How To Make Battery Capacity Tester

26 Jul

How To Make Battery Capacity Tester

https://youtu.be/RzmDP-NX-F8

Nowadays fake Lithium and NiMH batteries are everywhere which is sold by advertising with higher capacities than their true capacity. So it is really difficult to distinguish between a real and a fake battery. Similarly, it is difficult to know the capacity retained in the salvaged 18650 laptop batteries. So, a device is required to measure the true capacity of the batteries.

Diagram:

Code:


#include<JC_Button.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


const float Low_BAT_level = 3.0;
//Current steps with a 3R load (R7)
const int Current [] = {0,100,200,300,400,500,600,700,800,900,1000};
const byte PWM_Pin = 10;
const byte Buzzer = 9;
const int BAT_Pin = A1;
int PWM_Value = 0;
unsigned long Capacity = 0;
int ADC_Value = 0;
float Vcc = 4.28; // Voltage of Arduino 5V pin ( Mesured by Multimeter )
float BAT_Voltage = 0;
float sample =0;
byte Hour = 0, Minute = 0, Second = 0;
bool calc = false, Done = false;
Button UP_Button(2, 25, false, true);
Button Down_Button(3, 25, false, true);


void setup () {
//
Serial.begin(9600);
pinMode(PWM_Pin, OUTPUT);
pinMode(Buzzer, OUTPUT);
analogWrite(PWM_Pin, PWM_Value);
UP_Button.begin();
Down_Button.begin();
display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
display.clearDisplay();
display.setTextColor(WHITE); 
display.setTextSize(2);
display.setCursor(12,25);
display.print("EASY TECH");
display.display();  
delay(2000);
display.clearDisplay();
display.setTextSize(2);
display.setCursor(2,15);
display.print("Adj Curr:"); 
display.setCursor(2,40);
display.print("UP/Down:");
display.print("0");
display.display();  
}

//************************* End of Setup function *******************************

void loop() {
  UP_Button.read();
  Down_Button.read();
if (UP_Button.wasReleased() && PWM_Value < 256 && calc == false)
 {
  PWM_Value = PWM_Value + 25; 
  if(PWM_Value > 256){
    PWM_Value=PWM_Value-25;
  }
  analogWrite(PWM_Pin,PWM_Value);
  display.clearDisplay();
  display.setCursor(2,25);
  display.print("Curr:");   
  display.print(String(Current[PWM_Value / 25])+"mA");
  display.display();  
  Serial.println(String(Current[PWM_Value / 25]));
  Serial.print(PWM_Value);
 }
if (Down_Button.wasReleased() && PWM_Value > 1 && calc == false)
{ 
  PWM_Value = PWM_Value - 25; 
  analogWrite(PWM_Pin,PWM_Value); 
  display.clearDisplay();
  display.setCursor(2,25);
  display.print("Curr:");   
  display.print(String(Current[PWM_Value / 25])+"mA");
  display.display();  
  Serial.println(String(Current[PWM_Value / 25]) + "mA");
  
} 

if (UP_Button.pressedFor (1000) && calc == false)
{
  digitalWrite(Buzzer, HIGH);
  delay(100);
  digitalWrite(Buzzer, LOW);
  display.clearDisplay();
  timerInterrupt(); 
   
  }
}

//************************* End of Loop function *******************************

void timerInterrupt(){
  calc = true;
  while (Done == false)  {
     Second ++;
    if (Second == 60)  {
      Second = 0;
      Minute ++;      
    }
    if (Minute == 60)  {
      Minute = 0;
      Hour ++;
    }

 //************ Measuring Battery Voltage ***********
  
  for(int i=0;i< 100;i++)
  {
   sample=sample+analogRead(BAT_Pin); //read the Battery voltage 
   delay (2);
  }
  sample=sample/100; 
  BAT_Voltage = sample * Vcc/ 1024.0; 
 
  //*********************************************

    display.clearDisplay();
    display.setTextSize(2);
    display.setCursor(20,5);
    display.print(String(Hour) + ":" + String(Minute) + ":" + String(Second));

    display.setTextSize(1);
    display.setCursor(0,25);
    display.print("Disch Curr: ");   
    display.print(String(Current[PWM_Value / 25])+"mA");
     
    
    display.setCursor(2,40);   
    display.print("Bat Volt:" + String(BAT_Voltage)+"V" );



    Capacity =  (Hour * 3600) + (Minute * 60) + Second;
    Capacity = (Capacity * Current[PWM_Value / 25]) / 3600;
    display.setCursor(2, 55);
    display.print("Capacity:" + String(Capacity) + "mAh");
    display.display();

    
    if (BAT_Voltage < Low_BAT_level)
    {
      Capacity =  (Hour * 3600) + (Minute * 60) + Second;
      Capacity = (Capacity * Current[PWM_Value / 25]) / 3600;
      display.clearDisplay(); 
      display.setTextSize(2);      
      display.setCursor(2,15);     
      display.print("Capacity:");
      display.setCursor(2,40);  
      display.print(String(Capacity) + "mAh");
      display.display();
      Done = true;
      PWM_Value = 0;
      analogWrite(PWM_Pin, PWM_Value);
      digitalWrite(Buzzer, HIGH);
      delay(100);
      digitalWrite(Buzzer, LOW);
      delay(100);
      digitalWrite(Buzzer, HIGH);
      delay(100);
      digitalWrite(Buzzer, LOW);
      delay(100);
    }
       delay(1000);
  } 
   
