/*
  Arduino | hardware-help
  Could you doulbe check the blueprint of my first arduino project?

  Ben.Ninefire — Saturday, November 29, 2025 3:26 AM
  I want to make a device that can push the button on the heater of
  my van (5x) to start the heating 8 a.m. and 10 p.m. if the temperature
  is under 0 C degree for a month and a half while I am away.

  Hardwares:
  -Nano Module with CH340 Microchip
  -RTC Module for Arduino and RPi with Battery
  -SG90 9G Micro Servo Motor
  -DS18B20 Digital Temperature Sensor TO92
*/

#include <OneWire.h>
#include <DallasTemperature.h>
#include <Servo.h>
#include <RTClib.h>

const unsigned long ONE_SEC = 1000;
const int SERVO_PIN = A0;
const int BTN_PIN = A1;
const int LED_PIN = A2;

unsigned long prevTime = 0;

OneWire oneWire(A3);
DallasTemperature sensor(&oneWire);
RTC_DS1307 rtc;
Servo servo;

void startHeater()  {
  for (int count = 0; count < 5; count++) {
    digitalWrite(LED_PIN, HIGH);
    servo.write(0);
    delay (500);
    digitalWrite(LED_PIN, LOW);
    servo.write(90);
    delay(500);
  }
}

void setup() {
  Serial.begin(115200);
  sensor.begin();
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (true) {};
  }
  pinMode(BTN_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);
  servo.attach(SERVO_PIN);
  servo.write(90);
}

void loop() {
  char buffer[24];

  if (millis() - prevTime >= ONE_SEC) {
    prevTime = millis();

    DateTime now = rtc.now();
    snprintf(buffer, 24, "%2d/%2d/%4d %02d:%02d:%02d",
             now.day(), now.month(), now.year(),
             now.hour(), now.minute(), now.second()
            );
    Serial.println(buffer);

    sensor.requestTemperatures();
    Serial.print("Temperature is: ");
    Serial.print(sensor.getTempCByIndex(0));
    Serial.println("°C");
    Serial.println();
  }

  if (digitalRead(BTN_PIN) == LOW)  {
    startHeater();
  }

}