Oven Timer Functionality - Counting by 1's and 10s

Projects Programming
3

You are in luck, because a long while ago another person had a similar problem, and I helped him with the code.

const byte buttonPin1 = 2; // Up button
const byte buttonPin2 = 3; // Down Button

boolean buttonState1 = 0;
boolean lastReading1 = 0;
boolean buttonState2 = 0;
boolean lastReading2 = 0;
unsigned long onTime1 = 0, onTime2 = 0;
unsigned long interval = 1000;
unsigned long holdAmount = 5;
int count = 0, lastCount;

void setup() { 
  //pinMode(ledPin, OUTPUT);      
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);

  Serial.begin(115200);  
}

void loop()
{ 
  buttonState1 = digitalRead(buttonPin1);
  buttonState2 = digitalRead(buttonPin2);

  if (buttonState1 == HIGH && lastReading1 == LOW)
  {
    onTime1 = millis();
    count < 60 ? count++ : count = 0;
  }
  if (buttonState2 == HIGH && lastReading2 == LOW) 
  {
    onTime2 = millis();
    count > 0 ? count-- : count = 59;
  }

  //held
  if (buttonState1 == HIGH && lastReading1 == HIGH) 
  { 
    if ((millis() - onTime1) > interval )    
    {
      onTime1 = millis();
      count < 60? count += holdAmount : count = 0;
      lastReading1 = LOW;
    } 
  }
  if (buttonState2 == HIGH && lastReading2 == HIGH) 
  { 
    if ((millis() - onTime2) > interval )
    {
      onTime2 = millis();
      count > 0 ? count -= holdAmount : count = 59;
      lastReading2 = LOW;
    } 
  }
  if(count != lastCount)
  {
   Serial.println(count);
   lastCount = count;
  }
  lastReading1 = buttonState1;
  lastReading2 = buttonState2;
}