main.cpp

00001 #include "mbed.h"
00002 #include "TextLCD.h"
00003 
00004 // mbed -> EZ1
00005 // -----------
00006 // VOUT -> +5
00007 // GND  -> GND
00008 // p20  -> AN
00009 
00010 
00011 TextLCD lcd(p24, p26, p27, p28, p29, p30); // rs, e, d4-d7
00012 AnalogIn ain(p15);
00013 
00014 LocalFileSystem local("local");               // Create the local filesystem under the name "local"
00015 
00016 int main() {
00017     float adc, volts, grams;
00018     DigitalIn writebutton(p17);
00019     DigitalIn closebutton(p18);
00020 
00021     FILE *fp = fopen("/local/out.txt", "w");  // Open "out.txt" on the local file system for writing
00022     
00023     int writeenable = 0;
00024     int closefile = 0;
00025     
00026     writebutton.mode(PullUp);
00027     closebutton.mode(PullUp);
00028     
00029     while (1){
00030         writeenable = writebutton.read();
00031         closefile = closebutton.read();
00032         
00033         lcd.locate(0,0);
00034         adc = ain.read();           // read analog as a float
00035         volts = adc * 3.3;          // convert to volts
00036 
00037         lcd.printf("%8.3f volts\n", volts);
00038         
00039         if(closefile == 0){
00040             fclose(fp);
00041             break;  
00042         }
00043         
00044         if(writeenable == 0){
00045             lcd.cls();
00046             lcd.printf("Recording Voltage...\n\n");
00047             fprintf(fp, "%8.3f volts\n", volts);
00048             lcd.printf("Done!\n\n");
00049             wait(0.5);
00050             lcd.cls();
00051         }
00052         
00053         wait(0.05);                 // 20Hz update rate (once per 0.05 seconds)
00054     }
00055 }
00056 
00057