Memory Cell

Sensors in Rust forget instantly. A pressure pad only lets power through while someone stands on it, so the moment they step off, the evidence is gone. The memory cell keeps it: a pulse on SET flips its value to 1, a pulse on CLEAR puts it back to 0, and nothing in between changes that.

The circuit: hide a pad in the doorway of your loot room and run its output into SET. Wire a button that only your group can reach to CLEAR. Send the normal output to a flasher light in the airlock and the inverted output to a plain lamp beside it. The cell needs its own power feed too, run with the wire tool like everything else.

You come back from a long monument run. Lamp on, flasher dark: nobody stepped in. Flasher going: someone was in the loot room while you were away, maybe a teammate, maybe somebody who found a way in, so you check before walking through with your kit. One press of the button and the board is clean again.

It takes a Level 2 workbench, the same as the AND switch.