Characterizing the pressure sensor

Characterizing the pressure sensor
The setup for characterizing the pressure sensor includes a dynamic mechanical analysis (DMA; RSA-G2 Solids Analyzer, TA Instruments) to apply and measure the normal force, a digital multimeter (NI-USB 4065 Digital Multimeter) to measure the resistance of the sensor. The measured change in resistance is calibrated with a corresponding applied force. Figure 3A in a publication shows results of tests of linearity, where the pressure follows from forces applied over controlled areas. Figure S8 shows optical images of the experimental set-up.

Characterizing the temperature sensor
The set-up for characterizing the temperature sensor includes a hotplate for controlling the temperature of the sensor and IR camera (FLIR) for measuring temperature as a standard. The device placed on the hotplate and heating to 42°C, and then cooling to room temperature with simultaneous measurement using SCV(our sensor) and IR camera. The measured ADC value from SCV is calibrated with a corresponding measurement using IR camera. Figure 3D shows results of characterization of the temperature sensor.

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