After downloading the library, load the MQ7_Example.ino example sketch onto your device, with analog out connected to A2 GND connected to GND Vin connected to 5V Upload the sketch, and then monitor ...

Much of our past is buried underground. A metal detecting hobby is a fun way to uncover it. I first learned about fascinating metal detector contraptions in 1968 when I joined the Tamaqua Area Coin Cl ...