【雕爷学编程】Arduino动手做(67)---BMP180气压传感器

37款传感器与执行器的提法,在网络上广泛流传,其实Arduino能够兼容的传感器模块肯定是不止这37种的。鉴于本人手头积累了一些传感器和执行器模块,依照实践出真知(一定要动手做)的理念,以学习和交流为目的,这里准备逐一动手尝试系列实验,不管成功(程序走通)与否,都会记录下来---小小的进步或是搞不掂的问题,希望能够抛砖引玉。

【Arduino】168种传感器模块系列实验(资料+代码+图形+仿真)

实验六十七: GY-68 BMP180 新款 BOSCH温度模块气压传感器(替代BMP085)

BMP180

是博世Sensortec的新数字气压传感器,具有很高的性能,使应用先进的移动设备,如智能手机、平板电脑和体育设备。它遵循了BMP085带来了很多改进,像小尺寸和数字接口的扩张。超低功耗降至3μA使BMP180节电为您的移动设备的领导者。BMP180也是杰出的非常稳定的性能,最好有独立电源供电。BMP180是一款高精度、小体积、超低能耗的压力传感器,可以应用在移动设备中它的性能卓越,绝对精度最低可以达到0.03hPa,并且耗电极低,只有3μA。BMP180采用强大的8-pin陶瓷无引线芯片承载(LCC)超薄封装,可以通过I2C总线直接与各种微处理器相连。

 

BMP180主要特点

压力范围:300~1100hPa(海拔9000米~-500米)

电源电压:1.8V~3.6V(VDDA),1.62V~3.6V(VDDD) VIN需要5V

LCC8封装:无铅陶瓷载体封装(LCC)

低功耗:5μA,在标准模式

高精度:低功耗模式下,分辨率为0.06hPa(0.5米)

高线性模式下,分辨率为0.03hPa(0.25米)

含温度输出

I2C接口

温度补偿

无铅,符合RoHS规范

MSL 1反应时间:7.5ms

待机电流:0.1μA

无需外部时钟电路

 

BMP180技术数据

压力范围300……1100 hPa

均方根噪声中表达压力0.06 hPa typ。(超低功耗模式)

0.02 hPa typ。(超高分辨率模式)

均方根噪声中表达高度0.5 m,typ。(超低功耗模式)

0.17米,typ。(超高分辨率模式)

相对精度的压力

VDD = 3.3 v 950……1050 hPa / hPa±0.12

@ 25°C / m±1.0

700年……900 hPa / hPa±0.12

25…40°C / m±1.0

绝对精度

p = 300…1100 hpa

(温度= 0…+ 65°C,VDD = 3.3。-4.0 V)压力:……+ 2.0 hPa

温度:±1°C,typ。

平均电流消耗(1 Hz刷新率数据)

峰值电流3μA典型(超低功耗模式)

32μA,典型的(高级模式)

650μA,典型的

待机电流1.62……3.6 V

电源电压vddio 1.62……3.6 V

电源电压vdd 1.8……3.6 V

操作温度。

范围全面准确”40…+ 85°C

0…+ 65°C

conv压力。5毫秒,典型的(标准模式)

I2C传输速率3.4 MHz,马克斯。

BMP180典型应用

GPS精准导航(航位推算,上下桥检测等)

室内室外导航

休闲、体育和医疗健康等监测

天气预报

垂直速度指示(上升/下沉速度)

风扇功率控制

体育设备,如高度剖面

 

BMP180气压模块是一款高精度、小体积、低能耗的压力传感器,可以应用在移动设备中,它的性能卓越,绝对精度最低可以达到0.03hPa,并且耗电极低,只有3μA。BMP180采用强大的8-pin陶瓷无引线芯片承载(LCC)超薄封装,可以通过I2C总线直接与各种微处理器相连。

特性曲线

模块电原理图

需要用的 “SFE_BMP180” 库文件如下

SFE_BMP180.h

 

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/*
 
【Arduino】66种传感器模块系列实验(68)
 
实验六十八:BMP180 新款 BOSCH温度模块气压传感器(代替BMP085)
 
SFE_BMP180.h
 
*/
 
 
 
#ifndef SFE_BMP180_h
 
#define SFE_BMP180_h
 
#if defined(ARDUINO) && ARDUINO >= 100
 
#include "Arduino.h"
 
#else
 
#include "WProgram.h"
 
#endif
 
class SFE_BMP180
 
{
 
  public:
 
      SFE_BMP180();
 
      char begin();
 
        shorted?)
 
