情境
A dancer stepping on a force-sensing resistor changes its resistance, raising the base voltage of an NPN transistor and lighting an LED panel.
這張圖裡有什麼
看懂背後的決策。
01
Use an FSR in a voltage divider with a fixed pulldown resistor to convert pressure into a control voltage.
02
Drive the LED panel with an NPN BJT as a low-side switch.
03
Add a smoothing capacitor across the base pulldown to reduce flicker.
Reusable for interactive floor panels, pressure-sensitive mats, or any design where variable resistance controls an LED or small lamp load.