This is the CO2 carbon dioxide sesor module that has three outputs: analog output, digital TTL output, and temperature compensation output.   Features: Size: 32mm x 22mm x 30 mm Chipset"...

This is a breakout board for MQ8, a simple-to-use hydrogen gas sensor, suitable for sensing hydrogen concentrations in the air. The MQ-8 can detect hydrogen gas concentrations anywhere from...

This alcohol sensor is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Sensor provides an analog...

MQ2  flammable gas and smoke sensor detects the concentrations of combustible gas in the air and ouputs its reading as an analog voltage. The sensor can measure concentrations of flammable gas of 300...