       
 
      char startTemperature(void);
 
         
 
      char getTemperature(double &T);
 
        startTemperature command
 
         
 
      char startPressure(char oversampling);
 
         
 
      char getPressure(double &P, double &T);
 
        startPressure command       
 
      double sealevel(double P, double A);
 
        weather data)
 
         
 
      double altitude(double P, double P0);
 
        sea-level, runway, etc.)
 
         
 
      char getError(void);
 
         
 
  private:
 
    
 
      char readInt(char address, int16_t &value);
 
         
 
      char readUInt(char address, uint16_t &value);
 
        
 
      char readBytes(unsigned char *values, char length);
 
         
 
         
 
      char writeBytes(unsigned char *values, char length);
 
        subsequent registers)
 
         
 
      int16_t AC1,AC2,AC3,VB1,VB2,MB,MC,MD;
 
      uint16_t AC4,AC5,AC6;
 
      double c5,c6,mc,md,x0,x1,x2,y0,y1,y2,p0,p1,p2;
 
      char _error;
 
};
 
#define BMP180_ADDR 0x77
 
#define BMP180_REG_CONTROL 0xF4
 
#define BMP180_REG_RESULT 0xF6
 
#define BMP180_COMMAND_TEMPERATURE 0x2E
 
#define BMP180_COMMAND_PRESSURE0 0x34
 
#define BMP180_COMMAND_PRESSURE1 0x74
 
#define BMP180_COMMAND_PRESSURE2 0xB4
 
#define BMP180_COMMAND_PRESSURE3 0xF4

  

SFE_BMP180.cp

 

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/*
 
【Arduino】66种传感器模块系列实验(68)
 
实验六十八:BMP180 新款 BOSCH温度模块气压传感器(代替BMP085)
 
SFE_BMP180.cp
 
*/
 
#include <SFE_BMP180.h>
 
#include <Wire.h>
 
#include <stdio.h>
 
#include <math.h>
 
SFE_BMP180::SFE_BMP180()
 
{
 
}
 
char SFE_BMP180::begin()
 
{
 
    double c3,c4,b1;
 
 
 
    Wire.begin();
 
    if (readInt(0xAA,AC1) &&
 
        readInt(0xAC,AC2) &&
 
        readInt(0xAE,AC3) &&
 
        readUInt(0xB0,AC4) &&
 
        readUInt(0xB2,AC5) &&
 
        readUInt(0xB4,AC6) &&
 
        readInt(0xB6,VB1) &&
 
        readInt(0xB8,VB2) &&
 
        readInt(0xBA,MB) &&
 
        readInt(0xBC,MC) &&
 
        readInt(0xBE,MD))
 
    {
 
AC6 = 23153;
 
 
 
Calcs.pdf
 
 
 
25671; AC6 = 18974;
 
        c3 = 160.0 * pow(2,-15) * AC3;
 
        c4 = pow(10,-3) * pow(2,-15) * AC4;
 
        b1 = pow(160,2) * pow(2,-30) * VB1;
 
        c5 = (pow(2,-15) / 160) * AC5;
 
        c6 = AC6;
 
        mc = (pow(2,11) / pow(160,2)) * MC;
 
        md = MD / 160.0;
 
        x0 = AC1;
 
        x1 = 160.0 * pow(2,-13) * AC2;
 
        x2 = pow(160,2) * pow(2,-25) * VB2;
 
        y0 = c4 * pow(2,15);
 
        y1 = c4 * c3;
 
        y2 = c4 * b1;
 
        p0 = (3791.0 - 8.0) / 1600.0;
 
        p1 = 1.0 - 7357.0 * pow(2,-20);
 
        p2 = 3038.0 * 100.0 * pow(2,-36);
 
        return(1);
 
    }
 
    else
 
    {
 
 
 
        return(0);
 
    }
 
}
 
char SFE_BMP180::readInt(char address, int16_t &value)
 
