This force-sensing resistor (FSR) from Interlink Electronics is a passive component that exhibits a decrease in resistance when there is an increase in the force applied to the 0.58″-diameter (1.5 cm) active area, allowing you to create a sensor that is able to detect force or pressure.
1.Size: 0.58″-diameter (1.5 cm) is active area
2.Resistance range:100KΩ (light pressure) to 200Ω (max. pressure)
3.Force range: 0 to 20 lb. (0 to 100 Newtons) applied evenly over the 0.125 Sq in surface area
4.Power supply: Uses less than 1mA of current (depends on any pullup/down resistors used and supply voltage)