main.cpp

00001 #include "mbed.h"
00002 
00003 Serial pc(USBTX, USBRX);
00004 AnalogIn sensor(A2);
00005 
00006 int main() {
00007     float temperature1;
00008     float temperature2;
00009     pc.printf("\n\r");
00010     pc.printf("BD1020HFV Temperature sensor test program.\n\r");
00011     pc.printf("All values are approximates based on specification graph.\n\r");
00012     pc.printf("Formula values should be calibrated before use.\n\r");
00013     while(1) {
00014         //Input voltage 0-3.3V == 0.0-1.0f
00015         //-40'C == 1.87V
00016         //  0'C == 1.546V
00017         //192'C == 0V (out of scale)
00018         //1.87V / 232'C = 0.008060V/'C
00019         
00020         temperature1 = -(1000 * (sensor * 3.3f) - 1546) / 8.2;
00021         temperature2 = 192 - ( sensor * 3.3f / 0.008060 );
00022         pc.printf("Temperature, formula1=%5.3f, formula2=%5.3f\r\n", temperature1, temperature2);
00023         wait(1);
00024     }
00025 }