상황
An industrial safety mat uses a force-sensitive resistor (FSR) to detect foot or pressure presence; when pressure is applied, the FSR resistance drops, raising the transistor base voltage and turning on the LED indicator.
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01
Use NPN transistor as threshold switch
02
Add capacitor C1 to debounce mechanical pressure transients
03
Place LED and current-limiting resistor in collector path so transistor saturates cleanly
Reuse this pattern for any pressure or force sensing indicator where a simple discrete threshold switch is preferred over a microcontroller.