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main.cpp
00001 #include "mbed.h" 00002 #include "TextLCD.h" 00003 00004 Serial serialpc( USBTX,USBRX); 00005 TextLCD lcd(D0,D1,D2,D3,D4,D5); 00006 00007 00008 00009 InterruptIn Echo(D8); 00010 DigitalOut Trigg(D9); 00011 Timer timer; 00012 float dist=0; 00013 DigitalOut led(LED2); 00014 void start(){ 00015 timer.reset(); 00016 timer.start(); 00017 } 00018 00019 void stop(){ 00020 timer.stop(); 00021 dist=timer.read_us(); 00022 } 00023 00024 int main(){ 00025 Echo.rise(&start); 00026 Echo.fall(&stop); 00027 Trigg=0; 00028 00029 while(1){ 00030 dist=0; 00031 Trigg=1; 00032 wait_us(10); 00033 Trigg=0; 00034 while(dist==0){ 00035 wait_us(1); 00036 00037 } 00038 00039 dist=dist/58.0; 00040 if(dist>5){ 00041 led=1; 00042 }else{ 00043 led=0; 00044 } 00045 lcd.locate(0,0); 00046 lcd.printf("la distancia es"); 00047 lcd.locate(0,1); 00048 lcd.printf("%f cm",dist); 00049 wait(.3); 00050 00051 00052 00053 00054 } 00055 }
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