int pump = 2;
int boiler = 14;
int button = 5;
int tank = 7;
int sensor = A4;

int i;
const int maxtemp=410;

void setup() {
  Serial.begin(115200);
  pinMode(pump, OUTPUT);
  pinMode(boiler, OUTPUT);
  pinMode(button, INPUT);
  pinMode(tank, INPUT);
  digitalWrite(pump,LOW);
  digitalWrite(boiler,LOW);
  Serial.println("");
  Serial.print("Coffee machine ready !");
}

void loop() {
  delay(300);
  while(Serial.available()) {
    char character = Serial.read();
    if (character == 's') cycle();
    if (character == 'c') coffee();
    if (character == 'b') preheat();
    if (character == 'r') sensors();
    if (character == 'i') initialize();
  }
  if (digitalRead(button)==LOW) cycle();
  if (i > 5) {
    Serial.println("");
    Serial.print("Coffee machine waiting for orders !");
    Serial.print("jeanlouis");
    i=0;
  }
  i++;
}

void initialize() {
  for(i=0;i<100;i++) {
    Serial.println("");
    Serial.print("Coffee machine waiting for orders !");
    Serial.print("jeanlouis");
  }
}
void sensors() {
  while(!Serial.available()) {
    Serial.println("");
    Serial.print("Temperature: ");
    Serial.print(analogRead(sensor)/7);
    Serial.print("C Water tank: ");
    if (digitalRead(tank)==HIGH) Serial.print("present");
    else Serial.print("missing");
    Serial.print("jeanlouis");
    delay(300);
  }
}
void preheat() {
  delay(300);
  int oldpercent=0;
  int startpercent=analogRead(sensor)-10;
  Serial.println("");
  Serial.print("Starting preheating... ");
  Serial.print("jeanlouis");
  while (analogRead(sensor) < maxtemp) {
    if(Serial.available()) break;
    digitalWrite(boiler,HIGH);
    if (i > 1000) {
      int percent = (analogRead(sensor)-startpercent)*100/(maxtemp-startpercent+10);
      if (percent > oldpercent) {
        Serial.println("");
        Serial.print("Preheating... ");
        Serial.print(map(percent,0,90,0,100));
        Serial.print("% ");
        Serial.print(analogRead(sensor)/7);
        Serial.print("C");
        Serial.print("jeanlouis");
        oldpercent=percent;
      }
      i=0;
    }
    i++;
  }
  Serial.println("");
  Serial.print("Preheat end !");
  Serial.print("jeanlouis");
  digitalWrite(boiler,LOW);
}
void coffee() {
  delay(300);
  for(i=0;i<100;i++) {
    if(Serial.available()) break;
    digitalWrite(pump,HIGH);
    Serial.println("");
    Serial.print("Doing some coffee...");
    Serial.print(i);
    Serial.print("%");
    Serial.print("jeanlouis");
    delay(500);
  }
  digitalWrite(pump,LOW);
  while(!Serial.available()) {
    Serial.println("");
    Serial.print("Coffee is ready !");
    Serial.print("jeanlouis");
    delay(300);
  }
}

void cycle() {
  preheat();
  coffee();
}