In this modern and hi-tech
world, we need lots of variety of power storage solutions and one of the most
popular solution is battery (We all already know this) and also most popular
battery is Li-Ion and Li-Po now days. For Modern world we need a battery which
can provide high amps or current for long time and small in size which only
possible with Li-ion Battery not Lead-Acid, Ni-Cd Battery nor Ni-MH Battery
etc. But there are lots of cheap and non-branded Chinese Li-Ion Batteries
available in the markets which promises more capacity but not actually yet. So
in this post, I am goanna make one Arduino based Battery Capacity Tester which
test the complete capacity of a battery and also can identify a faulty
batteries.
So in this blog, we take a look on these steps are:-
>>Why Capacity Tester…?
>>Components Required
>>Circuit Diagram
>>Code for Arduino
Why Capacity Tester…?
Why do we use Capacity tester
instead of any normal load test for Li-ion batteries …? Because Instead of any
normal load test, Capacity Tester provide a complete information about your
battery with safety and indications and If we use any normal test with simple
load value this can be not accurate and heat up the battery which can be risky,
but in this case we need to charge up the battery completely full for first
time before we plug the battery on Capacity tester after we can use for
different current timing test with adjusting the value of current on the tester
with the push buttons.
Note: After we use any Li-Ion or Li-Po battery, First make
sure you are using safe electronic because Li-Po and Li-Ion Battery is highly
explosive and can be dangerous for you and also you can burn your hands, So
please make sure everything you use is OK and good and if you already use these
types of battery then fine or if you not know the complete information about
these batteries then check first on internet or anywhere. This is only
information blog post, I am not responsible for anything. Stay Safe.
Component Required
Arduino Nano x1
0’96 Inch OLED Display (SSD1306 OLED) x1
LM358 IC x1
IRFZ44 N Channel Mosfet Transistor x1
5 Ohms 5Watt Resistor x1
1M Resistor x1
470R Resistor x1
4.7K Resistor x2
100nF Capacitor x2
220uF Capacitor x1
Tactile Switch x3
18650 Battery Holder x1
Circuit
Diagram
Here is the circuit diagram for the Battery Capacity
Tester. In this diagram LM358 use as a OP-AMP IC which has connected with
Arduino’s Digital Pin 3. Connect a Buzzer in Digital Pin 9 of Arduino and 2
pull-up switches with Arduino Digital Pin 11 and 12 for UP/Start and Down
control. Analog A0 pin
for battery input. After all simply connect an OLED Display to it with 5V to
VCC, GND to GND, A4 to SDA and A5 to SCL pin.
Code
Now open Arduino IDE Copy the code paste into your IDE then compile and Upload. If you don’t have these libraries then first download it from here and install it into your Arduino IDE first with some few steps first go to the Sketch menu--> Include Library--> Add Zip Library now select where you put your files.
#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 -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
int Vo;
float R1 = 10000;
float logR2, R2, T;
const int Current [] = {0, 70, 100, 190, 350, 400, 500, 620, 700, 830, 910, 1000};
const int PWM_RES [] = {0, 1, 2, 4, 8, 9, 12, 15, 17, 20, 22, 24};
int l = 0;
const float Low_BAT_level = 3.4;
const byte PWM_Pin = 3;
const byte Buzzer = 9;
const int BAT_Pin = A0;
int PWM_Value = 0;
unsigned long Capacity = 0;
int ADC_Value = 0;
float Vcc = 5.04 ; // Voltage of Arduino 5V pin ( Mesured by Multimeter after connecting external 9V Supply )
float BAT_Voltage = 0;
float sample = 0;
byte Hour = 0, Minute = 0, Second = 0;
bool calc = false, Done = false;
Button UP_Button(11, 25, false, true);
Button Down_Button(12, 25, false, true);
// 'logo.jpg'
const unsigned char myBitmap [] PROGMEM = {
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};
// Array of all bitmaps for convenience. (Total bytes used to store images in PROGMEM = 1040)
void setup () {
Serial.begin(9600);
pinMode(PWM_Pin, OUTPUT);
pinMode(Buzzer, OUTPUT);
analogWrite(PWM_Pin, PWM_RES[l]);
UP_Button.begin();
Down_Button.begin();
display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
display.clearDisplay();
display.drawBitmap(0, 0, myBitmap, 128, 64, WHITE);
display.display();
delay(3500);
display.setTextColor(WHITE);
display.clearDisplay();
display.setTextSize(2);
display.setCursor(0, 0);
display.print("Adjust ");
display.setCursor(2, 15);
display.print("Current:");
display.setCursor(2, 40);
display.print("UP Down");
display.display();
}
//************************* End of Setup function *******************************
void loop() {
float c;
UP_Button.read();
Down_Button.read();
if (UP_Button.wasReleased() && l < 11 && calc == false)
{
display.setTextSize(2);
l = l + 1;
display.clearDisplay();
display.setCursor(2, 25);
display.print("Curr:");
display.print(String(Current[l]) + "mA");
display.display();
}
if (Down_Button.wasReleased() && l > 0 && calc == false)
{
l = l - 1;
display.clearDisplay();
display.setCursor(2, 25);
display.print("Curr:");
display.print(String(Current[l]) + "mA");
display.display();
}
if (UP_Button.pressedFor (1000) && calc == false)
{
analogWrite(PWM_Pin, PWM_RES[l]);
digitalWrite(Buzzer, HIGH);
delay(1500);
digitalWrite(Buzzer, LOW);
display.clearDisplay();
timerInterrupt();
}
}
//************************* End of Loop function *******************************
void timerInterrupt() {
float c;
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[l]) + "mA");
display.setCursor(2, 40);
display.print("Bat:" + String(BAT_Voltage) + "V" );
display.setCursor(63, 40);
Capacity = (Hour * 3600) + (Minute * 60) + Second;
Capacity = (Capacity * Current[l]) / 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[l]) / 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;
l = 0;
analogWrite(PWM_Pin, PWM_RES[l]);
digitalWrite(Buzzer, HIGH);
delay(100);
digitalWrite(Buzzer, LOW);
delay(100);
digitalWrite(Buzzer, HIGH);
delay(100);
digitalWrite(Buzzer, LOW);
delay(100);
}
delay(1000);
}
}
After all must check everything has connected properly to the board or not short any wire with each other because Li-Ion Battery can burn your Arduino or other components then you can use this.
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