상황
A pressure-sensitive LED doormat activates individual LEDs when stepped on; each cell contains a normally-open pressure switch, series resistor, and LED.
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01
Use SPST pressure switches in parallel branches to isolate each sensor zone
02
Add 330Ω current-limiting resistors to protect LEDs
03
Power from a 9V battery with common ground return
Suitable for interactive floor mats, step counters, or pressure-activated signage needing simple discrete zone detection.