A spoof EMF detector that lights up based on how hard you push the button. Fun for cosplays etc!
If you want a fully assembled one, you can get one at tindie: https://www.tindie.com/products/shibetek/ghostometer-owometer-spoof-emf-meter/
See it in action: https://www.youtube.com/watch?v=4me_C-GhTzw
How to make a pressure sensor:
- Take a small square of velostat
- Strip the ends of thin copper wires and fan out the wires.
- Sandwich the velostat between the wires
- Wrap put tape on the top and bottom to prevent the wires from sliding around
- Glue the wires to the insert plate in such a way that only the exposed copper parts of the wire gets pushed against the velostat when you push the button.