// Pressure sensor program - zahra almukhariq - fab academy 2019

#include <SoftwareSerial.h>
#define RX 0
#define TX 1
SoftwareSerial mySerial(RX, TX);

const int SensorPin = A0;  // Analog input pin 
int sensorValue = 0;       // value read from the sensor
float outputValue = 0;     // value output 
float pressurevalue = 0;   // value of pressure


void setup() {
  // initialize serial communications at 9600 bps:
  mySerial.begin(9600);
  mySerial.print("begin ");
}

void loop() {
  // read the analog in value:
  sensorValue = analogRead(SensorPin);
  // convert the reading to voltage:
  outputValue = sensorValue * (5 / 1023.0);
  // convert from voltage to pressre:
  pressurevalue = ((outputValue - 2.5) / 0.090);

  // output the results to the Serial Monitor:
  mySerial.print("voltage = ");
  mySerial.print(outputValue);
  mySerial.print("\t pressure value = ");
  mySerial.println(pressurevalue);

  // wait 2 milliseconds before the next loop for the analog-to-digital
  // converter to settle after the last reading:
  delay(2);
}