Relay Controller rev_02

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    - Project: Relay Controller
    - Source Code NOT compiled for: ESP8266 NodeMCU V1.0
    - Source Code created on: 2025-08-13 13:05:56

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* esp32 with i2c display, swich 1 for start */
    /* button,swich 2 for stop button,swich 3 for delay */
    /* time setting up,swich 4 for delay time setting */
    /* down.relay 1 output. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */
/****** DEFINITION OF LIBRARIES *****/
// Include Wire library for I2C communication
#include <Wire.h>
// Include a library for the I2C display (assuming SSD1306 or similar, adjust if needed)
#include <Adafruit_SSD1306.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)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Define pin assignments
const int buttonStartPin = D1;   // Switch 1 for start
const int buttonStopPin = D2;    // Switch 2 for stop
const int buttonDelayPin = D3;   // Switch 3 for delay time setting
const int switchDelayPin = D4;   // Switch 4 for delay time decrease
const int relayPin = D5;         // Relay output

// Variables for button states
bool isRunning = false;
unsigned long delayTime = 1000; // Default delay time in milliseconds
unsigned long previousMillis = 0;

// Variables to handle button debouncing
unsigned long lastDebounceTimeStart = 0;
unsigned long lastDebounceTimeStop = 0;
unsigned long lastDebounceTimeDelay = 0;
unsigned long lastDebounceTimeDelayDown = 0;
const unsigned long debounceDelay = 50; // milliseconds

// Variables for buttons state
int lastStartButtonState = HIGH;
int lastStopButtonState = HIGH;
int lastDelayButtonState = HIGH;
int lastDelayDownButtonState = HIGH;

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

  // Initialize display
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.println("System Initializing");
  display.display();

  // Initialize pins
  pinMode(buttonStartPin, INPUT_PULLUP);
  pinMode(buttonStopPin, INPUT_PULLUP);
  pinMode(buttonDelayPin, INPUT_PULLUP);
  pinMode(switchDelayPin, INPUT_PULLUP);
  pinMode(relayPin, OUTPUT);

  // Initialize relay state to off
  digitalWrite(relayPin, LOW);

  // Show initial message
  display.clearDisplay();
  display.setCursor(0,0);
  display.println("Ready");
  display.display();
}

void loop() {
  unsigned long currentMillis = millis();

  // Read buttons with debounce
  handleButtonStart(currentMillis);
  handleButtonStop(currentMillis);
  handleDelayAdjustment(currentMillis);

  // If start button pressed, start operation
  if (isRunning) {
    // Turn relay on
    digitalWrite(relayPin, HIGH);

    // Perform delay with non-blocking approach
    if (currentMillis - previousMillis >= delayTime) {
      previousMillis = currentMillis;
      // Toggle relay or perform other actions if needed
      // For continuous on/off, implement toggle here
    }
  } else {
    // Turn relay off
    digitalWrite(relayPin, LOW);
  }

  // Update display periodically
  static unsigned long lastDisplayUpdate = 0;
  if (currentMillis - lastDisplayUpdate > 500) { // update every 500ms
    lastDisplayUpdate = currentMillis;
    updateDisplay();
  }
}

// Handle start button
void handleButtonStart(unsigned long currentMillis) {
  int reading = digitalRead(buttonStartPin);
  if (reading != lastStartButtonState) {
    lastDebounceTimeStart = currentMillis;
  }
  if ((currentMillis - lastDebounceTimeStart) > debounceDelay) {
    if (reading == LOW && lastStartButtonState == HIGH) {
      // Button pressed
      isRunning = true;
    }
  }
  lastStartButtonState = reading;
}

// Handle stop button
void handleButtonStop(unsigned long currentMillis) {
  int reading = digitalRead(buttonStopPin);
  if (reading != lastStopButtonState) {
    lastDebounceTimeStop = currentMillis;
  }
  if ((currentMillis - lastDebounceTimeStop) > debounceDelay) {
    if (reading == LOW && lastStopButtonState == HIGH) {
      // Button pressed
      isRunning = false;
    }
  }
  lastStopButtonState = reading;
}

// Handle delay adjustment
void handleDelayAdjustment(unsigned long currentMillis) {
  int delayButtonState = digitalRead(buttonDelayPin);
  int delayDownState = digitalRead(switchDelayPin);

  // Increase delay time
  if (delayButtonState != lastDelayButtonState) {
    lastDebounceTimeDelay = currentMillis;
  }
  if ((currentMillis - lastDebounceTimeDelay) > debounceDelay) {
    if (delayButtonState == LOW && lastDelayButtonState == HIGH) {
      delayTime += 100; // increase delay by 100ms
    }
  }
  lastDelayButtonState = delayButtonState;

  // Decrease delay time
  if (delayDownState != lastDelayDownButtonState) {
    lastDebounceTimeDelayDown = currentMillis;
  }
  if ((currentMillis - lastDebounceTimeDelayDown) > debounceDelay) {
    if (switchDelayPin == LOW && lastDelayDownButtonState == HIGH) {
      if (delayTime > 100) {
        delayTime -= 100; // decrease delay by 100ms
      }
    }
  }
  lastDelayDownButtonState = delayDownState;
}

// Update OLED display
void updateDisplay() {
  display.clearDisplay();
  display.setCursor(0,0);
  display.print("Start: ");
  display.println(isRunning ? "Yes" : "No");
  display.print("Delay: ");
  display.print(delayTime);
  display.println(" ms");
  display.display();
}