Bon,
ne comprenant pas tout du code que j'utilisais à la base je suis repartis de l'exemple arduino pour le capteur BMP085 et j'ai tapé un peu de code. Mon écriture est surement un peu "lourde" mais elle à le mérite de fonctionner.
L'écriture et certaines variables restent à affiner. Pour ceux que ça interresse:
//Afficher Pression et température capteur BMP085
//Gestion par Attiny85
//LCD 16x2
//SDA pin 5 SCK pin 6
#include <TinyWireM.h>
#define BMP085_ADDRESS 0x77
const unsigned char OSS = 3;
int ac1;
int ac2;
int ac3;
unsigned int ac4;
unsigned int ac5;
unsigned int ac6;
int b1;
int b2;
int mb;
int mc;
int md;
long b5;
short temperature;
long pressure;
long previousMillis = 0;
long tempo = 1000;
long previousPressure = 0;
int vario = 0;
void setup()
{
TinyWireM.begin();
bmp085Calibration();
}
void loop() {
temperature = bmp085GetTemperature(bmp085ReadUT());
pressure = bmp085GetPressure(bmp085ReadUP());
unsigned long currentMillis = millis();
long currentPressure = pressure;
if(currentMillis - previousMillis > tempo) {
int vario = previousPressure - currentPressure;
if (vario <= -30 ){
tone (1,500,700); //si vario < 2,5 m/s
}
if (vario >=8 && vario<12) {
tone (1,1000,500); // si 0,5m/s < vario <1m.s
}
if (vario >=12 && vario<18) {
tone (1,1100,100);
delay (200);
tone (1,1100,100); // si 1m/s < vario <1,5m/s
}
if (vario >=18 && vario<24) {
tone (1,1200,90);
delay (200);
tone (1,1200,90);
delay (200);
tone (1,1200,90); // si 1,5m/s < vario <2m/s
}
if (vario >=18 && vario<24) {
tone (1,1300,80);
delay (150);
tone (1,1300,80);
delay (150);
tone (1,1300,80);
delay (150);
tone (1,1300,80); // si 2m/s < vario <3m/s
}
if (vario >=24 ) {
tone (1,1400,70);
delay (150);
tone (1,1400,70);
delay (150);
tone (1,1400,70);
delay (150);
tone (1,1400,70);
delay (150);
tone (1,1400,70); // si vario > 3
}
previousMillis = currentMillis;
previousPressure = currentPressure;
}
}
void bmp085Calibration() {
ac1 = bmp085ReadInt(0xAA);
ac2 = bmp085ReadInt(0xAC);
ac3 = bmp085ReadInt(0xAE);
ac4 = bmp085ReadInt(0xB0);
ac5 = bmp085ReadInt(0xB2);
ac6 = bmp085ReadInt(0xB4);
b1 = bmp085ReadInt(0xB6);
b2 = bmp085ReadInt(0xB8);
mb = bmp085ReadInt(0xBA);
mc = bmp085ReadInt(0xBC);
md = bmp085ReadInt(0xBE);
}
short bmp085GetTemperature(unsigned int ut)
{
long x1, x2;
x1 = (((long)ut - (long)ac6)*(long)ac5) >> 15;
x2 = ((long)mc << 11)/(x1 + md);
b5 = x1 + x2;
return ((b5 + 8)>>4);
}
long bmp085GetPressure(unsigned long up)
{
long x1, x2, x3, b3, b6, p;
unsigned long b4, b7;
b6 = b5 - 4000;
// Calculate B3
x1 = (b2 * (b6 * b6)>>12)>>11;
x2 = (ac2 * b6)>>11;
x3 = x1 + x2;
b3 = (((((long)ac1)*4 + x3)<<OSS) + 2)>>2;
// Calculate B4
x1 = (ac3 * b6)>>13;
x2 = (b1 * ((b6 * b6)>>12))>>16;
x3 = ((x1 + x2) + 2)>>2;
b4 = (ac4 * (unsigned long)(x3 + 32768))>>15;
b7 = ((unsigned long)(up - b3) * (50000>>OSS));
if (b7 < 0x80000000)
p = (b7<<1)/b4;
else
p = (b7/b4)<<1;
x1 = (p>>8) * (p>>8);
x1 = (x1 * 3038)>>16;
x2 = (-7357 * p)>>16;
p += (x1 + x2 + 3791)>>4;
return p;
}
char bmp085Read(unsigned char address)
{
unsigned char data;
TinyWireM.beginTransmission(BMP085_ADDRESS);
TinyWireM.send(address);
TinyWireM.endTransmission();
TinyWireM.requestFrom(BMP085_ADDRESS, 1);
while(!TinyWireM.available())
;
return TinyWireM.receive();
}
int bmp085ReadInt(unsigned char address)
{
unsigned char msb, lsb;
TinyWireM.beginTransmission(BMP085_ADDRESS);
TinyWireM.send(address);
TinyWireM.endTransmission();
TinyWireM.requestFrom(BMP085_ADDRESS, 2);
while(TinyWireM.available()<2)
;
msb = TinyWireM.receive();
lsb = TinyWireM.receive();
return (int) msb<<8 | lsb;
}
unsigned int bmp085ReadUT()
{
unsigned int ut;
TinyWireM.beginTransmission(BMP085_ADDRESS);
TinyWireM.send(0xF4);
TinyWireM.send(0x2E);
TinyWireM.endTransmission();
// Wait at least 4.5ms
delay(20);
// Read two bytes from registers 0xF6 and 0xF7
ut = bmp085ReadInt(0xF6);
return ut;
}
// Read the uncompensated pressure value
unsigned long bmp085ReadUP()
{
unsigned char msb, lsb, xlsb;
unsigned long up = 0;
// Write 0x34+(OSS<<6) into register 0xF4
// Request a pressure reading w/ oversampling setting
TinyWireM.beginTransmission(BMP085_ADDRESS);
TinyWireM.send(0xF4);
TinyWireM.send(0x34 + (OSS<<6));
TinyWireM.endTransmission();
// Wait for conversion, delay time dependent on OSS
delay(20 + (3<<OSS));
// Read register 0xF6 (MSB), 0xF7 (LSB), and 0xF8 (XLSB)
TinyWireM.beginTransmission(BMP085_ADDRESS);
TinyWireM.send(0xF6);
TinyWireM.endTransmission();
TinyWireM.requestFrom(BMP085_ADDRESS, 3);
// Wait for data to become available
while(TinyWireM.available() < 3)
;
msb = TinyWireM.receive();
lsb = TinyWireM.receive();
xlsb = TinyWireM.receive();
up = (((unsigned long) msb << 16) | ((unsigned long) lsb << 8) | (unsigned long) xlsb) >> (8-OSS);
return up;
}
Il me reste à le tester en vol (la météo ne s'y prêtant pas en ce moment).
Bon vol !!!!