#define potent_pin 0
int val;
bool system_on = false, flag = false;
void setup() {
  Serial.begin(9600);
  pinMode(9, INPUT_PULLUP);
}
uint32_t btnTimer = 0;
void loop() {
  bool btnState = !digitalRead(9);
  if (!flag && btnState && millis() - btnTimer > 100){
    btnTimer = millis();
    system_on = !system_on;
    flag = true;
  }
    if (!btnState && flag) {  // обработчик отпускания
    flag = false;  
  }
  if (system_on){
  val = analogRead(potent_pin);
  val = map(val, 0, 1023, 0, 10);
  val = constrain(val, 0, 10);
  if (val == 0){
    digitalWrite(12, LOW);
    digitalWrite(11, LOW);
    digitalWrite(10, LOW);
  } else if (val < 3){
    digitalWrite(12, HIGH);
    digitalWrite(11, LOW);
    digitalWrite(10, LOW);
  } else if (val < 6){
    digitalWrite(12, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(10, LOW);
  } else {
    digitalWrite(12, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(10, HIGH);
  }
  } else {
    digitalWrite(12, LOW);
    digitalWrite(11, LOW);
    digitalWrite(10, LOW);
  }
  delay(30);
}