main.cpp

00001 #include "mbed.h"
00002 
00003 //Constants
00004 #define N 10
00005 
00006 //Global objects
00007 Serial pc(USBTX, USBRX);
00008 
00009 BusOut binaryOutput(D5, D6, D7);
00010 AnalogIn POT_ADC_In(A0);
00011 AnalogIn LDR_ADC_In(A1);
00012 
00013 float xPOT[N]; //Aray of potentiometer samples
00014 float xLDR[N]; //Aray of LDR samples
00015 
00016 //Main function
00017 int main()
00018 {
00019 
00020     //Set baud rate to 115200
00021     pc.baud(115200);
00022 
00023     //Print header
00024     pc.printf("POT,LDR,avPOT, acLDR\n\n");
00025 
00026     while(1) {
00027 
00028         //Move the samples in both arrays to the right
00029         for (unsigned int n=(N-1); n>0; n--) {
00030             xPOT[n] = xPOT[n-1];
00031             xLDR[n] = xLDR[n-1];
00032         }
00033 
00034         //Insert the new sample at position 0
00035         xPOT[0] = POT_ADC_In;
00036         xLDR[0] = LDR_ADC_In;
00037 
00038         //Calculate average for POT
00039         float fSum = 0.0;
00040         for (unsigned int n=0; n<N; n++) {
00041             fSum += xPOT[n];
00042         }
00043         float fPOTAverage = fSum / (float)N;
00044 
00045         //Calculate average for LDR
00046         fSum = 0.0;
00047         for (unsigned int n=0; n<N; n++) {
00048             fSum += xLDR[n];
00049         }
00050         float fLDRAverage = fSum / (float)N;
00051 
00052         //Write to terminal via Serial interface
00053         pc.printf("%6.4f,%6.4f,%6.4f,%6.4f\n", xPOT[N/2], xLDR[N/2], fPOTAverage, fLDRAverage);
00054 
00055         //Check the threshold
00056         if (fLDRAverage > fPOTAverage) {
00057             binaryOutput = 0;   //Binary 000
00058         } else {
00059             binaryOutput = 7;   //Binary 111
00060         }
00061 
00062         //Wait 1/100th second
00063         wait(0.01);
00064 
00065 
00066     } //end while(1)
00067 } //end main