MG-811 Carbon Dioxide Sensor Module CO2 Sensor Module MG811 Module Analog Output Voltage 0-2V Gas Sensor Module    Product Description:    1: Wide range of applications    2: high sensitivity    3: Simple to use    4: Long service life    5: Dual signal output: analog output, TTL digital level output        This sensor module features an onboard MG-811 gas sensor and circuitry, ready to use out of the box.    This MG811 sensor module is a bit special in that it requires 6VDC to function properly.    There is an onboard signal conditioning circuit for amplifying the output signal and an onboard heating circuit for heating the sensor.    MG-811 is highly sensitive to CO2 and less sensitive to alcohol and CO.    Can be used for air quality control, fermentation process, indoor air monitoring applications. The output voltage of the module decreases as the CO2 concentration increases.        Features:    1. Equipped with MG811 carbon dioxide CO2 gas sensor    2. The working voltage must be 6VDC    3. Dual signal output: analog output, TTL digital level output    4. The onboard LED is active low, when the digital TTL output valid signal is low, the LED is activated.    5. Can be connected to microcontrollers such as Ad    6. Analog output: 0& 65374;2V    7. Dimensions: 35mm x 21mm x 28mm (LxWxH)    8. Weight: 11g        Packing list:    1*MG811 carbon dioxide sensor module