// Include the libraries.
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Fonts/FreeSans9pt7b.h>

// important perameters
bool charging=true;
bool discharging=false;

bool isusb=false;        //usb port connected = true, usb port not connected = false
bool islaptop=true;     //dc port connected = true, dc port not connected = false
bool istypec=false;      //typec port connected = true, typec port not connected = false


int voltageIndex = 0; // Index to track the current voltage in the list
String voltages[] = {"5V", "9V", "12V" , "15V", "16.5V", "19.5V", "20V","24V"}; // List of available voltages
float voltage=0;
int count=0;
int outvoltage=0;
//String setvoltage= voltages[voltageIndex];
float setvoltage =0;
int settemperature=0;
int currenttemperature=0;
int current=0;
int out_current=0;
int outpower=outvoltage*out_current;
int setpower=0;
int btn_status=0;
int batteryPercent = count;

const int toggleButtonPin = 2;    // Replace with your button pin number
int buttonPushCounter = 1;   // counter for the number of button presses
boolean buttonState = LOW;         // current state of the button
boolean lastButtonState = LOW;     // previous state of the butto
bool isYesSelected = true; // Initial state: Yes is selected
bool buttonWasPressed = false;
bool longPressDetected = false;

// Debounce parameters
unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers
unsigned long pressStartTime = 0; // Added declaration
const unsigned long longPressDuration = 1000; // Adjust long-press duration as needed (in milliseconds)

static unsigned long lastToggleTime = 0;
int currentButtonState = digitalRead(toggleButtonPin);


const float rpiPicoVCC = 3.3;//Your RPI pico voltage
unsigned long ValueR1 = 100000;
unsigned long ValueR2 = 15000;
double Voltage_Source = 24;
const int snVoltagePin = 26;//the pin connecting the voltage. 
const int inputResolution =4095;//works with most RPI pico boards
const float average_of = 500;//Average of 500 readings
//**************sensors
const int currentPin = 27;  // Analog input pin for current
const int ACS712_mVperA = 100;  // ACS712 sensitivity (mV per Ampere)
const int buck_sw = 12;        //Buck trigger
const int boost_sw = 13;         //Boost trigger

bool overVoltageDetected=true;
bool overCurrentDetected=false;
bool underVoltageDetected=false;
bool overTemperatureDetected=true;

Adafruit_SSD1306 display(128,64,&Wire,-1);

// Initial setup
void setup(){ 
  //Draw Logo
  logo();
  // Set the button pin as an input
  
  pinMode(snVoltagePin, INPUT);
  pinMode(currentPin, INPUT);
  pinMode(buck_sw, OUTPUT);
  digitalWrite(buck_sw, HIGH);
  pinMode(boost_sw, OUTPUT);
  digitalWrite(boost_sw, HIGH);
  pinMode(toggleButtonPin, INPUT);
}
// Main loop
void loop(){
  voltagesetup();
  readVoltage();
  getVoltageAverage();
  readcurrent();
  navigation();
  count +=1;
  batteryPercent = count;
  if(count>=100)
    {count=0;}
  switch (buttonPushCounter) {
    case 1:
      main_page();
      break;
    case 2:
      settings_page();
      voltage_setup();
      break;
    case 3:
      settings_page();
      battery_info();
      break;
    case 4:
      settings_page();
      poweroff();
      break;
    case 5:
      settings_page();
      exit();
      break;  
  }
  display.display();

  button();
}

//////************************************** Define functions to call back *********************************************************\\\\\\


bool isToggleButtonPressed() {
  return digitalRead(toggleButtonPin) == LOW;
}

void navigation(){

  unsigned long currentTime = millis();

  if (isToggleButtonPressed()) {
    if (!buttonWasPressed) {
      buttonWasPressed = true;
      longPressDetected = false;
      pressStartTime = millis(); // Record the press start time
    }
    if (currentTime - pressStartTime >= longPressDuration && !longPressDetected) {
      longPressDetected = true;
      if (isYesSelected) {
        
