將bmp280連接到arduino uno

Question

我試圖將BMP280連接到Arduino Uno。但直到現在，我還沒有成功。 我曾嘗試這樣的：利用Adafruit的BMP280庫的例子，bmp280test，我得到錯誤 https://learn.adafruit.com/adafruit-bmp280-barometric-pressure-plus-temperature-sensor-breakout/wiring-and-test

https://community.particle.io/t/issue-with-gy-bmp280-3-3-sensor/28985/2

： 「無法找到有效的BME280傳感器，檢查接線」

我做錯了什麼？

Answer 1

連接插腳以這樣的方式

VCC --> 3.3V 
GND --> GND 
SCK --> A5 
SDI --> A4 

，並嘗試下面的代碼：

#include <Wire.h> 

#define BME280_ADDRESS 0x76 
unsigned long int hum_raw,temp_raw,pres_raw; 
signed long int t_fine; 

uint16_t dig_T1; 
int16_t dig_T2; 
int16_t dig_T3; 
uint16_t dig_P1; 
int16_t dig_P2; 
int16_t dig_P3; 
int16_t dig_P4; 
int16_t dig_P5; 
int16_t dig_P6; 
int16_t dig_P7; 
int16_t dig_P8; 
int16_t dig_P9; 
int8_t dig_H1; 
int16_t dig_H2; 
int8_t dig_H3; 
int16_t dig_H4; 
int16_t dig_H5; 
int8_t dig_H6; 

void setup() 
{ 
    uint8_t osrs_t = 1;    //Temperature oversampling x 1 
    uint8_t osrs_p = 1;    //Pressure oversampling x 1 
    uint8_t osrs_h = 1;    //Humidity oversampling x 1 
    uint8_t mode = 3;    //Normal mode 
    uint8_t t_sb = 5;    //Tstandby 1000ms 
    uint8_t filter = 0;    //Filter off 
    uint8_t spi3w_en = 0;   //3-wire SPI Disable 

    uint8_t ctrl_meas_reg = (osrs_t << 5) | (osrs_p << 2) | mode; 
    uint8_t config_reg = (t_sb << 5) | (filter << 2) | spi3w_en; 
    uint8_t ctrl_hum_reg = osrs_h; 

    Serial.begin(9600); 
    Wire.begin(); 

    writeReg(0xF2,ctrl_hum_reg); 
    writeReg(0xF4,ctrl_meas_reg); 
    writeReg(0xF5,config_reg); 
    readTrim();     // 
} 


void loop() 
{ 
    double temp_act = 0.0, press_act = 0.0,hum_act=0.0; 
    signed long int temp_cal; 
    unsigned long int press_cal,hum_cal; 

    readData(); 

    temp_cal = calibration_T(temp_raw); 
    press_cal = calibration_P(pres_raw); 
    hum_cal = calibration_H(hum_raw); 
    temp_act = (double)temp_cal/100.0; 
    press_act = (double)press_cal/100.0; 
    hum_act = (double)hum_cal/1024.0; 
    Serial.print("TEMP : "); 
    Serial.print(temp_act); 
    Serial.print(" DegC PRESS : "); 
    Serial.print(press_act); 
    Serial.print(" hPa HUM : "); 
    Serial.print(hum_act); 
    Serial.println(" %");  

    delay(1000); 
} 
void readTrim() 
{ 
    uint8_t data[32],i=0;      // Fix 2014/04/06 
    Wire.beginTransmission(BME280_ADDRESS); 
    Wire.write(0x88); 
    Wire.endTransmission(); 
    Wire.requestFrom(BME280_ADDRESS,24);  // Fix 2014/04/06 
    while(Wire.available()){ 
     data[i] = Wire.read(); 
     i++; 
    } 

    Wire.beginTransmission(BME280_ADDRESS); // Add 2014/04/06 
    Wire.write(0xA1);       // Add 2014/04/06 
    Wire.endTransmission();     // Add 2014/04/06 
    Wire.requestFrom(BME280_ADDRESS,1);  // Add 2014/04/06 
    data[i] = Wire.read();      // Add 2014/04/06 
    i++;          // Add 2014/04/06 

