pw m charger

8/10/2019 Pw m Charger

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/*muhammad alfiyan nafis

subdiv.of power system engineering

div.of electrical engineering

engineering faculty

university of august 17th 1945*/

#include <LiquidCrystal.h>float solar_volt =0; // tegangan solar selfloat bat_volt=0; // tegangan bateraifloat sample1=0; // pembacaan pin A0float sample2=0; // [embacaan pin A1int pwm=6; // keluaran sinyal PWM pada gate mosfetint load=9; //load is connected to pin-9int charged_percent =0;LiquidCrystal lcd(12,11, 10, 5, 4, 3, 2);int backLight = 13; // pin 13 sebagai Kontrol backlightint RED=7; // indikator penggunaan bateraiint GREEN=8; // indikator pengisian dan penuhnya baterai

void setup(){ TCCR0B = TCCR0B & 0b11111000 | 0x05; // setting prescalar untuk frekuensi 61.03Hz pwm Serial.begin(9600); pinMode(pwm,OUTPUT); pinMode(load,OUTPUT); pinMode(RED,OUTPUT); pinMode(GREEN,OUTPUT); digitalWrite(pwm,LOW); digitalWrite(load,LOW); digitalWrite(RED,LOW);

digitalWrite(RED,LOW); pinMode(backLight, OUTPUT); //set pin 13 sebagai output analogWrite(backLight, 150); //kontrol intensitas backlight 0-255 lcd.begin(16,2); // kolom, baris, ukuran display lcd.clear(); // display kosong}void loop(){ lcd.setCursor(16,1); // set kursor lcd.print(" "); // tampilkan karakter kosong /////////////////////////// VOLTAGE SENSING /////////////////////////////////

///////////

for(int i=0;i<150;i++) { sample1+=analogRead(A0); //baca tegangan output solar panel sample2+=analogRead(A1); //baca tegangan baterai delay(2); } sample1=sample1/150;

sample2=sample2/150;// actual volt/divider output=3.127

//2.43 is eqv to 520 ADC



// 1 is eqv to .004673 solar_volt=(sample1*4.673* 3.127)/1000; bat_volt=(sample2*4.673* 3.127)/1000; Serial.print("solar input voltage :"); Serial.println(solar_volt); Serial.print("battery voltage :"); Serial.println(bat_volt); // ///////////////////////////PWM BASED CHARGING ////////////////////////////////////////////////// As battery is gradually charged the charge rate (pwm duty) is decreased// 14.4v = fully charged(100%)// 12v =fully discharged(0%)// when battery voltage is less than 12v, give you alart by glowing RED LED anddisplaying "DISCHARGED..."

if((solar_volt > bat_volt)&& ( bat_volt <= 12.96 )){analogWrite(pwm,242.25); // @ 95% duty // boost charging// most of the chargingdone hereSerial.print("pwm duty cycle is :");Serial.println("95%");}else if((solar_volt > bat_volt)&&(bat_volt > 12.96)&& (bat_volt <= 14.4 ))

{analogWrite(pwm,25.5); // 10% duty // float chargingSerial.print("pwm duty cycle is :");Serial.println("10%");}// // shut down when battery is fully charged or when sunlight is not enoughelse if ((bat_volt > 14.4) or (solar_volt < bat_volt)){analogWrite(pwm,0);Serial.print("pwm duty cycle is :");Serial.println("0%");digitalWrite(GREEN,LOW); // green LED will off as no charging is done during this time

}///////////////////////////////////////// BATTERY STATUS INDICATOR //////////////////////////////////////////////////The map() function uses integer math so will not generate fractions// so I multiply battery voltage with 10 to convert float into a intiger value// when battery voltage is 6.0volt it is totally discharged ( 12.96*6.94 =89.9424)// when battery voltage is 7.2volt it is fully charged (14.4*6.94=99.936)// 12.96v =0% and 14.4v =100%charged_percent=bat_volt*6.94;charged_percent=map(bat_volt*6.94, 89.9424 , 99.936 , 0 , 100);/* if (solar_volt > bat_volt)&&( bat_volt <=14.4))

{ Serial.print (charged_percent); Serial.println("% charged"); Serial.println(""); Serial.println("**********************************************************************************"); } else if (bat_volt < 12.96){



Serial.println("BATTERY IS DEAD !!!!! ");}*/////////////////////////////////////LCD DISPLAY ///////////////////////////////////////////////////// lcd.setCursor(0,0); // set the cursor at 1st col and 1st row lcd.print("SOL:"); lcd.print(solar_volt); lcd.print(" BAT:"); lcd.print(bat_volt); lcd.setCursor(1,1); // set the cursor at 1st col and 2nd row // LCD will show the %charged during charging period only if ((bat_volt > 12.96) && (bat_volt <=14.4)) { lcd.print(charged_percent); lcd.print("% Charged "); } // LCD will alart when battery is dead by displaying the message "BATTERY IS DEAD!!" else if (bat_volt < 12.96){ lcd.print("BATTERY IS DEAD!!");}/////////////////////////////LOAD ////LED INDICATION ///////////////////////////

////////////////////////////if ((solar_volt < 3 ) && (bat_volt > 6.2))// when there is no sunlight(night) and battery is charged,//load will switched on automatically{ digitalWrite(load,LOW); // for relay digitalWrite(load,HIGH);}///load will be disconnected during day time(solar_volt > 12) or when battery is discharged conditionif ((bat_volt < 12.96 )or (solar_volt > 12 )){ digitalWrite(load,HIGH); // for relay digitalWrite(load,LOW);

// prevent battery from complete discharging }//////////////////////////////LED INDICATION DURING CHARGING////////////////////////////////////////

if ( solar_volt > bat_volt && bat_volt <14.4){///Green LED will blink continiously indicating charging is going on digitalWrite(GREEN,HIGH); delay(5); digitalWrite(GREEN,LOW); delay(5);

}// Red LED will glow when battery is discharged// also display in LCDif (bat_volt < 12.96 && bat_volt > 12)// seecond restriction is given for indicating battery is dead// if you omit the (bat_volt > 12) when ever battery is dead also display bat discharged{ digitalWrite(RED,HIGH); // indicating battery is discharged lcd.setCursor(1,1);



lcd.print("BAT DISCHARGED.."); } // Red LED will OFF when battery is not dischargedif (bat_volt > 12.96){ digitalWrite(RED,LOW);}//Green LED will glow when battery is fully chargedif(bat_volt >=14.4){digitalWrite(GREEN,HIGH);}

}

pw m charger

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