      } else {
        display.clearDisplay();
        display.setCursor(30, 20);
        display.println("Long press on YES!");
        display.display();
        delay(2000); // Display the message for 2 seconds (adjust as needed)
        display.clearDisplay();
      }
    }
  } else {
    if (buttonWasPressed) {
      buttonWasPressed = false;
      // Button released after a press
      if (!longPressDetected) {
        // Toggle between "Yes" and "No" if no long press was detected
        isYesSelected = !isYesSelected;
        updateDisplay();
      }
    }
  }
}


void button(){
  bool redraw=false;
  // Read the state of the switch into a local variable:
  buttonState = digitalRead(toggleButtonPin);
  // check to see if you just pressed the button
  // (i.e. the input went from LOW to HIGH), and you've waited long enough
  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:
    if (buttonState != lastButtonState) {
       // reset the debouncing timer
       lastDebounceTime = millis();
      if (buttonState == HIGH) {
        // if the current state is HIGH then the button
        // went from off to on:
        redraw=true;
        buttonPushCounter++;  // add one to counter
        if (buttonPushCounter > 4) {
          buttonPushCounter = 0;
        }
        Serial.println(buttonPushCounter);
      }
      lastButtonState = buttonState;
    }
     if (redraw == true ) {
    display.clearDisplay();
  }
}


void updateDisplay() {
  display.clearDisplay();
  // Display the selected option ("Yes" or "No") with a rectangle around it
  if (isYesSelected) {
    display.drawRoundRect(97, 36, 21, 15, 4, WHITE); // Rectangle around "Yes"
  } else {
    display.drawRoundRect(63, 36, 21, 15, 4, WHITE); // Rectangle around "No"
  }
  display.display();
}
      //MAIN PAGE
void main_page(){
  laptop();
  usb();
  typec();
  charge_status();
  power();
  protection();
}
void laptop(){
  // DC port occupied
  if(islaptop==true){
    display.drawRoundRect(0,0,20,20,4,WHITE);
    display.setTextSize(2);
    display.setCursor(5,3);
    display.setTextColor(WHITE);
    display.print("L");
    display.display();
  }
  else{
    display.print("");
  }
}
void usb(){
  // USB port occupied
  if(isusb==true){
    display.drawRoundRect(28,0,20,20,4,WHITE);
    display.setTextSize(2);
    display.setCursor(33,3);
    display.setTextColor(WHITE);
    display.print("U");
    display.display();
  }
  else{
    display.print("");
  }
}
void typec(){
  // Type C port occupied
  if(istypec==true){
    display.drawRoundRect(56,0,20,20,4,WHITE);
    display.setTextSize(2);
    display.setCursor(61,3);
    display.setTextColor(WHITE);
    display.print("C");
    display.display();
  }
  else{
    display.print("");
  }
}
void charge_status(){
  // Blink battery status and battery percentage indicator while charging 
  if(charging == true){
    display.fillRoundRect(91, 5.5, 3, 7, 1, WHITE);//x,y,width,height top rect
    display.drawRoundRect(95, 0, 30, 17, 4, WHITE);//x,y,width,height, radius bottom rect BATTERY
    display.fillRoundRect(97, 2, 26, 13, 3, WHITE);//inside rectangle
    display.setCursor(98,5);
    display.setTextColor(BLACK);
    display.setTextSize(1);
    display.print(batteryPercent);
    display.print("%");
    display.display();
    
    display.fillRoundRect(91, 5.5, 3, 7, 1, BLACK);//x,y,width,height top rect
    display.drawRoundRect(95, 0, 30, 17, 4, BLACK);//x,y,width,height, radius bottom rect BATTERY
    display.fillRoundRect(97, 2, 26, 13, 3, BLACK);//inside rectangle
    display.setCursor(98,5);
    display.setTextColor(WHITE);
    display.setTextSize(1);
    display.print(batteryPercent);
    display.print("%");
    delay(400);
  }
  //Static battery status and battery percentage indicator while discharging
  else if(discharging == true){
   display.fillRoundRect(91, 5.5, 3, 7, 1, WHITE);//x,y,width,height top rect
   display.drawRoundRect(95, 0, 30, 17, 4, WHITE);//x,y,width,height, radius bottom rect BATTERY
   display.fillRoundRect(97, 2, 26, 13, 3, WHITE);//inside rectangle
   display.setCursor(98,5);
   display.setTextSize(1);
   display.setTextColor(BLACK);
   display.print(batteryPercent);
   display.print("%");
  }
}
void power(){
  //set voltage show for dc port
  display.setTextColor(WHITE);
  display.setTextSize(2);
  display.setCursor(90,30);
  display.println(voltages[voltageIndex]);

