This is a remote controlled robot equipped with a metal detector, a pan&tilt kit camera for live video streaming, GPS, and a compass module to locate his position and detect the direction.
As you can see in the video demonstration, the mobile robot features four wheels which are too small to drive on unpaved roads. This design issue can slow down the robot and spoil your metal detector sensor.
With this robot, you may not be able to detect a treasure, but at least you can detect some screws and wires.
Discoverer remote controlled robot with a Raspberry Pi on custom-build-robots.com
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