SHT35を使うためのライブラリ

Files at this revision

API Documentation at this revision

Comitter:
Sigma884
Date:
Sat Jan 12 16:56:56 2019 +0000
Commit message:
A continuous acquisition mode of data was mounted.; The connection confirmation command was mounted.; and other updated.

Changed in this revision

SHT35.cpp Show annotated file Show diff for this revision Revisions of this file
SHT35.h Show annotated file Show diff for this revision Revisions of this file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SHT35.cpp	Sat Jan 12 16:56:56 2019 +0000
@@ -0,0 +1,210 @@
+#include"mbed.h"
+#include"SHT35.h"
+
+mySHT35::mySHT35(I2C &i2cBus, AD0 celect){
+    i2c = &i2cBus;
+    if(celect == AD0_HIGH){
+        _addr = SLV_ADDR_HIGH;
+    }
+    else{
+        _addr = SLV_ADDR_LOW;
+    }
+    SLV_WRITE_SHT = _addr;
+    SLV_READ_SHT  = _addr | 1;    
+    i2c -> frequency(400000);
+}
+/**********
+ヒーターをセットする
+i=0ならば、ヒーターOFF
+i=1ならば、ヒーターON
+セット直後は5msくらい待ってあげる
+**********/
+
+void mySHT35::heaterSet(int i)
+{
+    cmd[0] = 0x30;
+    switch(i){
+      case 0:
+      cmd[1] = 0x66;
+      break;
+      
+      case 1:
+      cmd[1] = 0x6D;
+      break;
+      
+      default:
+      cmd[1] = 0x66;
+    }
+    
+    i2c -> write(SLV_WRITE_SHT, cmd, 2);
+}
+/**************
+温度、湿度を取得する
+このセンサーは温度、または湿度のデータを個別で送ることはできず
+同時に送るので、一応個別に返す関数を作ったが、
+なるべくこっちでまとめて値を取得した方がいいのかも
+**************/
+void mySHT35::getTempHum(float *temp, float *hum)
+{
+    cmd[0] = 0x24;
+    cmd[1] = 0x00;
+    
+    i2c -> write(SLV_WRITE_SHT, cmd, 2);
+    wait_ms(30);
+    i2c -> read(SLV_READ_SHT, buff, 6);
+    
+    val[0] = (unsigned int)buff[0] << 8;
+    val[1] = (unsigned int)buff[1];
+    val[2] = (unsigned int)buff[3] << 8;
+    val[3] = (unsigned int)buff[4];
+    
+    temp_p = (float)(val[0] | val[1]);
+    hum_p  = (float)(val[2] | val[3]);
+    
+    temp_p = temp_p * 175.0 / 65535 - 45.0;
+    hum_p  = hum_p * 100.0 / 65535;
+    
+    if(temp_p > -273 && temp_p < 1000){
+        *temp = temp_p;
+    }
+    if(hum_p > 0 && hum_p < 100){
+        *hum = hum_p;
+    }
+}
+/***********
+温度を取得
+湿度が絶対にいらない場合はこっちで
+************/    
+float mySHT35::getTemp()
+{
+    cmd[0] = 0x24;
+    cmd[1] = 0x00;
+    
+    i2c -> write(SLV_WRITE_SHT, cmd, 2);
+    wait_ms(30);
+    i2c -> read(SLV_READ_SHT, buff, 6);
+
+    val[0] = (unsigned int)buff[0] << 8;
+    val[1] = (unsigned int)buff[1];
+    
+    temp_p = (float)(val[0] | val[1]);
+    temp_p = temp_p * 175.0 / 65535 - 45.0;
+
+    return temp_p;
+}
+/***************
+湿度を取得
+温度が絶対にいらない場合はこちらで
+*****************/
+float mySHT35::getHum()
+{
+    cmd[0] = 0x24;
+    cmd[1] = 0x00;
+    
+    i2c -> write(SLV_WRITE_SHT, cmd, 2);
+    wait_ms(30);
+    i2c -> read(SLV_READ_SHT, buff, 6);
+
+    val[0] = (unsigned int)buff[3] << 8;
+    val[1] = (unsigned int)buff[4];
+    
+    hum_p = (float)(val[0] | val[1]);
+    hum_p = hum_p * 100.0 / 65535;
+
+    return hum_p;
+}
+/*************
+センサーの現在の状態を取得
+何bit目が何を表しているのかは
+データシートを参照
+*************/
