FSRs are basically a resistor that changes its resistive value (in ohms Ω) depending on how much it is pressed.  
The FSR is made of 2 layers separated by a . The more one presses, the more of those Active Element dots touch the semiconductor and that makes the resistance go down.
Suggest you to connect it series with a 1k ohm resistor, so that you can detect the voltage so that you can calculate its resistance.

Features:
– No load resistance: >1000kOhm
– Load resistance: <1kOhm @50N
– Working Voltage VCC: 5.5 VDC(MAX)
– Working Current: 5 mA(MAX)
– Pressure Scale: 0-50N
– Response time:  < 10ms
– Recovery Time:  < 40ms
– Sensing area diameter: 9mm
– Total length: 40mm

General
Brand OPEN-SMART
Model N/A
Quantity 1 piece
Form Color Black + Transparent White
Material Alloy + Plastic
Specification
Application Detecting the pressure
Working Voltage 5.5V
English Manual / Spec Yes
Download https://drive.google.com/drive/folders/0B6uNNXJ2z4CxRFVUXzMtRHc1TDg?usp=sharing

Dimensions & Weight

Dimensions

1.61 in x 0.39 in x 0.04 in (4.1 cm x 1 cm x 0.1 cm)

Weight

0.01 oz (0.16 g)

Packing List

1 x Sensor

All packages from DX.com are sent without DX logo or any information indicating DX.com. Due to package variations from suppliers, the product packaging customers receive may be different from the images displayed.


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