The Vernier Excavator: No More Dead Batteries
A clever, automated solution to the world’s most annoying calipers.
We’ve all been there: you finish a project, carefully tuck your digital calipers back into their case, and accidentally nudge the slide. Because most calipers auto-power on when moved—but don't always power off—you’re greeted by a dead battery the next time you need an accurate measurement.
The Vernier Excavator was born out of that exact frustration. It’s a custom-built docking station designed to ensure your tools are actually off when you walk away.
How It Works
When you place your calipers into the custom holder, the system triggers a motorized "excavator" arm. The arm lowers specifically to press the OFF button, guaranteeing your battery is preserved for your next session.

Universal Design: The "bucket" position is fully adjustable, making it compatible with a wide range of caliper brands and sizes.
Set and Forget: Simply dock your tool, and the Arduino-controlled arm handles the rest.

Required parts
(Links to electronic parts in the assembly instructions)

1 x arduino nano no pins
1 x SG90 servo
1 x B103 10k potentiometer
1 x slide switch
1 x micro lever switch
5 M2 x 10mm cap head screws
2 M2 x 20mm cap head screws
Tooth picks - (metal pins can be used if available)
Hookup wire (i use some cat5 )
3 x 10k ohm resistors
Super glue
1mm x 20mm double sided foam tape

The Arduino code : https://gavgetsbored.com/vernier-excavator

Assembly instructions : https://gavgetsbored.com/vernier-excavator

Vernier excavator

0.2mm layer, 2 walls, 15% infill

0.2mm layer, 2 walls, 15% infill