  //OUT block
  display.fillRoundRect(0,48, 22, 15, 3, WHITE);
  display.setTextSize(1);
  display.setCursor(3,52);
  display.setTextColor(BLACK);
  display.print("OUT");

  //OUT POWER
  display.setTextSize(2);
  display.setCursor(30,50);
  display.setTextColor(WHITE);
  display.print("90 W");

  //IN block
  display.fillRoundRect(0,31, 22, 15, 3, WHITE);
  display.setTextSize(1);
  display.setCursor(5,35);
  display.setTextColor(BLACK);
  display.print("IN");
  
  //IN POWER
  display.setTextSize(2);
  display.setCursor(30,30);
  display.setTextColor(WHITE);
  display.print("15 W");

  display.display();
}
void protection(){
  temperature();
  vol();
  curr();

}
void temperature(){
  //Over temperature detection and indication
  if(currenttemperature>settemperature){
    display.fillRoundRect(90,48,17,15,2,WHITE);
    display.setTextSize(1);
    display.setCursor(93,52);
    display.setTextColor(BLACK);
    display.print("OT");
    overTemperatureDetected==true;
    display.display();
    pinMode(buck_sw, OUTPUT);
    digitalWrite(buck_sw, LOW);

    pinMode(boost_sw, OUTPUT);
    digitalWrite(boost_sw, LOW);
  }
  else{
    display.print("");
  }
}
void vol(){
  //Overvoltage and Undervoltage detection and indication
  if(voltage>setvoltage){
    display.fillRoundRect(110,48,17,15,2,WHITE);
    display.setTextSize(1);
    display.setCursor(113,52);
    display.setTextColor(BLACK);
    overVoltageDetected==true;
    display.print("OV");
    pinMode(buck_sw, OUTPUT);
    digitalWrite(buck_sw, LOW);

    pinMode(boost_sw, OUTPUT);
    digitalWrite(boost_sw, LOW);
  }
  else if(voltage<setvoltage){
    display.fillRoundRect(110,48,17,15,2,WHITE);
    display.setTextSize(1);
    display.setCursor(113,52);
    display.setTextColor(BLACK);
    underVoltageDetected==true;
    display.print("UV");
    pinMode(buck_sw, OUTPUT);
    digitalWrite(buck_sw, LOW);

    pinMode(boost_sw, OUTPUT);
    digitalWrite(boost_sw, LOW);
  }
  else{
    display.print("");
  }
}

void curr(){
  //Overcurrent detection and indication
  if(outpower>setpower){
    display.fillRoundRect(110,48,17,15,2,WHITE);
    display.setTextSize(1);
    display.setCursor(113,52);
    display.setTextColor(BLACK);
    overCurrentDetected==true;
    display.print("OC");
    pinMode(buck_sw, OUTPUT);
    digitalWrite(buck_sw, LOW);

    pinMode(boost_sw, OUTPUT);
    digitalWrite(boost_sw, LOW);
  }
  else{
    display.print("");
  }
}
      //SETTING PAGE
void settings_page(){
  //Settings main page
  display.fillRoundRect(0,0,51,12,4,WHITE);
  display.setTextSize(1);
  display.setTextColor(BLACK);
  display.setCursor(2,3);
  display.println("SETTINGS");

  //Layout blocks
  display.drawRoundRect(0,15,51,49,4,WHITE);          //Options block
  display.drawRoundRect(54,0,74,64,4,WHITE);          //Info block
  
  //Options icon
  display.fillRoundRect(4,18,20,20,4,WHITE);
  display.setTextSize(2);
  display.setTextColor(BLACK);
  display.setCursor(9,21);
  display.println("V");

  display.fillRoundRect(27,18,20,20,4,WHITE);
  display.setTextSize(2);
  display.setTextColor(BLACK);
  display.setCursor(32,21);
  display.println("B");

  display.fillRoundRect(4,40,20,20,4,WHITE);
  display.setTextSize(2);
  display.setTextColor(BLACK);
  display.setCursor(9,43);
  display.println("O");

  display.fillRoundRect(27,40,20,20,4,WHITE);
  display.setTextSize(2);
  display.setTextColor(BLACK);
  display.setCursor(32,43);
  display.println("X");

  display.display();
}
void voltage_setup(){
  //Blinking
  display.fillRoundRect(4,18,20,20,4,BLACK);
  display.drawRoundRect(4,18,20,20,4,WHITE);
  delay(300);
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(9,21);
  display.println("V");

