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main.cpp
00001 #include "mbed.h" 00002 #include "mtsas.h" 00003 00004 AnalogIn light(A0); 00005 AnalogIn temp(A1); 00006 DigitalOut led(D4); 00007 00008 bool lights_on() { 00009 float val = light.read(); 00010 if (val > 0.4f) 00011 return true; 00012 return false; 00013 } 00014 00015 float get_temp_c() { 00016 int beta = 3975; 00017 int val = temp.read_u16(); 00018 float res = (float) 10000.0 * ((65536.0 / val) - 1.0); 00019 float temp_c = (1 / ((log(res / 5000.0) / beta) + (1.0 / 298.15))) - 273.15 - 7; 00020 00021 return temp_c; 00022 } 00023 00024 float get_temp_f() { 00025 float temp_f = get_temp_c() * 9 / 5 + 32; 00026 00027 return temp_f; 00028 } 00029 00030 int main() { 00031 while (true) { 00032 printf("temp: %f C\t %f F\r\n", get_temp_c(), get_temp_f()); 00033 if (lights_on()) { 00034 printf("lights on!\r\n"); 00035 led = 0; 00036 } else { 00037 printf("lights off!\r\n"); 00038 led = 1; 00039 } 00040 wait(2); 00041 } 00042 00043 return 0; 00044 }
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