MQ-7 (Carbon Monoxide /Gas Sensor) Module

From the shop's description

MQ-7 (Carbon Monoxide /Gas Sensor) Module is a high-quality electronic component designed for Arduino, prototyping, and educational electronics. Carbon monoxide (CO) sensor for simple use, suitable for detection of CO concentrations in air. This is an easy-to-use sensor for detecting Carbon Monoxide (CO), ideal for detecting concentrations of CO in the air.The MQ-7 can detect concentrations in the range of 20 to 2000ppm. The module has an analog output that comes from the voltage divider that forms the sensor and a load resistor. It also has a digital output that is calibrated with a potentiometer, this output has a led indicator. Technical Specification: Operating Voltage: 5V DC Heating Voltage: 5V (high) and 1.4V (low) Load resistance: adjustable Heating resistance: 33 Ohm Warm Up Time: 60s (high) 90s (low) Resistance Consumption: approx. 350mW Oxygen Concentration: 21% It’s perfect for DIY makers, students, and anyone building custom electronic circuits or STEM kits.