Diff: HeptaTemp.cpp

Revision:

0:f74735cb01bc

Child:

1:a23c2cd65379

diff -r 000000000000 -r f74735cb01bc HeptaTemp.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HeptaTemp.cpp	Thu Jul 20 02:15:14 2017 +0000
@@ -0,0 +1,58 @@
+#include"HeptaTemp.h"
+#include"mbed.h"
+
+HeptaTemp::HeptaTemp(PinName pin) : _pin(pin)
+{
+
+}
+
+void HeptaTemp::temp_sense(float* temp)
+{
+    //resistance
+    R1 = 2500;
+    R2 = 2500;
+    R3 = 110;
+    R4 = 1000;
+    R5 = 68000;
+    Pt = 100;
+    R_1 = 3;
+    R_2 = 2;
+
+//current
+    I = 0.001;
+
+//voltage
+    Vref = 2.5;
+
+//Gain&Offset
+    float gain = -R5*I/R4;
+    float off = Vref+I*R3;
+    //printf("%f\r\n",gain);
+    //printf("%f\r\n",off);
+//temperature coefficient
+    ce = 0.003851;
+
+    float volt = (_pin.read())*3.3*(R_1 + R_2)/R_1;
+    float Rth = (volt-off)/gain+R3;
+    *temp = (Rth-Pt)/(ce*Pt);
+   /* printf("%f\r\n",volt);
+    printf("%f\r\n",Rth);
+    printf("%f\r\n",*temp);*/
+    // delay some time before reading again
+    wait(0.5);
+
+}
+
+void HeptaTemp::temp_sense_u16(char* temp_u16, int *dsize)
+{
+    unsigned short temp_datas;
+    char temp1[8]= {0x00},temp2[8]= {0x00};
+    temp_datas=_pin.read_u16()>>4;
+    sprintf( temp1, "%02X", (temp_datas >> 8) & 0x0F);
+    sprintf( temp2, "%02X", (temp_datas) & 0xFF);
+    temp_u16[0]=temp1[0];
+    temp_u16[1]=temp1[1];
+    temp_u16[2]=temp2[0];
+    temp_u16[3]=temp2[1];
+    *dsize = 4;
+}
\ No newline at end of file