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

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SUMMARY

The discussion focuses on achieving near-zero resistance in a force sensitive resistor (FSR) when pressure is applied. The original FSR has a resistance of over 1MΩ without pressure, dropping to approximately 480kΩ under pressure. A solution involves using a MOSFET with low on-resistance, where the gate is connected to a voltage divider formed by the pressure sensor and an additional resistor. This configuration allows the circuit to mimic a near-zero resistance state when pressure is applied.

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  • Understanding of force sensitive resistors (FSRs)
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mikepny
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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
 
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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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