{
 
    unsigned char data[2];
 
    data[0] = address;
 
    if (readBytes(data,2))
 
    {
 
        value = (int16_t)((data[0]<<8)|data[1]);
 
 
 
negative
 
        return(1);
 
    }
 
    value = 0;
 
    return(0);
 
}
 
char SFE_BMP180::readUInt(char address, uint16_t &value)
 
{
 
    unsigned char data[2];
 
    data[0] = address;
 
    if (readBytes(data,2))
 
    {
 
        value = (((uint16_t)data[0]<<8)|(uint16_t)data[1]);
 
        return(1);
 
    }
 
    value = 0;
 
    return(0);
 
}
 
char SFE_BMP180::readBytes(unsigned char *values, char length)
 
{
 
    char x;
 
    Wire.beginTransmission(BMP180_ADDR);
 
    Wire.write(values[0]);
 
    _error = Wire.endTransmission();
 
    if (_error == 0)
 
    {
 
        Wire.requestFrom(BMP180_ADDR,length);
 
while(Wire.available() != length) ;
 
        for(x=0;x<length;x++)
 
        {
 
            values[x] = Wire.read();
 
        }
 
        return(1);
 
    }
 
    return(0);
 
}
 
char SFE_BMP180::writeBytes(unsigned char *values, char length)
 
{
 
    char x;
 
 
 
    Wire.beginTransmission(BMP180_ADDR);
 
    Wire.write(values,length);
 
    _error = Wire.endTransmission();
 
    if (_error == 0)
 
        return(1);
 
    else
 
        return(0);
 
}
 
char SFE_BMP180::startTemperature(void)
 
{
 
    unsigned char data[2], result;
 
 
 
    data[0] = BMP180_REG_CONTROL;
 
    data[1] = BMP180_COMMAND_TEMPERATURE;
 
    result = writeBytes(data, 2);
 
if (result)
 
return(5);
 
    else
 
return(0);
 
}
 
char SFE_BMP180::getTemperature(double &T)
 
{
 
    unsigned char data[2];
 
    char result;
 
    double tu, a;
 
 
 
    data[0] = BMP180_REG_RESULT;
 
    result = readBytes(data, 2);
 
if (result)
 
    {
 
        tu = (data[0] * 256.0) + data[1];
 
 
 
        a = c5 * (tu - c6);
 
        T = a + (mc / (a + md));
 
    }
 
    return(result);
 
}
 
char SFE_BMP180::startPressure(char oversampling)
 
{
 
    unsigned char data[2], result, delay;
 
 
 
    data[0] = BMP180_REG_CONTROL;
 
    switch (oversampling)
 
    {
 
        case 0:
 
            data[1] = BMP180_COMMAND_PRESSURE0;
 
            delay = 5;
 
        break;
 
        case 1:
 
            data[1] = BMP180_COMMAND_PRESSURE1;
 
            delay = 8;
 
        break;
 
        case 2:
 
            data[1] = BMP180_COMMAND_PRESSURE2;
 
            delay = 14;
 
        break;
 
        case 3:
 
            data[1] = BMP180_COMMAND_PRESSURE3;
 
            delay = 26;
 
        break;
 
        default:
 
            data[1] = BMP180_COMMAND_PRESSURE0;
 
            delay = 5;
 
        break;
 
    }
 
    result = writeBytes(data, 2);
 
    if (result)
 
return(delay);
 
    else
 
return(0);
 
}
 
char SFE_BMP180::getPressure(double &P, double &T)
 
sealevel().
 
{
 
    unsigned char data[3];
 
    char result;
 
    double pu,s,x,y,z;
 
 
 
    data[0] = BMP180_REG_RESULT;
 
    result = readBytes(data, 3);
 
if (result)
 
    {
 
        pu = (data[0] * 256.0) + data[1] + (data[2]/256.0);
 
 
 
        s = T - 25.0;
 
        x = (x2 * pow(s,2)) + (x1 * s) + x0;
 
        y = (y2 * pow(s,2)) + (y1 * s) + y0;
 
        z = (pu - x) / y;
 
        P = (p2 * pow(z,2)) + (p1 * z) + p0;
 
