Revision 6:710e18c552f5, committed 2014-09-14

Comitter:

scohennm

Date:

Sun Sep 14 23:45:39 2014 +0000

Parent:

5:817aa144563d

Child:

7:8d7089b514ae

Commit message:

Example of using visible light sensor and LCD display. LEDs showing high and low limits.

Changed in this revision

--- a/main.cpp	Fri Sep 12 19:46:15 2014 +0000
+++ b/main.cpp	Sun Sep 14 23:45:39 2014 +0000
@@ -2,9 +2,10 @@
 #include "SLCD.h"
 
 
-// An example of C++ abuse 140904 sc
+// An State Machine solution to HW 4.1 Q3
+// using wait() for high and low limits.
 //#define PRINTDEBUG
-#define PROGNAME "blink_kl46z_states v1\n\r"
+#define PROGNAME "blink_kl46z_states v2\n\r"
 #define LEDON false
 #define LEDOFF true
 #define LEDTMESS "TRUE"
@@ -14,8 +15,12 @@
 #define PWMTIME 1 // ms (kHz
 #define LCDLEN 10
 #define NUMSTATES 2
-#define NEWBLINK 1
-#define IDLESTATE 0
+#define LOWLIMIT 0.1
+#define HILIMIT 0.85
+#define ONTIME 1.0
+
+
+enum blinkStates {IDLESTATE, NEWBLINK, LOWLITE, HILITE}; // define the states
 
 char logicalString [NUMSTATES][LCDLEN] = {LEDFMESS, LEDTMESS};
 SLCD slcd; //define LCD display globally define
@@ -30,9 +35,11 @@
 int main() {
     DigitalOut greenColor(LED_GREEN);
     DigitalOut redColor(LED_RED);
+    AnalogIn LightSensor(PTE22);
+    float lightData; 
     char lcdData[LCDLEN];
     Timer LEDTimer;  // time till next PWM values is to change.
-    int PGMState = IDLESTATE; // work till timer transitions
+    blinkStates PGMState = IDLESTATE; // work till timer transitions
     int ledState = LEDON;  
     
    
@@ -48,16 +55,44 @@
         switch (PGMState){ 
             case IDLESTATE: {
                 if (LEDTimer.read_ms() > timeToChangeDF){ // check for timer time out transtion
-                    PGMState = NEWBLINK;
-                    }
+                    lightData = (1.0 - LightSensor.read());
+                    sprintf(lcdData,"%4.3f",lightData);
+                    LCDMess(lcdData);  
+                    if (lightData < LOWLIMIT){ // find appropriate state
+                        PGMState = LOWLITE;
+                    } else if (lightData > HILIMIT){
+                        PGMState = HILITE;
+                    } else {
+                        PGMState = NEWBLINK;
+                    }                      
+                    
+                }
                 break;
               }
              case  NEWBLINK: {              
                 ledState = !ledState;
-                redColor = ledState;
-                greenColor = !ledState;
-                sprintf(lcdData,logicalString[ledState]);
-                LCDMess(lcdData);               
+                redColor.write(ledState);
+                greenColor.write(!ledState);
+                // create string for display on LCD
+                             
+                LEDTimer.reset();  // reset the timer
+                PGMState = IDLESTATE;  // go idle state
+                break;
+              }
+             case HILITE: {              
+                redColor.write(LEDON);
+                greenColor.write(LEDOFF);
+                // create string for display on LCD
+                wait(ONTIME);       
+                LEDTimer.reset();  // reset the timer
+                PGMState = IDLESTATE;  // go idle state
+                break;
+              }
+             case LOWLITE: {              
+                redColor.write(LEDOFF);
+                greenColor.write(LEDON);
+                // create string for display on LCD
+                wait(ONTIME);       
                 LEDTimer.reset();  // reset the timer
                 PGMState = IDLESTATE;  // go idle state
                 break;