Relay Controller rev_03

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    - Project: Relay Controller
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2025-08-13 12:40:49

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* esp32 with i2c display,one relay out,one swich for */
    /* start, one swich for stop, one swich for time */
    /* setting up,one swich for time setting down,one */
    /* ds18b20 temperature sensor. */
/****** END SYSTEM REQUIREMENTS *****/


/********* User code review feedback **********
#### Feedback 1 ####
- not working

#### Feedback 2 ####
- no oled in my scope

********* User code review feedback **********/

/* START CODE */
/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// Define pins for switches
const int startSwitchPin = 2;   // Start button
const int stopSwitchPin = 3;    // Stop button
const int timeUpSwitchPin = 4;  // Time setting up
const int timeDownSwitchPin = 5; // Time setting down

// Define pin for relay
const int relayPin = 6;

// Define pin for DS18B20 temperature sensor
const int oneWireBusPin = 7;

// Create OneWire and DallasTemperature objects
OneWire oneWire(oneWireBusPin);
DallasTemperature sensors(&oneWire);

// Variables for system state
bool systemRunning = false;
int temperature = 0;
int setTimeMinutes = 0;

void setup() {
  // Initialize serial communication
  Serial.begin(115200);

  // Initialize pins
  pinMode(startSwitchPin, INPUT_PULLUP);
  pinMode(stopSwitchPin, INPUT_PULLUP);
  pinMode(timeUpSwitchPin, INPUT_PULLUP);
  pinMode(timeDownSwitchPin, INPUT_PULLUP);
  pinMode(relayPin, OUTPUT);

  // Initialize relay
  digitalWrite(relayPin, LOW); // Relay off

  // Initialize temperature sensor
  sensors.begin();

  // Initial status message
  Serial.println("System initialized");
}

void loop() {
  handleSwitches();
  readTemperature();
  // Optional: Send status over serial for debugging
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" C, Set Time: ");
  Serial.print(setTimeMinutes);
  Serial.print(" min, Status: ");
  Serial.println(systemRunning ? "RUNNING" : "STOPPED");
  delay(200); // Loop delay
}

void handleSwitches() {
  // Read switch states
  bool startState = digitalRead(startSwitchPin) == LOW;
  bool stopState = digitalRead(stopSwitchPin) == LOW;
  bool timeUpState = digitalRead(timeUpSwitchPin) == LOW;
  bool timeDownState = digitalRead(timeDownSwitchPin) == LOW;

  if (startState) {
    systemRunning = true;
    digitalWrite(relayPin, HIGH); // Turn relay on
  }
  if (stopState) {
    systemRunning = false;
    digitalWrite(relayPin, LOW); // Turn relay off
  }
  if (timeUpState) {
    setTimeMinutes++;
  }
  if (timeDownState) {
    if (setTimeMinutes > 0) {
      setTimeMinutes--;
    }
  }
}

void readTemperature() {
  sensors.requestTemperatures();
  temperature = sensors.getTempCByIndex(0);
}