Here is the circuit diagram of a simple steam sensor, wired around a handful of inexpensive components. This steam sensor can be connected to a microcontroller’s I/O port directly. The steam sensor ...

There are four pins on the MQ-5 Sensor Module, two of which are for VCC and GND. Like the other basic sensor modules, the other two can produce analog and digital data simultaneously. Because the ...

This design resulted from the need for a replacement of the drop sensor in an old vending machine which is no longer in production and therefore hardly obtainable. The replacement is a homemade module ...