}

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#include<JC_Button.h>

#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels

#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)

#define OLED_RESET 4 // Reset pin # (or -1 if sharing Arduino reset pin)

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const float Low_BAT_level = 3.0;

//Current steps with a 3R load (R7)

const int Current [] = {0,100,200,300,400,500,600,700,800,900,1000};

const byte PWM_Pin = 10;

const byte Buzzer = 9;

const int BAT_Pin = A1;

int PWM_Value = 0;

unsigned long Capacity = 0;

int ADC_Value = 0;

float Vcc = 4.28; // Voltage of Arduino 5V pin ( Mesured by Multimeter )

float BAT_Voltage = 0;

float sample =0;

byte Hour = 0, Minute = 0, Second = 0;

bool calc = false, Done = false;

Button UP_Button(2, 25, false, true);

Button Down_Button(3, 25, false, true);

void setup () {

Serial.begin(9600);

pinMode(PWM_Pin, OUTPUT);

pinMode(Buzzer, OUTPUT);

analogWrite(PWM_Pin, PWM_Value);

UP_Button.begin();

Down_Button.begin();

display.begin(SSD1306_SWITCHCAPVCC, 0x3C);

display.clearDisplay();

display.setTextColor(WHITE);

display.setTextSize(2);

display.setCursor(12,25);

display.print("EASY TECH");

display.display();

delay(2000);

display.clearDisplay();

display.setTextSize(2);

display.setCursor(2,15);

display.print("Adj Curr:");

display.setCursor(2,40);

display.print("UP/Down:");

display.print("0");

display.display();

}

//************************* End of Setup function *******************************

void loop() {

UP_Button.read();

Down_Button.read();

if (UP_Button.wasReleased() && PWM_Value < 256 && calc == false)

{

PWM_Value = PWM_Value + 25;

if(PWM_Value > 256){

PWM_Value=PWM_Value-25;

}

analogWrite(PWM_Pin,PWM_Value);

display.clearDisplay();

display.setCursor(2,25);

display.print("Curr:");

display.print(String(Current[PWM_Value / 25])+"mA");

display.display();

Serial.println(String(Current[PWM_Value / 25]));

Serial.print(PWM_Value);

}

if (Down_Button.wasReleased() && PWM_Value > 1 && calc == false)

{

PWM_Value = PWM_Value - 25;

analogWrite(PWM_Pin,PWM_Value);

display.clearDisplay();

display.setCursor(2,25);

display.print("Curr:");

display.print(String(Current[PWM_Value / 25])+"mA");

display.display();

Serial.println(String(Current[PWM_Value / 25]) + "mA");

}

if (UP_Button.pressedFor (1000) && calc == false)

{

digitalWrite(Buzzer, HIGH);

delay(100);

digitalWrite(Buzzer, LOW);

display.clearDisplay();

timerInterrupt();

}

//************************* End of Loop function *******************************

void timerInterrupt(){

calc = true;

while (Done == false) {

Second ++;

if (Second == 60) {

Second = 0;

Minute ++;

}

if (Minute == 60) {

Minute = 0;

Hour ++;

}

//************ Measuring Battery Voltage ***********

for(int i=0;i< 100;i++)

{

sample=sample+analogRead(BAT_Pin); //read the Battery voltage

delay (2);

}

sample=sample/100;

BAT_Voltage = sample * Vcc/ 1024.0;

//*********************************************

display.clearDisplay();

display.setTextSize(2);

display.setCursor(20,5);

display.print(String(Hour) + ":" + String(Minute) + ":" + String(Second));

display.setTextSize(1);

display.setCursor(0,25);

display.print("Disch Curr: ");

display.print(String(Current[PWM_Value / 25])+"mA");

display.setCursor(2,40);

display.print("Bat Volt:" + String(BAT_Voltage)+"V" );

Capacity = (Hour * 3600) + (Minute * 60) + Second;

Capacity = (Capacity * Current[PWM_Value / 25]) / 3600;

display.setCursor(2, 55);

display.print("Capacity:" + String(Capacity) + "mAh");

display.display();

if (BAT_Voltage < Low_BAT_level)

{

Capacity = (Hour * 3600) + (Minute * 60) + Second;

Capacity = (Capacity * Current[PWM_Value / 25]) / 3600;

display.clearDisplay();

display.setTextSize(2);

display.setCursor(2,15);

display.print("Capacity:");

display.setCursor(2,40);

display.print(String(Capacity) + "mAh");

display.display();

Done = true;

PWM_Value = 0;

analogWrite(PWM_Pin, PWM_Value);

digitalWrite(Buzzer, HIGH);

delay(100);

digitalWrite(Buzzer, LOW);

delay(100);

digitalWrite(Buzzer, HIGH);

delay(100);

digitalWrite(Buzzer, LOW);

delay(100);

}

delay(1000);

}

How To Make Battery Capacity Tester

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How To Make Battery Capacity Tester

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