Can I make this code shorter?
Yes, you can. Look at using arrays.
const int pressureIn1 = A0; // Analog input pin that the potentiometer is attached to
const int pressureOut1 = 5; // Analog output pin that the LED is attached to
const int pressureIn2 = A1; // Analog input pin that the potentiometer is attached to
const int pressureOut2 = 6; // Analog output pin that the LED is attached to
becomes
const int pressureIn[] = { A0, A1 }; // Analog input pins that the potentiometers are attached to
const int pressureOut[] = { 5, 6 }; // Analog output pins that the LEDs are attached to
Similarly, everywhere you read from the pins one at a time, use a for loop to read them together.
int outpoutValue1 = 0; // value output to the PWM (analog out)
int outputValue2 = 0; // value output to the PWM (analog out)
Consistency is good...
You have a lot of global variables that should be local to loop.
{
for(int i = 0; i < medianSize1; i++)
{
rangeValue1[i] = analogRead(pressureIn1);
rangeValue2[i] = analogRead(pressureIn2);
delay(1); //wait between analog samples
}
isort(rangeValue1, medianSize1);
isort(rangeValue2, medianSize2);
}
The outer curly braces are not needed. Get rid of them.