washing-machine-notify/esp32_MachineNotify.ino

#include <WiFi.h>
#include <HTTPClient.h>
#include <Wire.h>
#include <BH1750.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// WiFi credentials
const char* WIFI_SSID = "YOUR_WIFI_SSID";
const char* WIFI_PASSWORD = "YOUR_WIFI_PASSWORD";

// ntfy.sh topic
const char* NTFY_TOPIC = "YOUR_NTFY_TOPIC";

// Pin definitions
const int VIBRATION_PIN = 4;

// OLED display settings
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Light sensor
BH1750 lightMeter;

// Thresholds
const float LIGHT_ACTIVATION_THRESHOLD = 200.0;
const float LIGHT_DEACTIVATION_THRESHOLD = 10.0;
const unsigned long VIBRATION_STATE_CHANGE_INTERVAL = 5000; // 5 seconds

// Device state
bool isVibrationActive = false;
bool isLightActive = false;
bool isDeviceActive = false;

// Time tracking for sensor states
unsigned long vibrationLowStartTime = 0;
unsigned long vibrationHighStartTime = 0;
unsigned long lightHighStartTime = 0;
unsigned long lightLowStartTime = 0;

// OLED display data
String displayData[4];
int currentDisplayLine = 0;
unsigned long lastDisplayScrollTime = 0;
const unsigned long DISPLAY_SCROLL_INTERVAL = 2000; // 2 seconds

void setup() {
  Serial.begin(115200);

  // Initialize vibration sensor pin
  pinMode(VIBRATION_PIN, INPUT);

  // Initialize I2C bus
  Wire.begin();

  // Initialize light sensor
  if (!lightMeter.begin(BH1750::CONTINUOUS_HIGH_RES_MODE)) {
    Serial.println(F("Could not find a valid BH1750 sensor, check wiring!"));
    while (1) { }
  }

  // Initialize OLED display
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.println(F("Initializing..."));
  display.display();

  // Connect to WiFi
  Serial.print("Connecting to ");
  Serial.println(WIFI_SSID);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  display.clearDisplay();
  display.setCursor(0,0);
  display.println("WiFi Connected");
  display.display();
  delay(1000);

  lastVibrationChangeTime = millis();
  lastLightChangeTime = millis();
}

void sendNotification(String message);
void updateDisplay();

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

  // Sensor readings
  bool currentVibrationState = (digitalRead(VIBRATION_PIN) == LOW);
  float currentLightLevel = lightMeter.readLightLevel();

  // Vibration state change logic
  if (currentVibrationState && !isVibrationActive) { // Vibration is active (LOW)
    if (vibrationLowStartTime == 0) {
      vibrationLowStartTime = currentTime;
    }
    if (currentTime - vibrationLowStartTime >= VIBRATION_STATE_CHANGE_INTERVAL) {
      isVibrationActive = true;
    }
    vibrationHighStartTime = 0; // Reset high timer
  } else if (!currentVibrationState && isVibrationActive) { // Vibration is inactive (HIGH)
    if (vibrationHighStartTime == 0) {
      vibrationHighStartTime = currentTime;
    }
    if (currentTime - vibrationHighStartTime >= VIBRATION_STATE_CHANGE_INTERVAL) {
      isVibrationActive = false;
    }
    vibrationLowStartTime = 0; // Reset low timer
  } else if (currentVibrationState) {
      vibrationHighStartTime = 0;
  } else {
      vibrationLowStartTime = 0;
  }

  // Light state change logic
  if (currentLightLevel >= LIGHT_ACTIVATION_THRESHOLD && !isLightActive) {
    if (lightHighStartTime == 0) {
      lightHighStartTime = currentTime;
    }
    if (currentTime - lightHighStartTime >= VIBRATION_STATE_CHANGE_INTERVAL) {
      isLightActive = true;
    }
    lightLowStartTime = 0;
  } else if (currentLightLevel < LIGHT_DEACTIVATION_THRESHOLD && isLightActive) {
    if (lightLowStartTime == 0) {
      lightLowStartTime = currentTime;
    }
    if (currentTime - lightLowStartTime >= VIBRATION_STATE_CHANGE_INTERVAL) {
      isLightActive = false;
    }
    lightHighStartTime = 0;
  } else if(currentLightLevel >= LIGHT_ACTIVATION_THRESHOLD) {
    lightLowStartTime = 0;
  } else {
    lightHighStartTime = 0;
  }


  // Overall device state
  bool previousDeviceState = isDeviceActive;
  isDeviceActive = isVibrationActive || isLightActive;

  if (isDeviceActive != previousDeviceState) {
    if (isDeviceActive) {
      sendNotification("Washing machine cycle started.");
    } else {
      sendNotification("Washing machine cycle finished.");
    }
  }

  // Update display data
  displayData[0] = "Vibration: " + String(isVibrationActive ? "ON" : "OFF");
  displayData[1] = "Light: " + String(currentLightLevel) + " lx";
  displayData[2] = "Light Active: " + String(isLightActive ? "ON" : "OFF");
  displayData[3] = "Device: " + String(isDeviceActive ? "ACTIVE" : "INACTIVE");

  // Update display
  updateDisplay();
}

void sendNotification(String message) {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String url = "http://ntfy.sh/" + String(NTFY_TOPIC);
    http.begin(url);
    http.addHeader("Content-Type", "text/plain");

    int httpResponseCode = http.POST(message);

    if (httpResponseCode > 0) {
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);
    } else {
      Serial.print("Error on sending POST: ");
      Serial.println(httpResponseCode);
    }

    http.end();
  } else {
    Serial.println("WiFi Disconnected. Cannot send notification.");
  }
}

void updateDisplay() {
  unsigned long currentTime = millis();

  // Scroll logic
  if (currentTime - lastDisplayScrollTime > DISPLAY_SCROLL_INTERVAL) {
    lastDisplayScrollTime = currentTime;
    currentDisplayLine = (currentDisplayLine + 1) % 4;
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);

  for (int i = 0; i < 4; i++) {
    int lineIndex = (currentDisplayLine + i) % 4;
    display.println(displayData[lineIndex]);
  }

  display.display();
}