Microswitches can be soldered either normally open or normally closed, so a microswitch, a battery, a resistor and enough LEDs to light up the space (and Ohm's Law) are all you need.
Microswitches can be soldered either normally open or normally closed, so a microswitch, a battery, a resistor and enough LEDs to light up the space (and Ohm's Law) are all you need.