    }
 
    return(result);
 
}
 
double SFE_BMP180::sealevel(double P, double A)
 
{
 
    return(P/pow(1-(A/44330.0),5.255));
 
}
 
double SFE_BMP180::altitude(double P, double P0)
 
{
 
    return(44330.0*(1-pow(P/P0,1/5.255)));
 
}
 
char SFE_BMP180::getError(void)
 
 
 
{
 
    return(_error);
 
}

  

模块接线方式

1.先连接芯片与单片机(通过I2C接口),按照如下方式连接

5V—VIN

GND–GND

A5—SCL

A4—SDA

2.然后UNO通过usb与PC电脑连接

3.拷贝后面的代码烧录进Arduino

 

实验开源代码

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/*
 
【Arduino】168种传感器模块系列实验(67)
 
实验六十七:BMP180 新款 BOSCH温度模块气压传感器(代替BMP085)
 
程序之一
 
*/
 
 
 
#include <SFE_BMP180.h>
 
SFE_BMP180 AirPresure;
 
char presureDelayTime;
 
double presureP, presureT;
 
void setup() {
 
  Serial.begin(9600);
 
  AirPresure.begin();
 
}
 
void loop()
 
{
 
  presureDelayTime = AirPresure.startPressure(3);
 
  if (presureDelayTime != 0)
 
  {
 
  delay(presureDelayTime);
 
  presureDelayTime = AirPresure.getPressure(presureP, presureT);
 
  if (presureDelayTime != 0)
 
  {
 
     
 
    Serial.print("Current Preasure: ");
 
    Serial.print(presureP);
 
    Serial.println(" bar");
 
    Serial.print(presureP);
 
    Serial.print(" bar is");
 
    Serial.print(presureP / 1000.0);
 
    Serial.println(" atm");
 
  }
 
  else
 
  {
 
    Serial.println("ERROR");
 
  }
 
  }
 
  else
 
  {
 
  Serial.println("ERROR");
 
  }
 
  delay(1000);
 
}

  

 

复制代码
/*
【Arduino】168种传感器模块系列实验(67)
实验六十七:BMP180 新款 BOSCH温度模块气压传感器(代替BMP085)
程序之二,气温、气压与海拔值可以调整并校准
*/

#include <Wire.h>
#define BMP180ADD 0x77    
                                 
unsigned char OSS;                            

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;            
float temperature;  
double pressure;   
double pressure2;
long b5;          
double altitude;  



void setup()
{
  Serial.begin(9600);
  Wire.begin();
  OSS = 2;  
  BMP180start();
}

void loop()
{
  calculate();
  show();
  delay(1000);
}

void calculate()
{
  temperature = bmp180GetTemperature(bmp180ReadUT());
  temperature = temperature*0.0137;
  pressure = bmp180GetPressure(bmp180ReadUP());
  pressure2 = pressure/115325;
  pressure2 = pow(pressure2,0.29029496);
  altitude = 39*(1+pressure2);                            
}


void show()
{
  Serial.print("气温: ");
  Serial.print(temperature, 1);                            
  Serial.println(" C");
  Serial.print("气压: ");
  Serial.print(pressure, 0);                               
  Serial.println(" Pa");
  Serial.print("海拔:");
  Serial.print(altitude);
  Serial.println("m");
}

void BMP180start()
{                     
  ac1 = bmp180ReadDate(0xAA);                     
  ac2 = bmp180ReadDate(0xAC);  
  ac3 = bmp180ReadDate(0xAE);  
  ac4 = bmp180ReadDate(0xB0);  
  ac5 = bmp180ReadDate(0xB2);  
  ac6 = bmp180ReadDate(0xB4);  
  b1  = bmp180ReadDate(0xB6);  
  b2  = bmp180ReadDate(0xB8);  
  mb  = bmp180ReadDate(0xBA);  
  mc  = bmp180ReadDate(0xBC);  
  md  = bmp180ReadDate(0xBE);
}

short bmp180GetTemperature(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 bmp180GetPressure(unsigned long up)
{
  long x1, x2, x3, b3, b6, p;
  unsigned long b4, b7;
  
  b6 = b5 - 4000;

  x1 = (b2 * (b6 * b6)>>12)>>11;
  x2 = (ac2 * b6)>>11;
  x3 = x1 + x2;
  b3 = (((((long)ac1)*4 + x3)<<OSS) + 2)>>2;
  
