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Seeed Grove - Physical Sensor Modules - Seeed Studio 101020045, The Grove Carbon Monoxide Sensor from Seeed Studio can measure carbon monoxide in concentrations from 10 to 1000ppm. Its output is a single analogue voltage which can be read by any microcontroller with a spare ADC input and matching supply voltage. The manufacturer's datasheet (available online) has a conversion chart for determining gas concentration given the sensor's reading. Please note that the best preheat time for the sensor is above 24 hours.Seeed provide technical documentation, example projects and software libraries on their product pages. if you require this information please visit this product's page. Seeed 101020045 Grove - Gas Sensor for Carbon Monoxide (MQ-9)