Diff: SHT3x.cpp

Revision:

2:e87793cb9185

Child:

3:16d45bca7580

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SHT3x.cpp	Sun Nov 19 13:16:35 2017 +0000
@@ -0,0 +1,125 @@
+#include"mbed.h"
+#include"SHT3x.h"
+
+//Serial pc(USBTX, USBRX); //tx, rx
+
+mySHT3x::mySHT3x(I2C &i2cBus, AD0 celect){
+    i2c = &i2cBus;
+    if(celect == AD0_HIGH) _addr = SLV_ADDR_HIGH;
+    else _addr = SLV_ADDR_LOW;
+    SLV_WRITE = _addr;
+    SLV_READ  = _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 mySHT3x::heater_set(int i)
+{
+    char cmd[2][2];
+    cmd[0][0] = 0x30;cmd[0][1] = 0x66;
+    cmd[1][0] = 0x30;cmd[1][1] = 0x6D;
+    
+    i2c->write(SLV_WRITE, cmd[i], 3);
+}
+/**************
+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 mySHT3x::get_temp_hum(float *temp, float *hum)
+{
+    char cmd[2] = {0x24,0x00};
+    char buff[6];
+    unsigned int val[4];
+    
+    i2c->write(SLV_WRITE, cmd, 2);
+    wait_ms(30);
+    i2c->read(SLV_READ, 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 = (float)(val[0] | val[1]);
+    *hum  = (float)(val[2] | val[3]);
+    
+    *temp = *temp*175.0/65535-45.0;
+    *hum  = *hum*100.0/65535;
+}
+/***********
+温度を取得
+湿度が絶対にいらない場合はこっちで
+************/    
+float mySHT3x::get_temp()
+{
+    char cmd[2] = {0x24,0x00};
+    char buff[6];
+    unsigned int val[2];
+    float temp;
+    
+    i2c->write(SLV_WRITE, cmd, 2);
+    wait_ms(30);
+    i2c->read(SLV_READ, buff, 6);
+
+    val[0] = (unsigned int)buff[0]<<8;
+    val[1] = (unsigned int)buff[1];
+    
+    temp = (float)(val[0] | val[1]);
+    temp = temp*175.0/65535-45.0;
+
+    return temp;
+}
+/***************
+湿度を取得
+温度が絶対にいらない場合はこちらで
+*****************/
+float mySHT3x::get_hum()
+{
+    char cmd[2] = {0x24,0x00};
+    char buff[6];
+    unsigned int val[2];
+    float hum;
+    
+    i2c->write(SLV_WRITE, cmd, 2);
+    wait_ms(30);
+    i2c->read(SLV_READ, buff, 6);
+
+    val[0] = (unsigned int)buff[3]<<8;
+    val[1] = (unsigned int)buff[4];
+    
+    hum = (float)(val[0] | val[1]);
+    hum = hum*100.0/65535;
+
+    return hum;
+}
+/*************
+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 mySHT3x::get_state()
+{
+    char cmd[2] = {0xF3, 0x2D};
+    char buff[2];
+    unsigned int val[2];
+    int state;
+    
+    i2c->write(SLV_WRITE, cmd, 2);
+    i2c->read(SLV_READ, buff, 2);
+    
+    val[0] = (unsigned int)buff[0]<<8;
+    val[1] = (unsigned int)buff[1];
+    
+    state = (int)(val[0] | val[1]);  
+
+    return state;
+}
+    
+