD. (User terminal must use TTL level)

Datasheet คลิก  คลิก