  //Selected option
  display.drawRoundRect(54,0,74,12,4,WHITE);
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(70,2);
  display.println("VOLTAGE");
  display.drawRoundRect(72,11,39,12,4,WHITE);
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(77,13);
  display.println("SETUP");

  //Set voltage
update_Display();

  //Change icon
  display.fillRoundRect(59,50,39,11,4,WHITE);
  display.setTextSize(1);
  display.setTextColor(BLACK);
  display.setCursor(61,52);
  display.println("CHANGE");

  display.display();
}
void battery_info(){
  //Blinking
  display.fillRoundRect(27,18,20,20,4,BLACK);
  display.drawRoundRect(27,18,20,20,4,WHITE);
  delay(300);
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(32,21);
  display.println("B");

  //Selected option
  display.drawRoundRect(54,0,74,12,4,WHITE);
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(70,2);
  display.println("BATTERY");
  display.drawRoundRect(73,11,35,12,4,WHITE);
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(79,13);
  display.println("INFO");

  //Percentage
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(57,27);
  display.println("PERCENTAGE");
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(100,36);
  display.println("100%");

  //Set voltage
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(57,50);
  display.println("VOLTAGE");
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(105,50);
  display.println("24V");

  display.display();
}
void poweroff(){
  //Blink
  display.fillRoundRect(4,40,20,20,4,BLACK);
  display.drawRoundRect(4,40,20,20,4,WHITE);
  delay(300);
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(9,43);
  display.println("O");

  //Selected option
  display.drawRoundRect(54,0,74,12,4,WHITE);
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(65,2);
  display.println("POWER OFF");

  //Choices 
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(65,40);
  display.println("NO");
  display.fillRoundRect(100,36,21,15,4,WHITE);
  display.setTextSize(1);
  display.setTextColor(BLACK);
  display.setCursor(102,40);
  display.println("YES");

  display.display();
}
void exit(){
  //Blink
  display.fillRoundRect(27,40,20,20,4,BLACK);
  display.drawRoundRect(27,40,20,20,4,WHITE);
  delay(300);
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(32,43);
  display.println("X");

  //Selected option
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(69,4);
  display.println("EXIT");
  display.drawLine(55,21,126,21, WHITE);

  //Choices 
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(65,40);
  display.println("NO");
  display.fillRoundRect(100,36,21,15,4,WHITE);
  display.setTextSize(1);
  display.setTextColor(BLACK);
  display.setCursor(102,40);
  display.println("YES");

  display.display();
}


void readVoltage(){
    int A0Value = analogRead(snVoltagePin);
    float voltage_sensed = A0Value * (rpiPicoVCC / (float)inputResolution); 
//  Serial.print("voltage_sensed:");
//  Serial.print(voltage_sensed);       
  //voltage = voltage_sensed * ( 1 + ( (float) ValueR2 /  (float) ValueR1) );
}//readVoltage()

float getVoltageAverage(){
  float voltage_temp_average=0;
    for(int i=0; i < average_of; i++)
    {
       readVoltage();
       voltage_temp_average +=voltage;
    }
      
  return voltage_temp_average / average_of;
}//getVoltageAverage

void readcurrent(){
  int currentRaw = analogRead(currentPin); // Convert the raw ADC value to current (in Amperes)
  float current = -(currentRaw - 2048) / ACS712_mVperA;  // Assuming ACS712 output is centered at Vref/2
}

void voltagesetup(){
  if (currentButtonState == LOW && !buttonWasPressed && buttonPushCounter==1) {
    buttonWasPressed = true;
  }

  // Check for debouncing
  if (currentButtonState == HIGH && buttonWasPressed) {
    unsigned long currentTime = millis();
    if (currentTime - lastToggleTime >= debounceDelay) {
      // Button release detected
      lastToggleTime = currentTime;
      buttonWasPressed = false;

      // Change the voltage to the next value in the list
      voltageIndex = (voltageIndex + 1) % (sizeof(voltages) / sizeof(voltages[0]));
      
      
      // Print the selected voltage to the serial monitor
      Serial.print("Selected Voltage: ");
      Serial.println(voltages[voltageIndex]);
    }
  }
}

void update_Display() {
  

  // Display the selected voltage
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(73, 29);
  display.println(voltages[voltageIndex]);

