Diff: main.cpp

Revision:

0:ac0f9392c781

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Jan 10 18:20:02 2017 +0000
@@ -0,0 +1,273 @@
+//project: Real_time embedded system
+#include "mbed.h"
+#include "C12832.h"
+#include "LM75B.h"
+#include "MMA7660.h"
+
+// Using Arduino pin notation
+C12832 lcd(D11, D13, D12, D7, D10);
+
+//Temperature measurement sensor set up
+LM75B tem(D14,D15);
+
+//joystick
+DigitalIn up(A2);
+DigitalIn down(A3);
+DigitalIn left(A4);
+DigitalIn right(A5);
+DigitalIn center(D4);
+
+//two Potentiometers
+AnalogIn pot1 (A0);
+AnalogIn pot2 (A1);
+
+//3 Axis Accelerometer
+MMA7660 MMA(D14,D15);
+
+//led on shiled
+PwmOut r (D5);
+PwmOut b (D8);
+PwmOut g (D9);
+
+//temperature value store in x1,2,3,4
+float a=0; //temperature store in a
+float x1=0,x2=0,x3=0,x4=0;
+
+//y axis point of each point need to plot on lcd
+int y1=20,y2=20,y3=20,y4=20;
+
+void counter (void);
+void findy (void);
+float d=0;//distance between each y-axis point on plot
+float dyarray[18];
+float x1array[18],x2array[18],x3array[18],x4array[18];
+float x1min=0,x2min=0,x3min=0,x4min=0;
+
+//find max and min for y axis
+void findmax(void);
+void findmin(void);
+float xarray[]= {x1,x2,x3,x4};
+float max=0;//max number of x1,2,3,4
+float min=0;//min number of x1,2,3,4
+//plot funciton
+void plot(void);
+
+//menu
+int menu =0;//this integer to wtich menu
+void joystick (void);//use joystick to change menu
+
+//Highest tem and lowest tem
+void temdata(void);
+int nod=0;//number of data
+int highlow=0;
+float hightem=0,lowtem=0;
+
+//timer
+Timer t;
+int main()
+{
+    r=1;
+    b=1;
+    g=1;
+    lcd.cls();//clear screen
+    t.start();//start timer
+    while(1) {
+        joystick();//detect any movement at joystick
+        temdata();//collecting temperature data
+        switch (menu) {//using swtich menu to show different case on screen
+            case 0://title 1
+                lcd.cls();
+                lcd.locate(0,0);
+                lcd.printf("Real Time Embeded System");
+                lcd.locate(0,18);
+                lcd.printf("Scroll with Joystick");
+                wait(1);
+                break;
+            case 1://title 2
+                lcd.cls();
+                lcd.locate(0,0);
+                lcd.printf("Project: Temprature Plot");
+                lcd.locate(0,18);
+                lcd.printf("Student No.170411");
+                wait(1);
+                break;
+            case 2:// showing temperature and plot for latest four result
+                lcd.cls();
+                lcd.locate(0,0);
+                lcd.printf("Tem:");
+                //print temperature
+                lcd.locate(21,0);
+                lcd.printf("%.1f\n",x1);
+
+                lcd.locate(46,0);
+                lcd.printf("%.1f\n",x2);
+
+                lcd.locate(71,0);
+                lcd.printf("%.1f\n",x3);
+
+                lcd.locate(96,0);
+                lcd.printf("%.1f\n",x4);
+                plot();//plot diagram
+                counter();//shift data from right to left and store latest data at x4
+                wait(1);
+                break;
+            case 3://show how much time taken and how many data collect from temperature sensor
+                lcd.cls();
+                lcd.locate(0,0);
+                lcd.printf("Time taken: %.2f s",t.read());
+                lcd.locate(0,17);
+                lcd.printf("Number of data collect: %i",nod);
+                wait(1);
+                break;
+            case 4:// show highest temperature
+                lcd.cls();
+                lcd.locate(0,0);
+                lcd.printf("Hightest temprature so far: ");
+                lcd.locate(0,18);
+                lcd.printf("Tem: %.2f",hightem);
+                wait(1);
+                break;
