Metal Detector Sensor Module Resistor Based Sensor One of the two little

One of the two little connections on the board's upper surface connects it to the Raspberry Pi

05 Volts Max @ 3

8mm 38 Tooth Spur Gear Size 60x22

and you have a 18650 battery holder

3uf Package  0805 Quantity  2000 Tolerance  10%

Metal Detector Sensor Module Resistor Based Sensor One of the two littleThis is a Metal detector sensor module that utilizes a floating lead of Darlington transistor to detect the touch. There are two LEDs available on the PCB where one is for power indication and the other one illuminates when touch is detected. Features: Main chip: LM393 Working voltage: for DC 5V Single channel signal output Low level output signal used for human body touch sensor alarm Adjustable sensitivity Pin Connector to board: 4 Pins Its make in