  // Your existing code for buttons and UI elements goes here

  display.display();
}

void buck(){

}

void boost(){

}

void logo(){
  // 'Logo bitmap with volta+', 128x64px
  static const uint8_t image_data[1024]= {
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0x89, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xc8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfd, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xcc, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xd8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xfc, 0x00, 0x07, 0x81, 0x99, 0xf0, 0xfc, 0x38, 0xfe, 0x1e, 0x3f, 0x80, 0x7c, 0x7f, 0x0f, 0xff, 
  0xfc, 0x00, 0x07, 0x81, 0xff, 0xf0, 0xf8, 0x78, 0x7e, 0x1e, 0x3f, 0x00, 0x3c, 0x7e, 0x1f, 0xff, 
  0xfc, 0x00, 0x07, 0x80, 0xff, 0xf0, 0xf0, 0xf8, 0x3e, 0x1e, 0x3e, 0x04, 0x1c, 0x7c, 0x3f, 0xff, 
  0xfe, 0x00, 0x0f, 0x00, 0xff, 0xf0, 0xe1, 0xf8, 0x3e, 0x1e, 0x3c, 0x3f, 0x3c, 0x78, 0x7f, 0xff, 
  0xff, 0xe0, 0xff, 0x00, 0x7f, 0xf0, 0xc3, 0xf8, 0x1e, 0x1e, 0x38, 0x7f, 0xfc, 0x70, 0xff, 0xff, 
  0xff, 0xe0, 0xfe, 0x00, 0x7f, 0xf0, 0x87, 0xf8, 0x0e, 0x1e, 0x38, 0x7f, 0xfc, 0x61, 0xff, 0xff, 
  0xff, 0xe0, 0xfe, 0x08, 0x3f, 0xf0, 0x07, 0xf8, 0x06, 0x1e, 0x38, 0xff, 0xfc, 0x03, 0xff, 0xff, 
  0xff, 0xe0, 0xfc, 0x18, 0x3f, 0xf0, 0x07, 0xf8, 0x82, 0x1e, 0x38, 0xff, 0xfc, 0x03, 0xff, 0xff, 
  0xff, 0xe0, 0xfc, 0x1c, 0x3f, 0xf0, 0x03, 0xf8, 0xc0, 0x1e, 0x38, 0xff, 0xfc, 0x01, 0xff, 0xff, 
  0xff, 0xe0, 0xf8, 0x00, 0x1f, 0xf0, 0x03, 0xf8, 0xe0, 0x1e, 0x38, 0x7f, 0xfc, 0x00, 0xff, 0xff, 
  0xff, 0xe0, 0xf8, 0x00, 0x1f, 0xf0, 0x61, 0xf8, 0xf0, 0x1e, 0x38, 0x7f, 0xfc, 0x30, 0x7f, 0xff, 
  0xff, 0xe0, 0xf0, 0x00, 0x0f, 0xf0, 0xf0, 0xf8, 0xf8, 0x1e, 0x3c, 0x3f, 0x3c, 0x38, 0x7f, 0xff, 
  0xff, 0xe0, 0xf0, 0x00, 0x0f, 0xf0, 0xf0, 0x78, 0xf8, 0x1e, 0x3c, 0x0e, 0x1c, 0x7c, 0x3f, 0xff, 
  0xff, 0xe0, 0xf0, 0x7e, 0x07, 0xf0, 0xf8, 0x78, 0xfc, 0x1e, 0x3e, 0x00, 0x1c, 0x7e, 0x1f, 0xff, 
  0xff, 0xe0, 0xe0, 0xff, 0x07, 0xf0, 0xfc, 0x38, 0xfe, 0x1e, 0x3f, 0x80, 0x7c, 0x7f, 0x0f, 0xff, 
  0xff, 0xe1, 0xf1, 0xff, 0x8f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf3, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
  };
  
  // (internal charge ckt ON,I2C address)
  display.begin(SSD1306_SWITCHCAPVCC,0X3C);
  delay(1000);
  display.clearDisplay();  
  delay(200);
  // Draw bitmap on the screen
  display.drawBitmap(5, 10, image_data, 128, 64,1);
  display.setTextSize(2);
  display.setCursor(55,50);
  display.setTextColor(WHITE);
  display.print("VOLTA+");
  display.display();
  delay(2000);
  display.clearDisplay();
}