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BME280で気圧等の測定 †更新日 2017-07-17 (月) 16:39:54
H/Wの設定 †秋月電子で購入したBME280で気圧、温度、湿度を自動測定 データシート
raspberry pi とBME280の接続 †------------- 1.VDD 1. 3.3V ------------------------ | BME280 |-----------------------| raspberry pi | | | 2.GND 25.GND | | | |-----------------------| | | | 3.NC | | | |--------- | | | | 4.SDI 3. SDA | | | |-----------------------| | | | 5.SDD 34.GND | | | |-----------------------| | | | 6.SCK 5.SCL | | | |-----------------------| | ------------- -------------------------
インターフェイスの設定(I2Cの有効化) †
接続確認 †
i2c-toolsがインストールされていることを確認 無いときは以下でインストール $ sudo apt-get install i2c-tools
# i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- 76 --
ソフト作成 †bme280の測定部 †10回測定して平均を求める。
#include <stdio.h>
#include <wiringPi.h>
#include <wiringPiI2C.h>
#define BME280_ADDRESS 0x76
unsigned long int hum_raw,temp_raw,pres_raw;
signed long int t_fine;
unsigned int dig_T1;
int dig_T2;
int dig_T3;
unsigned int dig_P1;
int dig_P2;
int dig_P3;
int dig_P4;
int dig_P5;
int dig_P6;
int dig_P7;
int dig_P8;
int dig_P9;
char dig_H1;
int dig_H2;
char dig_H3;
int dig_H4;
int dig_H5;
char dig_H6;
static int dev;
static int init_dev(void)
{
if ((dev = wiringPiI2CSetup(BME280_ADDRESS)) == -1)
{
return 1 ;
}
return 0;
}
void getRegisters(char address, int numData, unsigned char *data) {
char adr;
int i;
adr = address;
for (i = 0; i < numData; i++) {
*data = wiringPiI2CReadReg8 (dev, adr);
// printf("adr:%x data:%x\n",adr, *data);
adr ++;
data ++;
}
}
void readTrim()
{
unsigned char data[32],i=0;
getRegisters(0x88, 24, &data[0]);
i+=24;
getRegisters(0xA1, 1, &data[i]);
i+=1;
getRegisters(0xE1, 7, &data[i]);
i+=7;
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);
dig_H6 = data[31];
}
void writeReg(unsigned char address, unsigned char data) {
char adr;
int i;
adr = address;
wiringPiI2CWriteReg8 (dev, adr, data);
// printf("adr:%x data:%x\n",adr, data);
}
void readData()
{
int i = 0;
unsigned char data[8];
getRegisters(0xF7, 8, &data[0]);
pres_raw = data[0];
pres_raw = (pres_raw<<8) | data[1];
pres_raw = (pres_raw<<4) | (data[2] >> 4);
temp_raw = data[3];
temp_raw = (temp_raw<<8) | data[4];
temp_raw = (temp_raw<<4) | (data[5] >> 4);
hum_raw = data[6];
hum_raw = (hum_raw << 8) | data[7];
// printf("TEMP :%x DegC PRESS :%x hPa HUM :%x \n",temp_raw,pres_raw,hum_raw);
}
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);
}
void main(int argc, char **argv)
{
unsigned char osrs_t = 1; //Temperature oversampling x 1
unsigned char osrs_p = 1; //Pressure oversampling x 1
unsigned char osrs_h = 1; //Humidity oversampling x 1
unsigned char mode = 3; //Normal mode
unsigned char t_sb = 5; //Tstandby 1000ms
unsigned char filter = 0; //Filter off
