#define pinbtn 2
#define LEDpin 5

boolean flag; //+-
boolean flag1; //press/depress +
boolean flag2; //press/depress -

int sum;
int shim;
int maxs = 10; //max
int mins = 0; //min

long last; //lattime

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

  pinMode(2, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (millis() - last > 300) {
    if (!digitalRead(pinbtn) & flag == 0 & sum < maxs) {
      sum = sum + 1;
      Serial.println(sum);
      flag1 = 1;
      last = millis();
    }
    else {
      if (!digitalRead(pinbtn) & flag == 0 & sum == maxs) {
        Serial.println("MAX");
        delay(900);
        flag = 1;
      }
      else {
        if (!digitalRead(pinbtn) & flag == 1 & sum > mins) {
          sum = sum - 1;
          Serial.println(sum);
          flag2 = 1;
          last = millis();
        }
        else {
          if (!digitalRead(pinbtn) & flag == 1 & sum == mins) {
            Serial.println("MIN");
            delay(900);
            flag = 0;
          }
          else {
            if  (flag1 == 1 || flag2 == 1) {
              flag1 = 0;
              flag2 = 0;
              flag = !flag;
            }
          }
        }
      }
    }
  }
  shim = map(sum, 0, 10, 0, 255);
  analogWrite(LEDpin, shim);
}