Hello, i am pretty new to Arduino, and i wanted to try making an Altimeter using a BMP280 and an Oled screen, following this tutorial: https://www.instructables.com/Standalone-Arduino-Altimeter/
Instead of a Nano i used an Uno, and that part seems to work.
The problem is that when the program gets loaded and starts, the bmp initialization fails.
I've tried different BMP280 and they all give the same error.
Here is the code that i am currently using:
#include <BMP280.h>
#include <Wire.h>
#include <U8glib.h>
#define P0 1021.97 //1013.25
BMP280 bmp;
// OLED Type
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NO_ACK);
char sT[20];
char sP[9];
char sA[9];
char sA_MIN[9];
char sA_MAX[9];
double A_MIN = 0;
double A_MAX = 0;
void draw(double T, double P, double A) {
u8g.setFont(u8g_font_unifont);
dtostrf(T, 4, 2, sT);
dtostrf(P, 4, 2, sP);
dtostrf(A, 4, 2, sA);
u8g.drawStr( 5, 10, "Temp: ");
u8g.drawStr( 5, 30, "Bar : ");
u8g.drawStr( 5, 50, "Alt : ");
u8g.drawStr( 50, 10, sT);
u8g.drawStr( 50, 30, sP);
u8g.drawStr( 50, 50, sA);
}
void draw2(double A_MIN, double A_MAX) {
u8g.setFont(u8g_font_unifont);
dtostrf(A_MIN, 4, 2, sA_MIN);
dtostrf(A_MAX, 4, 2, sA_MAX);
u8g.drawStr( 5, 20, "A Min: ");
u8g.drawStr( 60, 20, sA_MIN);
u8g.drawStr( 5, 45, "A Max: ");
u8g.drawStr( 60, 45, sA_MAX);
}
void setup() {
Serial.begin(9600);
if (!bmp.begin()) {
Serial.println("BMP init failed!");
while (1);
}
else Serial.println("BMP init success!");
bmp.setOversampling(4);
u8g.setColorIndex(1);
u8g.setFont(u8g_font_unifont);
}
void loop(void) {
double T, P;
char result = bmp.startMeasurment();
if (result != 0) {
delay(result);
result = bmp.getTemperatureAndPressure(T, P);
if (result != 0) {
double A = bmp.altitude(P, P0);
if ( A > A_MAX) {
A_MAX = A;
}
if ( A < A_MIN || A_MIN == 0) {
A_MIN = A;
}
// Serial.print("T = \t"); Serial.print(T, 2); Serial.print(" degC\t");
// Serial.print("P = \t"); Serial.print(P, 2); Serial.print(" mBar\t");
// Serial.print("A = \t"); Serial.print(A, 2); Serial.println(" m");
u8g.firstPage();
do {
draw(T, P, A);
} while ( u8g.nextPage() );
u8g.firstPage();
delay(1000);
do {
draw2(A_MIN, A_MAX);
} while ( u8g.nextPage() );
u8g.firstPage();
delay(1000);
}
else {
Serial.println("Error.");
}
}
else {
Serial.println("Error.");
}
delay(100);
}
I amp pretty sure that i included all the needed libraries.
Thanks in advance!
Riccardo
