Please make sure you have SingleTact Hardware.
The single-element capacitive sensor accurately and reliably quantifies forces and produces superior sensitivity and repeatability over resistive force sensors. It has a repeatability error less than 1% of FSR, is very accurate and easy to use. Only 0.35mm thick, these enable you to collect force and pressure measurements between two surfaces in contact through open source sample code for Arduino and Windows PC application or using a simple Analog 3-wire interface for immediate DAQ integration. Note: Measuring capacitance can be challenging so we recommend that you use the capacitive force sensor electronics board to provide a convenient voltage output and a digital I2C interface.