unsigned char spi3w_en = 0; //3-wire SPI Disable
unsigned char ctrl_meas_reg = (osrs_t << 5) | (osrs_p << 2) | mode;
unsigned char config_reg = (t_sb << 5) | (filter << 2) | spi3w_en;
unsigned char ctrl_hum_reg = osrs_h;
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;
int i;
if(init_dev()==1) return;
writeReg(0xF2,ctrl_hum_reg);
writeReg(0xF4,ctrl_meas_reg);
writeReg(0xF5,config_reg);
readTrim(); //
for(i = 0 ; i < 10 ; i++)
{
delay(1000);
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 + temp_act ;
press_act = (double)press_cal / 100.0 + press_act;
hum_act = (double)hum_cal / 1024.0 + hum_act;
// printf("TEMP :%f DegC PRESS :%f hPa HUM :%f <br /> \n",temp_act,press_act,hum_act);
}
// I calculate ten times of average
temp_act = temp_act/10;
press_act = press_act/10;
hum_act = hum_act/10;
printf("TEMP :%f DegC PRESS :%f hPa HUM :%f %% <br /> \n",temp_act,press_act,hum_act);
}
$ gcc -o bme280-2 bme280-2.c -lwiringPi サーバへのファイル転送等 †
#! /usr/bin/php
<?php
$today = date("Ymd");
$time = date("H:i");
$outfile = '/home/pi/BME280/press_temp';
$outfile2 = '/home/pi/BME280/index.html';
if( $handle = fopen( $outfile , 'a' ) ){
fputs( $handle, $today."-".$time." \n" );
fclose($handle);
}
$cmd = '/home/pi/BME280/bme280-2 >> '.$outfile;
exec($cmd);
$cmd = '/usr/bin/tac '. $outfile . ' > '. $outfile2;
exec($cmd);
$cmd = '/usr/bin/rsync -avz -e ssh '.$outfile2.' okada@192.168.10.46:/var/www/html/ondo/press/';
exec($cmd);
return;
?>
raspberry pi のcrontab †
*/20 * * * * /home/pi/BME280/press.php
45 23 * * * /bin/rm /home/pi/BME280/press_temp サーバの設定 †24時前に日付ファイルに変更 †
#! /usr/bin/php
<?php
$today = date("Ymd").'.html';
$cmd = '/bin/mv /var/www/html/ondo/press/index.html /var/www/html/ondo/press/'.$today;
exec($cmd);
return;
?>
サーバのcrontab †
48 23 * * * /usr/bin/php /home/okada/script/move_press.php > /dev/null 2>&1 実行結果 †グラフ作成 †Jpgraphでグラフを作成 Jpgraphをインストール †からjgraph-4.0.2.tar.gzをDL Linux上の適当なフォルダで解凍
# cd /etc/php5
;;extension=php_gd2.dll extension=php_gd2.dll
# /etc/rc.d/init.d/apache2 restart <?php phpinfo() ?>
プログラム †
<?php
// 折れ線グラフ描画に必要なライブラリ
require_once 'libs/jpgraph.php';
require_once 'libs/jpgraph_line.php';
require_once 'libs/jpgraph_mgraph.php';
$date = trim($_GET["date"]);
// echo $date ;
// データ、凡例、描画色を準備
$dirname = "/var/www/html/ondo/press/";
if ($date == "" ){
$filename = $dirname . "index.html";
$today = date("Ymd");
}else{
$filename = $dirname . $date . ".html" ;
$today = $date;
}
// echo $filename;
$fp = fopen($filename, 'r');
$Time = array();
$rTime = array();
$Pa = array();
$rPa = array();
$i = 0;
while (!feof($fp)) {
$txt = fgets($fp);
if (strlen(trim($tex))==0) bleak;
$S = strpos($txt , '-') + 1;
$E = strpos($txt , 'TEMP');
$tmp1 = trim(substr($txt, $S, $E-$S));
$Time[$i] = $tmp1;
