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Dobrica Pavlinušić's random unstructured stuff
MQ: Revision 2
Analog sensors
^ MQ-2 board markings: KS123-35Y00K LM393 ^ MQ-4 board markings: LM-22 LM393 ^ MQ-7 board markings: LM-22 LM393 https://www.instructables.com/id/Arduino-CO-Monitor-Using-MQ-7-Sensor/ |