Hey guys I am trying to measure barometric pressure and altitude with a MPX4115A sensor using this code:
float T0, mmHg, P0, H0, z, R, g, voltage, pressure, altitude;
int led = 13;
int analog0 = 0;
void setup(){
pinMode(13, OUTPUT);
Serial.begin(9600);
}
void loop(){
digitalWrite(led, LOW);
T0=287.57;//Reference Temperature (K)
P0=104000.45;//Reference Pressure (Pa)
H0=45;//Reference altitude (m)
z=(-0.0065);//constant(K/m)
R=287.06;//constant (J/kg*K)
g=9.81;//gravitational acceleration (m/s^2)
analog0 = analogRead(A0);
voltage = ((float)analog0)*(5/1023);
pressure = ((22.222*voltage+10.556)*1000);
altitude = (T0/z)(pow(pressure/P0,(-zR)/g)-1)+H0;
Serial.print("Analog0: ");
Serial.println(analog0);
Serial.print("Pressure: ");
Serial.println(pressure);
Serial.print("Altitude: ");
Serial.println(altitude);
digitalWrite(led, HIGH);
delay(2000);
}
The pressure I'm getting is around 10556.00 Pascals, which is a tenth of the real pressure...
Can someone tell me what is wrong in this code or maybe show me an alternative code?
Thank you!
EDIT: Found the error 