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How to achieve a zero resistance on a force sensitive resistor?

  1. Mar 27, 2013 #1
    Hi all,
    I've a square force sensitive resistor with a resistance larger than 1MΩ when no pressure is applied. When I apply pressure with my hand, the resistance drops to about 480kΩ
    I'd like to know if there is a way to make the resistance drop to almost 0Ω when any pressure is applied and return to normal when the pressure is released?
    Thanks
     
  2. jcsd
  3. Mar 27, 2013 #2
    You aren't going to be able to change the characteristics of the sensor but you can add a circuit that appears like approximately zero ohms when pressure is applied. I would start with a mosfet with a low on resistance, with the gate connected to a voltage divider of the pressure sensor and a resistor. The pressure sensor should be between the gate and Vcc.
     
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