/* Analog input, analog output, serial output Reads an analog input pin, maps the result to a range from 0 to 255 and uses the result to set the pulse width modulation (PWM) of an output pin. Also prints the results to the Serial Monitor. The circuit: - potentiometer connected to analog pin 0. Center pin of the potentiometer goes to the analog pin. side pins of the potentiometer go to +5V and ground - LED connected from digital pin 9 to ground through 220 ohm resistor created 29 Dec. 2008 modified 9 Apr 2012 by Tom Igoe This example code is in the public domain. https://www.arduino.cc/en/Tutorial/BuiltInExamples/AnalogInOutSerial */ // These constants won't change. They're used to give names to the pins used: const int analogInPin = A0; // Analog input pin that the potentiometer is attached to const int analogOutPin = 9; // Analog output pin that the LED is attached to int sensorValue = 0; // value read from the pot float outputValue = 0; // value output to the PWM (analog out) void setup() { // initialize serial communications at 9600 bps: Serial.begin(9600); } void loop() { // read the analog in value: sensorValue = analogRead(analogInPin); // map it to the range of the analog out: float adjusted = 0.098 * sensorValue - 16.56 + 3.58; outputValue = 0.98 * outputValue + 0.02 * adjusted; // print the results to the Serial Monitor: //Serial.print("sensor = "); //Serial.print(sensorValue); //Serial.print("\t output = "); Serial.print(outputValue); Serial.println(" PSI"); // wait 2 milliseconds before the next loop for the analog-to-digital // converter to settle after the last reading: delay(50); }