Metal detector non-contact metal induction detection module soldering wire which spells out the difference

which spells out the difference between black and brown is:

The drive to set the number of steps per motor revolution is 200 (whole step)

the effect is not good

This battery box holder with pin connector

Metal detector non-contact metal induction detection module soldering wire which spells out the differenceYou can use LC Metal detector non contact metal induction detection module as a metal detector. When it approaches any metal, it makes a sound. This is a module specifically designed to detect metal. The module operates by inducing currents in metal objects and responding when it occurs. A nice onboard buzzer signals when it detects something and an onboard potentiometer allow adjustment of sensitivity. The power cables of the Metal detector non