Code:

// still testing
#define RECHARGECYCLES 30
#define RECHARGEREMOVECYCLES 4
#define RECHARGEPAUSE 100000
#define RECHARGEMAX 10 // 10 cycles a 30 seconds 5mins = 300 seconds without change in batterie voltage

// recharge batteries functions
// thanks to kess and pieddemamouth (robosavvy-forums)
unsigned int readADC(byte channel)
{
    ADMUX  = 0x40 | channel;
    ADCSRA = 0xC6;
    while(bit_is_set(ADCSRA, ADSC));
    return (ADCL | (ADCH<<8));
}

void rechargeBatteries(unsigned int maxCycles)
{
   // configuration
   cli();
   
   PORTE |= _BV(PE4);    //enable pull-up resistor 4
    EIMSK |= _BV(INT4);   //enable interrupt 4
    DDRC = 0xFF;
    PORTC = 0xFF;
    DDRB |= _BV(DDB5);  //output for bit PB5

    //ADC configuration
    ADMUX = 0x10;
    ADCSRA = 0x80;
   
    sei();
   
   unsigned int voltage[RECHARGECYCLES], voltageCounter, counter, average, oldAverage;
   byte buffer[8];
   int i,j;
   
   // enable charging
   PORTB &= ~PB5;
   
   counter = 0;
   voltageCounter = 0;
   average = 0;
   oldAverage = 10000;
   
   while (true)
   {
       voltage[voltageCounter] = readADC(1);
      voltage[voltageCounter] *= 2;
      voltageCounter++;
      
      if (voltageCounter >= RECHARGECYCLES)
      {
         voltageCounter = 0;
         
         // min sort
         unsigned int min;
         int minId;
         for (i=0; i<RECHARGECYCLES; i++)
         {
            min = voltage[i];
            minId = i;
            for (j=i+1; j<RECHARGECYCLES; j++)
               if (voltage[j] < min)
               {
                  minId = j;
                  min = voltage[j];
               }
               
            min = voltage[i];
            voltage[i] = voltage[minId];
            voltage[minId] = min;
         }
         
         // calc average (without REMOVECYCLES largest and smallest values)
         unsigned long int tmp = voltage[RECHARGECYCLES];
         for (i=RECHARGEREMOVECYCLES+1; i<RECHARGECYCLES-RECHARGEREMOVECYCLES; i++)
         {
               tmp += voltage[i];
         }
         
         double tmpf = (double) tmp / ((double)(RECHARGECYCLES-2*RECHARGEREMOVECYCLES));
         
         average = (unsigned int) (tmpf + 0.5);
         
         if (average >= oldAverage) // unchanged
            counter++;
         else
         {
            counter = 0; // reset counter if changed
            oldAverage = average;
         }
      }
      
      if (counter >= maxCycles)
      {
         buffer[0] = 0xFF;
         buffer[1] = 0xFF;
         buffer[2] = 0xFF;
         buffer[3] = 0xFF;
         buffer[4] = 0xFF;
         buffer[5] = 0xFF;
         buffer[6] = 0xFF;
         buffer[7] = 0xFF;
         writeData(buffer, 8);
         break;
      }   
         
      buffer[0] = voltage[(voltageCounter - 1) % RECHARGECYCLES]  & 0xFF;
      buffer[1] = (voltage[(voltageCounter - 1) % RECHARGECYCLES] ) >> 8;
      buffer[2] = average & 0xFF;
      buffer[3] = (average) >> 8;
      buffer[4] = counter & 0xFF;
      buffer[5] = (counter & 0xFF00) >> 8;
      buffer[6] = maxCycles & 0xFF;
      buffer[7] = (maxCycles & 0xFF00) >> 8;
      writeData(buffer, 8);
      
      sleep(RECHARGEPAUSE); //1000ms
   }
   
   // disable charging
   PORTB |= PB5;
}

Statistics: Posted by cosa — Wed Apr 23, 2008 10:41 pm

Statistics: Posted by Kess — Sat Apr 05, 2008 10:46 pm

Statistics: Posted by bergere — Fri Apr 04, 2008 10:38 am

Statistics: Posted by Kess — Mon Mar 17, 2008 8:45 pm

Code:

PORTB &= ~PB5;


Code:

int main(void) {
    CM5_init();
    unsigned int i=1, retour,condition=0;

    PORTE |= _BV(PE4);    //enable pull-up resistor 4
    EIMSK |= _BV(INT4);   //enable interrupt 4
    DDRC = 0xFF;
    PORTC = 0xFF;
    DDRB |= _BV(DDB5);  //output for bit PB5

    //ADC configuration
    ADMUX = 0x10;
    ADCSRA = 0x80;

    while(1)
    {
            CM5_RS232_writeString("\rTension batterie : ");
            retour = ReadADC(16);
            retour = retour*2;
            CM5_RS232_writeHexInt(retour);
            CM5_RS232_writeString("\n\r");
    }
}


Statistics: Posted by pieddemamouth — Mon Mar 17, 2008 6:33 pm

Code:

if(!(DDRB &(1<<5))) DDRB |=(1<<5);


Statistics: Posted by bergere — Mon Mar 17, 2008 9:53 am

Statistics: Posted by pieddemamouth — Wed Mar 12, 2008 7:54 pm

Statistics: Posted by bergere — Wed Mar 12, 2008 4:11 pm

Statistics: Posted by pieddemamouth — Mon Feb 18, 2008 10:44 pm

- Why did you have selected the "ADC Prescaler". To my mind it's useless, we want the ADC result asap.

By default, the successive approximation circuitry requires an input clock frequency between 50kHz and 200kHz to get maximum resolution. If a lower resolution than 10 bits is needed, the input clock frequency to the ADC can be higher than 200kHz to get a higher sample rate.

Statistics: Posted by Kess — Mon Feb 18, 2008 9:40 pm

One other thing you guys may need to know is that the processor's AREF pin (pin 62), which provides the reference voltage for the ADC, is connected directly to the +5V rail.

Statistics: Posted by pieddemamouth — Sun Feb 17, 2008 3:49 pm

Statistics: Posted by siempre.aprendiendo — Thu Feb 14, 2008 2:12 pm

Statistics: Posted by pieddemamouth — Thu Feb 14, 2008 7:44 am

Code:

unsigned ReadADC(byte channel)
{
    ADMUX  = 0x40 | channel;
    ADCSRA = 0xC6;
    while(bit_is_set(ADCSRA, ADSC));
    return (ADCL | (ADCH<<8));
}


Statistics: Posted by Kess — Wed Feb 13, 2008 11:18 pm

Statistics: Posted by Kess — Wed Feb 13, 2008 10:21 pm