ESP32 Essentials rev_02

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    - Project: ESP32 Essentials
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2025-08-13 12:39:59

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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 *****/


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/* START CODE */
/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// Define display parameters
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET    -1 // Reset pin # (or -1 if sharing Arduino reset pin)

// Instantiate display object
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// 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 display
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Loop forever
  }
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.println("Initializing...");
  display.display();

  // 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 display update
  updateDisplay();
}

void loop() {
  handleSwitches();
  readTemperature();
  updateDisplay();
  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);
}

void updateDisplay() {
  display.clearDisplay();
  display.setCursor(0,0);
  display.println("ESP32 I2C Display");
  display.println("-----------------");
  display.print("Temp: ");
  display.print(temperature);
  display.println(" C");
  display.print("Set Time: ");
  display.print(setTimeMinutes);
  display.println(" min");
  display.println(systemRunning ? "Status: RUNNING" : "Status: STOPPED");
  display.display();
}