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and keyboard
Horizontal distance
and machinery
They are designed to drive inductive loads such as relays
From the manufacturer:
MQ-137 NH3 Gas Sensor Module for Ammonia, Carbon monoxide Detector Module Boards Raspberry Pi and keyboardMQ 137 NH3 Gas Sensor Module The MQ137 sensor is a gas sensor module specially designed to detect and sense gases like ammonia (NH3) and carbon monoxide (CO). The MQ 137 gas sensor module is a device that can detect the presence of ammonia (NH3) gas in the air. It is commonly used in applications such as air quality monitors, industrial control systems, and agricultural environments. The MQ 137 sensor operates by using a chemical reaction between the
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