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There are some keys on the module including “REC”
What does the Reed Switch Module measure
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Key details include Voltage range: 3
door lock projects
MQ-4 Methane (CH4) Gas Sensor - Analog Module nfc shield There are some keys onDetect Gas Changes with a Practical Air Sensor The Gas Analog CH4 Gas Sensor MQ4 For Arduino is a gas sensor with analog output designed for air quality projects, leak alerts, and ventilation monitoring. It is a practical fit for makers, students, and engineers who want reliable sensor data in embedded builds. Key details include Power supply: 5V; Interface type: Analog; Size: 40x20mm. Important: Most gas and chemical sensors work best after warm up
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