I have just finished my compacted pressure sensor. it uses a phot laser passing through invs, aimed at a solar panel. this does not set off the solar panel, as the phot is converted to neut as it passes through the invs. When pressure is applied, the invs stops converting phot into neut, setting off the solar panel, which then turns the lcd display red. (the reset button is at the top of the device.
Improvements being made- 1. a full lcd container, H=hswc S=Swch HSHSHSHS 2. an auto reset. feel free to upgrade my terrible deco skills and convo me a better version.