【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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | /* 【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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 | /* 【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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | /* 【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); } |
/* 【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; }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | /* 【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); } |
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