Interface between Arduino Giga and Futek LLB500 Sensor

Other Hardware Sensors
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I have three Futek LLB500 force sensors which I am trying to read from my arduino giga and then display and log the data. These sensors have four wires, Excitiation + and - and then Signal + and -. I currently have my sensor plugged into 5v and ground and then A0 being my S+ and A3 being S-. My sensor value is being read simply by doing:

float intConversionFactor = 2.0 / 1023.0;

  sensor1Value = (analogRead(sensor1Plus) * intConversionFactor) - (analogRead(sensor1Minus) * intConversionFactor);              // Find sensor value from the positive and negative sensor values

For some reason no matter what I do with the sensors I cannot get the values to change when applying a load and my sensor1Value just is jumping around a couple different values in the 0.014 range.

Am I misunderstanding how these sensors should work with them having four wires or what? Because I am very confused why nothing is changing and when I plug it through the calibration equation I was given to get the sensor value to pounds I am nowhere near 0lbs when the sensor is idle.

Thank you!

2

That means the + is the signal to your A/D pin as you have it, but the - must go your Arduino ground so the A/D has some reference for it's reading.

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