$S = strpos($txt , 'PRESS :') + 7;
$E = strpos($txt , 'hPa');
$tmp2= trim(substr($txt, $S, $E-$S));
$Pa[$i] = $tmp2;
$S = strpos($txt , 'TEMP :') + 6;
$E = strpos($txt , 'DegC');
$tmp2= trim(substr($txt, $S, $E-$S));
$Ta[$i] = $tmp2;
$S = strpos($txt , 'HUM :') + 5;
$E = strpos($txt , '%');
$tmp2= trim(substr($txt, $S, $E-$S));
$Hum[$i] = $tmp2;
// printf("%d %s %s<br /> \n", $i, $Ta[$i], $HUM[$i] );
$i++;
}
fclose($fp);
// exit;
//配列を逆転
$rTime = array_reverse($Time);
$rPa = array_reverse($Pa);
$rTa = array_reverse($Ta);
$rHum = array_reverse($Hum);
$objar = array();
// print_r($Pa);
// グラフの描画先(気圧)
$g1 = new Graph(1200, 600, "auto"); // サイズ
$g1->setScale('textlin'); // 目盛り
$g1->title->setFont(FF_MINCHO, FS_NORMAL, 18); // タイトルフォント
$g1->title->set('気圧 [' . $today . ']'); // タイトル
$g1->legend->setFont(FF_MINCHO, FS_NORMAL, 14); // 凡例フォント
// 気圧の表示
//X軸ラベル
$g1->xaxis->SetTickLabels($rTime);
$g1->xaxis->SetTextLabelInterval(3);
$g1->xaxis->title->Set("Time");
$g1->yaxis->title->Set("(hPa)");
$g1->SetFrame(true,'blue',1);
$l = new LinePlot($rPa); // データ
$l->SetColor('#FFFF00'); // 描画色
$g1->add($l); // 追加
// グラフを描画(気圧)
// $g1->stroke();
array_push($objar, $g1);
// グラフの描画先(温度)
$g1 = new Graph(1200, 600, "auto"); // サイズ
$g1->setScale('textlin'); // 目盛り
$g1->title->setFont(FF_MINCHO, FS_NORMAL, 18); // タイトルフォント
$g1->title->set('温度 [' . $today . ']'); // タイトル
// $g1->legend->setFont(FF_MINCHO, FS_NORMAL, 14); // 凡例フォント
// 温度の表示
//X軸ラベル
$g1->xaxis->SetTickLabels($rTime);
$g1->xaxis->SetTextLabelInterval(3);
$g1->xaxis->title->Set("Time");
$g1->yaxis->title->setFont(FF_MINCHO, FS_NORMAL, 10);
$g1->yaxis->title->Set("(度)");
$g1->SetFrame(true,'blue',1);
$l = new LinePlot($rTa); // データ
$l->SetColor('red'); // 描画色
$g1->add($l); // 追加
// グラフを描画(温度)
// $g1->stroke();
array_push($objar, $g1);
// グラフの描画先(湿度)
$g1 = new Graph(1200, 600, "auto"); // サイズ
$g1->setScale('textlin'); // 目盛り
$g1->title->setFont(FF_MINCHO, FS_NORMAL, 18); // タイトルフォント
$g1->title->set('湿度 [' . $today . ']'); // タイトル
// $g1->legend->setFont(FF_MINCHO, FS_NORMAL, 14); // 凡例フォント
// 湿度の表示
//X軸ラベル
$g1->xaxis->SetTickLabels($rTime);
$g1->xaxis->SetTextLabelInterval(3);
$g1->xaxis->title->Set("Time");
$g1->yaxis->title->Set("(%)");
$g1->SetFrame(true,'blue',1);
$l = new LinePlot($rHum); // データ
$l->setColor('green'); // 描画色
$g1->add($l); // 追加
// グラフを描画(湿度）
// $g1->stroke();
array_push($objar, $g1);
//-----------------------
// Create a multigraph
//----------------------
$mgraph = new MGraph();
$mgraph->SetMargin(20,20,20,20);
$mgraph->SetFrame(true,'darkgray',2);
$mgraph->SetFillColor('lightgray');
$i = 0;
foreach($objar as $g1){
$mgraph->Add($g1,0,600*$i );
$i++;
}
//echo $i;
$mgraph->Stroke();
?>
確認 †すべてのデバイスの表示 †参考 † |
気圧センサー.jpg
設定2.png
設定１.png
