Please Help me in understanding this below Arduino Code please explain in detail and help me in understanding their function and uses.

#include #include #include #include #include

U8GLIB_SH1106_128X64 u8g(U8G_I2C_OPT_NONE); Adafruit_INA219 ina219; #define MOSFET_Pin 13

int value = 0; unsigned long previousMillis = 0; unsigned long interval = 100; float Bat_High = 4.3; // Battery High Voltage float Bat_Low = 2.9; // Discharge Cut Off Voltage float shuntvoltage = 0; float busvoltage = 0; float current_mA = 0; float loadvoltage = 0; float energy = 0; float Capacity = 0.0; unsigned long previousMilliss = 0; // Previous time in ms unsigned long millisPassed = 0;

void setup() { Serial.begin(9600); ina219.begin(); pinMode(MOSFET_Pin, OUTPUT); digitalWrite(MOSFET_Pin, LOW);

}

void ina219values() { millisPassed = millis() - previousMilliss; shuntvoltage = ina219.getShuntVoltage_mV(); busvoltage = ina219.getBusVoltage_V(); current_mA = ina219.getCurrent_mA(); loadvoltage = busvoltage + (shuntvoltage / 1000); Capacity = Capacity + current_mA * (millisPassed / 3600000.0); previousMilliss = millis(); }

void loop() { ina219values(); while(Serial.available()) { value = Serial.read(); } if (value == '1'){ digitalWrite (MOSFET_Pin, HIGH); } else if (value == '0'){ digitalWrite (MOSFET_Pin, LOW); } if ( loadvoltage > Bat_High){ digitalWrite(MOSFET_Pin, LOW); // Turned Off the MOSFET // No discharge Serial.println("high"); delay(1000); } else if(loadvoltage < Bat_Low){ digitalWrite(MOSFET_Pin, LOW); // Turned Off the MOSFET // No discharge Serial.println("low"); delay(1000); } else if(loadvoltage >= Bat_Low && loadvoltage < Bat_High ){ unsigned long currentMillis = millis(); if (currentMillis - previousMillis >= interval) { previousMillis = currentMillis; ina219values(); } Serial.print(loadvoltage); Serial.print(","); Serial.print(current_mA); Serial.print(","); Serial.println(Capacity); delay(1000); } u8g.firstPage(); do { draw(); } while( u8g.nextPage() ); }

void draw(void) { u8g.setFont(u8g_font_fub14r); // select font if ( loadvoltage < 1.5){ u8g.setPrintPos(10,40); // set position u8g.println("No Battery!"); } else if ( loadvoltage > Bat_High){ u8g.setPrintPos(25,40); // set position u8g.println("High-V!"); } else if(loadvoltage < Bat_Low){ u8g.setPrintPos(25,40); // set position u8g.println("Low-V!"); } else if(loadvoltage >= Bat_Low && loadvoltage < Bat_High ){ u8g.drawStr(0, 20, "Volt: "); // put string of display at position X, Y u8g.drawStr(0, 40, "Curr: "); u8g.drawStr(0, 60, "mAh: "); u8g.setPrintPos(58,20); // set position u8g.print( loadvoltage,2); // display Battery Voltage in Volt u8g.println("V"); u8g.setPrintPos(58,40); // set position u8g.print( current_mA,0); // display current in mA u8g.println("mA"); u8g.setPrintPos(58, 60); // set position u8g.print( Capacity ,1); // display capacity in mAh } }