Honeywell Gauge Pressure sensor

Other Hardware Sensors
6

there are several pressure range listed in the datasheet, check the right values for Null and Sensitivity on page 32

sample code, not tested

#define ADC_HONEYWELL 2 // Arduino analog pin

const float Null = 0.50; // Null VDC; datasheet Page 32
const float Sensitivity = 266.6;  // Sensitivity mV/psi; datasheet Page 32

void setup() {
  Serial.begin(9600);
}
void loop() {
  Serial.print("P: ");
  Serial.print(getPressure());
  Serial.println("mbar g");
  delay(5000);
}

float getPressure(void) {
  float pressurePSI,pressureMBAR,pressureVDC;
  int pressure;
  
  pressure = analogRead(ADC_HONEYWELL);
  pressureVDC = (float)pressure * 0.0048828125; // (5/1024 = 0.0048828125)
  pressureVDC = pressureVDC - Null;
  pressurePSI = pressureVDC / Sensitivity * 1000; 
  pressureMBAR = pressurePSI * 68.948;
  
  return pressureMBAR;
}