The -Z19E carbon dioxide sensor (hereinafter referred to as the sensor) is a general-purpose intelligent sensor. It has two products: pin and terminal. It uses the non-dispersive infrared (NDIR) principle to detect CO2 in the air and has good selectivity. No oxygen dependence, long life, etc. The sensor is a high-performance sensor manufactured by closely combining infrared absorption gas detection technology with precise optical circuit design and sophisticated circuit design. High sensitivity, low power consumption Excellent stability Temperature compensation, excellent linear output Provide serial port (UART), PWM waveform and other output methods Long life Anti-vapor interference, no poisoning Application: HVAC equipment Air quality monitoring equipment Fresh air system Air purification equipment Smart home School Parameters: Product model: -Z19E Detection gas: dioxide Supply voltage: DC(5.0 +/- 0.1)V Average current: less than 40mA (@5V power supply) Peak current: 125mA (@5V