Arduino sketch that turns 8 LEDs into a byte adder using two buttons.

LED_BYTE_CALCULATOR.ino

const int pot = A15;
const int pushButton = 22;
const int pushButton2 = 27;
int bitList[8] = {
};
int pinSet[] = {
  13,11,9,7,5,3,14,16};
byte sensorValue = 0;
int op1;
int op2;



void setup(){
  for (int i = 0; i < 8; i++) {
    pinMode(pinSet[i], OUTPUT);
  }
  Serial.begin(9600);
  pinMode(pushButton, INPUT_PULLUP);
  pinMode(pushButton2, INPUT_PULLUP);
}


void loop() {
  int buttonState = digitalRead(pushButton);
  int buttonState1 = digitalRead(pushButton2);
  if (buttonState == HIGH && buttonState1 == HIGH) {
    sensorValue = analogRead(pot)/4;
    String potValue = String(sensorValue, BIN);
    Serial.println(potValue);
    for (int i = 0; i < 8; i++) {
      bitList[7-i] = bitRead(sensorValue, i);
    }
    for (int i = 0; i < 8; i++) {
      if (bitList[i] == 1) {
        digitalWrite(pinSet[7-i], HIGH);
      } 
      else {
        digitalWrite(pinSet[7-i], LOW);
      }
    }
  } 
  else if (buttonState == LOW && buttonState1 == HIGH) {
    for (int i = 0; i < 8; i++) {
      digitalWrite(pinSet[i], LOW);
    }
    delay(500);
    sensorValue = analogRead(pot)/4;
    String potValue = String(sensorValue, BIN);
    Serial.println(potValue);
    for (int i = 0; i < 8; i++) {
      bitList[7-i] = bitRead(sensorValue, i);
    }
    for (int i = 0; i < 8; i++) {
      if (bitList[i] == 1) {
        digitalWrite(pinSet[7-i], HIGH);
      } 
      else {
        digitalWrite(pinSet[7-i], LOW);
      }
    }
    op1 = sensorValue;
  } 
  if (buttonState1 == LOW && buttonState == LOW) {
    sensorValue = analogRead(pot)/4;
    op2 = sensorValue;
    String potValue = String((op1 + op2), BIN);
    Serial.println(potValue);
    for (int i = 0; i < 8; i++) {
      bitList[7-i] = bitRead(op1 + op2, i);
    }
    for (int i = 0; i < 8; i++) {
      if (bitList[i] == 1) {
        digitalWrite(pinSet[7-i], HIGH);
      } 
      else {
        digitalWrite(pinSet[7-i], LOW);
      }
    }
  }
}