BMP180 Return same altitude value

Using Arduino Sensors
1

Hi, I am using BMP180 for a project. In the code I provide initial altitude for the program to measure pressure. But when I want to get back value of altitude it returns the same value.

My question is,

Isn't it possible to measure altitude with BMP180, if it is can use please help me with the code of the program?

#include <Wire.h> //Including wire library

#include <SFE_BMP180.h> //Including BMP180 library

#define ALTITUDE 35 //Altitude where I live (change this to your altitude)

SFE_BMP180 pressure; //Creating an object

void setup() {
Serial.begin(9600); //Starting serial communication

Serial.println("Program started");

if (pressure.begin()) //If initialization was successful, continue
Serial.println("BMP180 init success");
else //Else, stop code forever
{
Serial.println("BMP180 init fail");
while (1);
}
}

void loop() {
char status;
double T, P, p0, altitude_; //Creating variables for temp, pressure and relative pressure

Serial.print("You provided altitude: ");
Serial.print(ALTITUDE, 0);
Serial.println(" meters");

status = pressure.startTemperature();
if (status != 0) {
delay(status);

status = pressure.getTemperature(T);
if (status != 0) {
Serial.print("Temp: ");
Serial.print(T, 1);
Serial.println(" deg C");

status = pressure.startPressure(3);

if (status != 0) {
delay(status);

status = pressure.getPressure(P, T);
if (status != 0) {
Serial.print("Pressure measurement: ");
Serial.print(P); //absolute pressure -- P
Serial.println(" hPa (Pressure measured using temperature)");

p0 = pressure.sealevel(P, ALTITUDE); //sealevel pressure -- p0
Serial.print("Relative (sea-level) pressure: ");
Serial.print(p0);
Serial.println("hPa");

altutude_= 44330 * (1 - pow((P/p0), (1/5.255)));
Serial.print("Altitude: ");
Serial.print(hundurluk);
Serial.println(" meterino");
}
}
}
}
delay(1000);
}

2

Please use code tags when posting code, as described in the "How to use this forum" post, at the head of every forum topic.

Since that code won't compile, post the code you are actually using (edit your first post and add code tags).

In the meantime, think about how these three lines are supposed to work.

          altutude_= 44330 * (1 - pow((P/p0), (1/5.255)));
          Serial.print("Altitude: ");
          Serial.print(hundurluk);
3

To measure altitude with a barometer requires calibration for the current state of the atmosphere, but
these devices have high resolution and easily sense the difference in pressure if lifted or lowered a metre or so. Repeatability and absolute accuracy are issues though.