    Wire.beginTransmission(BME280_ADDRESS); 
    Wire.write(0xE1); 
    Wire.endTransmission(); 
    Wire.requestFrom(BME280_ADDRESS,7);  // Fix 2014/04/06 
    while(Wire.available()){ 
     data[i] = Wire.read(); 
     i++;  
    } 
    dig_T1 = (data[1] << 8) | data[0]; 
    dig_T2 = (data[3] << 8) | data[2]; 
    dig_T3 = (data[5] << 8) | data[4]; 
    dig_P1 = (data[7] << 8) | data[6]; 
    dig_P2 = (data[9] << 8) | data[8]; 
    dig_P3 = (data[11]<< 8) | data[10]; 
    dig_P4 = (data[13]<< 8) | data[12]; 
    dig_P5 = (data[15]<< 8) | data[14]; 
    dig_P6 = (data[17]<< 8) | data[16]; 
    dig_P7 = (data[19]<< 8) | data[18]; 
    dig_P8 = (data[21]<< 8) | data[20]; 
    dig_P9 = (data[23]<< 8) | data[22]; 
    dig_H1 = data[24]; 
    dig_H2 = (data[26]<< 8) | data[25]; 
    dig_H3 = data[27]; 
    dig_H4 = (data[28]<< 4) | (0x0F & data[29]); 
    dig_H5 = (data[30] << 4) | ((data[29] >> 4) & 0x0F); // Fix 2014/04/06 
    dig_H6 = data[31];         // Fix 2014/04/06 
} 
void writeReg(uint8_t reg_address, uint8_t data) 
{ 
    Wire.beginTransmission(BME280_ADDRESS); 
    Wire.write(reg_address); 
    Wire.write(data); 
    Wire.endTransmission();  
} 


void readData() 
{ 
    int i = 0; 
    uint32_t data[8]; 
    Wire.beginTransmission(BME280_ADDRESS); 
    Wire.write(0xF7); 
    Wire.endTransmission(); 
    Wire.requestFrom(BME280_ADDRESS,8); 
    while(Wire.available()){ 
     data[i] = Wire.read(); 
     i++; 
    } 
    pres_raw = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4); 
    temp_raw = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4); 
    hum_raw = (data[6] << 8) | data[7]; 
} 


signed long int calibration_T(signed long int adc_T) 
{ 

    signed long int var1, var2, T; 
    var1 = ((((adc_T >> 3) - ((signed long int)dig_T1<<1))) * ((signed long int)dig_T2)) >> 11; 
    var2 = (((((adc_T >> 4) - ((signed long int)dig_T1)) * ((adc_T>>4) - ((signed long int)dig_T1))) >> 12) * ((signed long int)dig_T3)) >> 14; 

    t_fine = var1 + var2; 
    T = (t_fine * 5 + 128) >> 8; 
    return T; 
} 

unsigned long int calibration_P(signed long int adc_P) 
{ 
    signed long int var1, var2; 
    unsigned long int P; 
    var1 = (((signed long int)t_fine)>>1) - (signed long int)64000; 
    var2 = (((var1>>2) * (var1>>2)) >> 11) * ((signed long int)dig_P6); 
    var2 = var2 + ((var1*((signed long int)dig_P5))<<1); 
    var2 = (var2>>2)+(((signed long int)dig_P4)<<16); 
    var1 = (((dig_P3 * (((var1>>2)*(var1>>2)) >> 13)) >>3) + ((((signed long int)dig_P2) * var1)>>1))>>18; 
    var1 = ((((32768+var1))*((signed long int)dig_P1))>>15); 
    if (var1 == 0) 
    { 
     return 0; 
    }  
    P = (((unsigned long int)(((signed long int)1048576)-adc_P)-(var2>>12)))*3125; 
    if(P<0x80000000) 
    { 
     P = (P << 1)/((unsigned long int) var1); 
    } 
    else 
    { 
     P = (P/(unsigned long int)var1) * 2;  
    } 
    var1 = (((signed long int)dig_P9) * ((signed long int)(((P>>3) * (P>>3))>>13)))>>12; 
    var2 = (((signed long int)(P>>2)) * ((signed long int)dig_P8))>>13; 
    P = (unsigned long int)((signed long int)P + ((var1 + var2 + dig_P7) >> 4)); 
    return P; 
} 

unsigned long int calibration_H(signed long int adc_H) 
{ 
    signed long int v_x1; 

    v_x1 = (t_fine - ((signed long int)76800)); 
    v_x1 = (((((adc_H << 14) -(((signed long int)dig_H4) << 20) - (((signed long int)dig_H5) * v_x1)) + 
       ((signed long int)16384)) >> 15) * (((((((v_x1 * ((signed long int)dig_H6)) >> 10) * 
       (((v_x1 * ((signed long int)dig_H3)) >> 11) + ((signed long int) 32768))) >> 10) + ((signed long int)2097152)) * 
       ((signed long int) dig_H2) + 8192) >> 14)); 
    v_x1 = (v_x1 - (((((v_x1 >> 15) * (v_x1 >> 15)) >> 7) * ((signed long int)dig_H1)) >> 4)); 
    v_x1 = (v_x1 < 0 ? 0 : v_x1); 
    v_x1 = (v_x1 > 419430400 ? 419430400 : v_x1); 
    return (unsigned long int)(v_x1 >> 12); 
}