which gets output to sensor1, sensor2 and sensor3 under the LCD config.
/*************************************************************
* initialize LCD and display PPO readings
**************************************************************/
lcd.setCursor(0, 1); //sets the cursor to column 0, line 1
inputReading1 = analogRead(sensor1); //getting the voltage reading from the 02 sensor
float voltage1 = inputReading1 * aref_voltage; // converting that reading to voltage
voltage1 /= 1024.0;
lcd.print(voltage1, 2);//print actual voltage to lcd
delay(200);