Fangrui Product Details Fangrui Product Details Fangrui Product Details The Mh-z19c Carbon Dioxide Gas Sensor (hereinafter Referred To As The Sensor) Is A General-purpose Intelligent Small Sensor That Uses The Principle Of Non-dispersive Infrared (ndir) To Detect The Presence Of C02 In The Air. Built-in Temperature Compensation: Simultaneously Has Serial Output, Pwm Output, Easy To Use. The Sensor Is A High-performance Sensor Made By Closely Combining Mature Infrared Absorption Gas Detection Technology With Sophisticated Optical Circuit Design And Sophisticated Circuit Design. Detection Gas:carbon Dioxide Power Supply Voltage:dc (5.00.1) V Average Current:less Than 40ma (@5v Power Supply) Current:125 To (@5v Power Supply) Interface Level:3.3v(compatible With 5v) Measuring Range:400-5000ppm Optional Output Signal:serial Uart(tl Level 3.3v) Warm-up Time:1min Response Time:t90 Less Than 120s Working Temperature:-10-50working Humidity:0-rh(no Condensation) Pin Description: Vin:power +(in) Gnd:power Supply-(gnd) Pwm:pwm Hd:hd (zero Calibration, Low Level Is Effective For