  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;
}

int bmp180Read(unsigned char address)
{
  unsigned char data;
  
  Wire.beginTransmission(BMP180ADD);
  Wire.write(address);
  Wire.endTransmission();
  
  Wire.requestFrom(BMP180ADD, 1);
  while(!Wire.available());
    
  return Wire.read();
}

int bmp180ReadDate(unsigned char address)
{
  unsigned char msb, lsb;
  Wire.beginTransmission(BMP180ADD);
  Wire.write(address);
  Wire.endTransmission();
  Wire.requestFrom(BMP180ADD, 2);
  while(Wire.available()<2);
  msb = Wire.read();
  lsb = Wire.read();
  return (int) msb<<8 | lsb;
}

unsigned int bmp180ReadUT()
{
  unsigned int ut;
  Wire.beginTransmission(BMP180ADD);
  Wire.write(0xF4);                       
  Wire.write(0x2E);                       
  Wire.endTransmission();  
  delay(5);                               
  ut = bmp180ReadDate(0xF6);               
  return ut;
}

unsigned long bmp180ReadUP()
{
  unsigned char msb, lsb, xlsb;
  unsigned long up = 0;
  
  Wire.beginTransmission(BMP180ADD);
  Wire.write(0xF4);                        
  Wire.write(0x34 + (OSS<<6));             
  Wire.endTransmission(); 
  delay(2 + (3<<OSS));                     
  
  Wire.beginTransmission(BMP180ADD);
  Wire.write(0xF6);                        
  Wire.endTransmission();
  
  Wire.requestFrom(BMP180ADD, 3); 
  while(Wire.available() < 3);             
  msb = Wire.read();
  lsb = Wire.read();
  xlsb = Wire.read();
  up = (((unsigned long) msb << 16) | ((unsigned long) lsb << 8) | (unsigned long) xlsb) >> (8-OSS);//16 to 19 bit
  return up;
}
复制代码

 

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/*
 
【Arduino】168种传感器模块系列实验(67)
 
实验六十七:BMP180 新款 BOSCH温度模块气压传感器(代替BMP085)
 
程序之三,温度、实时气压、已知海拔计算的海平面的气压、已知海平面气压计算的高度
 
只是算法有点烂,做做实验而已
 
*/
 
 
 
#include <SFE_BMP180.h>
 
#include <Wire.h>
 
SFE_BMP180 pressure;
 
#define ALTITUDE 255.0
 
unsigned long gpstimes;
 
void setup()
 
{
 
Serial.begin(9600);
 
pressure.begin();
 
}
 
void loop()
 
{
 
gpstimes=millis();
 
char status;
 
double T,P,p0,a;
 
status = pressure.startTemperature();
 
delay(status);
 
status = pressure.getTemperature(T);
 
delay(status);
 
Serial.print("temperature: ");
 
Serial.print(T,2);
 
Serial.println(" deg C, ");
 
status = pressure.startPressure(3);
 
delay(status);
 
status = pressure.getPressure(P,T);
 
// Print out the measurement:
 
Serial.print("absolute pressure A: ");
 
Serial.print(P,2);
 
Serial.println(" mb, ");
 
p0=1013.2;
 
a = pressure.altitude(P,p0);
 
Serial.print("computed altitude A: ");
 
Serial.print(a,0);
 
Serial.println(" meters, ");
 
T=25.00;
 
status = pressure.getPressure(P,T);
 
Serial.print("absolute pressure B: ");
 
Serial.print(P,2);
 
Serial.println(" mb, ");
 
p0=1013.2;
 
a = pressure.altitude(P,p0);
 
Serial.print("computed altitude B: ");
 
Serial.print(a,0);
 
Serial.println(" meters, ");
 
gpstimes=millis()-gpstimes;
 
Serial.print("gpstimes=");
 
Serial.println(gpstimes);
 
Serial.println();
 
delay(2000);
 
}

  

posted @   行者花雕  阅读(1445)  评论(0编辑  收藏  举报
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