main.cpp

00001 #include "mbed.h"
00002 
00003 DigitalOut relay1(p24);
00004 DigitalOut chargeLED(p30);
00005 DigitalOut dumpLED(p29);
00006 AnalogIn load1 (p16);
00007 
00008 
00009 #define rRatio  6.6355
00010 #define EMPTY  12.2000
00011 #define UPPER_CHARGE_LIMIT  13.0
00012 
00013 int justConnected = 0;
00014 
00015 void flash(void) {
00016 for (int i=0;i<5;i++)  { 
00017         dumpLED = 1;
00018         chargeLED = 1;
00019         wait(0.5);
00020         dumpLED = 0;
00021         chargeLED = 0;    
00022         wait(0.5);
00023   }
00024  
00025 }
00026 
00027 //chargeLED = RED
00028 //dumpLED = Green
00029 
00030  void chargeOne() {
00031  
00032   justConnected = 0;
00033 
00034   //with latch
00035    relay1=1;    
00036    chargeLED=1;
00037    dumpLED = 0;
00038    
00039    while (1) {
00040     
00041      float voltage1 = load1*rRatio*3.3000;
00042    
00043      float delay = 0.2;  
00044      if (UPPER_CHARGE_LIMIT > voltage1) {
00045         delay=0.2+(UPPER_CHARGE_LIMIT - voltage1);
00046      }
00047      
00048      wait (delay);
00049      chargeLED=1;
00050      wait (0.25);
00051      chargeLED=0;
00052 
00053      // When the battery is charged to the limit, switch the relay off and return
00054      voltage1 = load1*rRatio*3.3000;
00055      if (voltage1 >= UPPER_CHARGE_LIMIT ) {
00056         flash();
00057         relay1=0;    
00058         chargeLED=0;
00059         return;
00060      }   
00061     
00062    } //loop
00063 
00064 }
00065 
00066 void init(void) {
00067  for (int i=0;i<10;i++)  { 
00068         dumpLED = 1;
00069         wait(0.5);
00070         dumpLED = 0;
00071         chargeLED = 1;
00072         wait(0.5);
00073         chargeLED = 0;     
00074   }
00075  for (int i=0;i<1;i++)  { 
00076         dumpLED = 1;
00077         chargeLED = 1;
00078         wait(0.5);
00079         dumpLED = 0;
00080         chargeLED = 0;    
00081         wait(0.5);
00082   }
00083   
00084   justConnected = 1;
00085  
00086 }
00087 
00088 
00089 void dump() {
00090 
00091  dumpLED = 1;
00092  wait(0.5);
00093  dumpLED = 0;
00094  
00095 }
00096 
00097 int main() {
00098     init();
00099     while(1) {
00100      wait(1);
00101      float voltage1 = load1*rRatio*3.3000;
00102      if ((voltage1 <= EMPTY) || ((justConnected == 1) && (voltage1 < UPPER_CHARGE_LIMIT))) {
00103         chargeOne();
00104      } else {
00105         dump();
00106      }    
00107 
00108     } 
00109 }