force sensor resistor project

Projects General Guidance
1

Hi, I was hoping to tweak an existing force sensor resistor (FSR) project (Using an FSR | Force Sensitive Resistor (FSR) | Adafruit Learning System) by adding a second FSR so I can record measurements from 2 sensors. Do I need a second arduino board, or can I use one board to supply 5V to each FSR and then wire it up similar as in the linked project, with one FSR going into analog 1 and the second one going into analog 2? I am concerned that the resistance reading of one will affect the resistance of the other (and in turn the analog voltage) if I do not have them isolated from one another.

Also, if instead of sending the FSR measurements to the analog pins, is it possible to send the output voltage from the arduino board to a NIDAQ? Will it be in PWM? Thanks.

2

Use two resistors and two FSRs to make two voltage dividers, connected to two analog inputs on one Arduino. Power both dividers by the same 5V supply and connect to the same ground.

Sometimes you get spurious readings when switching analog channels, and it usually helps to throw away the first reading each time after switching.