Pressure Transducers

/*

Read_Analog_Pressure

*/

//const int P_0_air = 0.53; // analog reading of the pressure transducer at 0psi (Volts)

const int P_0_air = 108; // analog reading of the pressure transducer at 0psi (Volts)

//const int P_0_fuel = 0.58; // analog reading of the pressure transducer at 0psi (Volts)

const int P_0_fuel = 120; // analog reading of the pressure transducer at 0psi (Volts)

//const int P_Max_Air = 2.50; // analog reading of the Air pressure transducer at max psi available (Volts)

const int P_Max_Air = 511.5; // analog reading of the Air pressure transducer at max psi available (Volts)

const int P_Max_Propane = 1.51; // analog reading of the pressure transducer at max psi available in PROPANE (Volts)

const int Max_P_Transducer_150 = 150; // Value of the rated pressure on the 150 pressure transducer (psi)

const int Max_P_Transducer_100 = 100; // Value of the rated pressure on the 150 pressure transducer (psi)

float P_Air = 0; // Current Pressure Value Varibale for Air

float P_Fuel = 0; // Current Pressure Value Varibale for Fuel

void setup() {

// initialize serial communication at 9600 bits per second:

Serial.begin(9600);

}

// the loop routine runs over and over again forever:

void loop() {

//////////////////////////// Pressure Transducers

// read the input on analog pin 0:

float sensorValue_Air = analogRead(A0);

float sensorValue_Fuel = analogRead(A2);

// Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):

float voltage_Air = sensorValue_Air * (5.0 / 1023.0);

float voltage_Fuel = sensorValue_Fuel * (5.0 / 1023.0);

P_Air = ((sensorValue_Air - P_0_air ) / (P_Max_Air - P_0_air )) * Max_P_Transducer_150;

P_Fuel = ((sensorValue_Fuel - P_0_fuel ) / (P_Max_Air - P_0_fuel )) * Max_P_Transducer_150;

// print out the value you read:

Serial.print("Air Pressure: ");

Serial.print(P_Air,1);

Serial.print(", ");

Serial.print(sensorValue_Air);

Serial.print(", ");

Serial.print("Fuel Pressure: ");

Serial.print(P_Fuel);

Serial.print(", ");

Serial.println(sensorValue_Fuel);

}