+int mySHT35::getState()
+{
+    cmd[0] = 0xF3;
+    cmd[1] = 0x2D;
+    
+    i2c -> write(SLV_WRITE_SHT, cmd, 2);
+    i2c -> read(SLV_READ_SHT, buff, 2);
+    
+    val[0] = (unsigned int)buff[0] << 8;
+    val[1] = (unsigned int)buff[1];
+    
+    state_p = (int)(val[0] | val[1]);
+    if(state_p & 0b1000000000010000){
+        return 1;
+    }
+    else{
+        return state_p;
+        //return 0;
+    }
+}
+
+/****************
+連続計測モード開始
+引数で繰り返し精度を決める
+ 1 : 低
+ 2 : 中
+ 3 : 高
+****************/
+void mySHT35::startContinueMeasure(int accuracy){
+    cmd[0] = 0x27;
+    
+    switch(accuracy){
+        case 1:
+        cmd[1] = 0x2A;  //繰り返し精度:低
+        break;
+        
+        case 2:
+        cmd[1] = 0x21;  //繰り返し精度:中
+        break;
+        
+        case 3:
+        cmd[1] = 0x37;  //繰り返し精度:高
+        break;
+        
+        default:
+        cmd[1] = 0x2A;  //繰り返し精度:低
+    }
+    
+    i2c -> write(SLV_WRITE_SHT, cmd, 2);
+}
+
+/*****************
+連続計測モードデータ取得
+*****************/
+void mySHT35::getContinueTempHum(float *temp, float *hum){
+    cmd[0] = 0xE0;
+    cmd[1] = 0x00;
+    
+    i2c -> write(SLV_WRITE_SHT, cmd, 2);
+    i2c -> read(SLV_READ_SHT, buff, 6);
+    
+    val[0] = (unsigned int)buff[0] << 8;
+    val[1] = (unsigned int)buff[1];
+    val[2] = (unsigned int)buff[3] << 8;
+    val[3] = (unsigned int)buff[4];
+    
+    temp_p = (float)(val[0] | val[1]);
+    hum_p  = (float)(val[2] | val[3]);
+    
+    temp_p = temp_p * 175.0 / 65535 - 45.0;
+    hum_p  = hum_p * 100.0 / 65535;
+    
+    if(temp_p > -273 && temp_p < 1000){
+        *temp = temp_p;
+    }
+    if(hum_p > 0 && hum_p < 100){
+        *hum = hum_p;
+    }
+        
+}
+
+/****************
+連続計測モード停止
+****************/
+void mySHT35::stopContinueMeasure(){
+    cmd[0] = 0x30;
+    cmd[1] = 0x93;
+    
+    i2c -> write(SLV_WRITE_SHT, cmd, 2);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SHT35.h	Sat Jan 12 16:56:56 2019 +0000
@@ -0,0 +1,48 @@
+#ifndef SHT35_H
+#define SHT35_H
+
+#define SLV_ADDR_HIGH   0b10001010
+#define SLV_ADDR_LOW    0b10001000
+
+
+class mySHT35
+{
+public:
+
+        typedef enum AD0{
+            AD0_HIGH = 1,
+            AD0_LOW  = 0
+        } AD0;
+
+        mySHT35(I2C &i2cBus, AD0 celect = AD0_HIGH);
+        
+        void heaterSet(int i);//0ならヒーターOFF,1ならヒーターON
+        
+        void getTempHum(float *temp, float *hum);
+        
+        float getTemp();//二つまとめて受信するのと変わらない
+        
+        float getHum();//上に同じ
+        
+        int getState();
+        
+        void startContinueMeasure(int accuracy);
+        void getContinueTempHum(float *temp, float *hum);
+        void stopContinueMeasure();
+
+
+private: 
+
+        I2C *i2c;
+        char _addr;
+        char SLV_WRITE_SHT;
+        char SLV_READ_SHT;
+        float temp_p, hum_p;
+        unsigned int val[4];
+        char cmd[3], buff[6];
+        int state_p;
+        
+};
+
+#endif
+        
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