Instrumentation setup for SFA experiments. NI USB 6229 DAQ used for data acquisition of change in voltage from the actuator to the voltage divider circuit, later post processed to visualize relative resistance. Air supply channel for both positive and negative pressure with manual valve and regulator. 3-way universal electro valves (yellow dotted lines) are used to control the input pressure using the controller board which actuates the actuator based on the driven square wave signal sequence from the computer. Characterization and experimental setup are described in figure S4.