+            case 5:// show lowest temperature
+                lcd.cls();
+                lcd.locate(0,0);
+                lcd.printf("Lowest temprature so far: ");
+                lcd.locate(0,18);
+                lcd.printf("Tem: %.2f",lowtem);
+                wait(1);
+                break;
+        }//switch
+    }//while
+}//main
+void joystick()//detect two button at joystick (up and down)
+{
+    //change "menu" to change menu at switch
+    if (down==1) {
+        menu=menu+1;
+    }
+    if (up==1) {
+        menu=menu-1;
+    }
+    //use those if statement to create a close loop between menu=0 to menu=5
+    if (menu>5) {
+        menu=0;
+    }
+    if (menu<0) {
+        menu=5;
+    }
+
+}
+void temdata()
+{
+    a=tem.temp();//get current temperature and store to a
+    nod=nod+1;//counter (nod) count how many data collect from sensor
+    if (highlow==0) {//when collect first data, store first temperature value to hightem and lowtem
+        hightem=a;
+        lowtem=a;
+        highlow=1;//set highlow to 1, so this function will only run once
+    }
+    if (hightem<=a) {//store highest temprature value into hightem
+        hightem=a;
+    }
+    if (lowtem>=a) {//store lowest temprature value into lowtem
+        lowtem=a;
+    }
+}
+void counter()//shift data from right to left
+{
+    x1=x2;
+    x2=x3;
+    x3=x4;
+    x4=a;
+}
+void plot()
+{
+    //plot diagram
+    findy();//find y value at y axis of each data (x1,2,3,4)
+    lcd.line(100,y4,76,y3,1);
+    lcd.line(76,y3,50,y2,1);
+    lcd.line(50,y2,27,y1,1);
+}
+void findy()
+{
+    findmax();//find maximum value from x1,2,3,4
+    findmin();//find minimum value from x1,2,3,4
+    d=(max-min)/18;//caculate different between each point at y-axis
+    //y-axis point writen in yarray
+    int yarray[] = {30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12};
+    int i;
+    for (i=0; i<18; i=i+1) {//using for loop to find y value for each x
+        dyarray[i]=min+i*d;//this array store temperature map according to four x temperature and 18 y axis
+        //x1
+        x1array[i]=x1-dyarray[i];//find different between x1 and dyarray
+        if (x1array[i]<0) {//store absolute vaue of x1array 
+            x1array[i]=-x1array[i];
+        }
+        if (i==0) {//store first x1array to x1min
+            x1min=x1array[i];
+        }
+        if (x1array[i]<=x1min) {//find minimum value of x1array, 
+            y1=yarray[i];//store corresponding y into y1
+            x1min=x1array[i];
+        }
+        //x2
+        x2array[i]=x2-dyarray[i];
+        if (x2array[i]<0) {
+            x2array[i]=-x2array[i];
+        }
+        if (i==0) {
+            x2min=x2array[i];
+        }
+        if (x2array[i]<=x2min) {
+            y2=yarray[i];
+            x2min=x2array[i];
+        }
+        //x3
+        x3array[i]=x3-dyarray[i];
+        if (x3array[i]<0) {
+            x3array[i]=-x3array[i];
+        }
+        if (i==0) {
+            x3min=x3array[i];
+        }
+        if (x3array[i]<=x3min) {
+            y3=yarray[i];
+            x3min=x3array[i];
+        }
+        //x4
+        x4array[i]=x4-dyarray[i];
+        if (x4array[i]<0) {
+            x4array[i]=-x4array[i];
+        }
+        if (i==0) {
+            x4min=x4array[i];
+        }
+        if (x4array[i]<=x4min) {
+            y4=yarray[i];
+            x4min=x4array[i];
+        }
+    }
+}
+
+void findmax()
+{
+    max=x1;
+    int i;
+    float xarray[]= {x1,x2,x3,x4};
+    for(i=0; i<4; i=i+1) {
+        if (xarray[i]>max) {
+            max=xarray[i];
+        }
+    }
+}
+
+void findmin()
+{
+    min=x1;
+    int i;
+    float xarray[]= {x1,x2,x3,x4};
+    for(i=0; i<4; i=i+1) {
+        if (xarray[i]<min) {
+            min=xarray[i];
+        }
+    }
+}
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