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IOT Based Water Level Indicator Project Using Esp32 And Ultrasonic Sensor

 



Water Level Indicator Project Using ESP32

 

Water Level Indicator with Alarm on Tank Full. IoT Wi-Fi smart water level indicator for tanks with mobile app control.


📟 OLED Display (0.96" I2C SSD1306)

 

OLED Pin        ESP32 Pin

VCC                   3.3V

GND                   GND

SDA                  GPIO 21

SCL                    GPIO 22

 


 

🔔 BUZZER

 

Buzzer Pin       ESP32 Pin

 

+          GPIO 26

-           GND

 

 

 

 

Each LED connects to an ESP32 GPIO pin via a current-limiting resistor.

 


 

📋 Parts Required:

 

3 × LEDs (Red, Yellow, Green)

 

3 × 220Ω resistors

 

Jumper wires

 

 


🧠 ESP32 to LED Connections:

 

LED     Color   Connect ESP32 Pin    Series Resistor            Connect To

 

LOW    Red     GPIO 15          220Ω   GND

MID     Yellow GPIO 4            220Ω   GND

HIGH   Green  GPIO 2            220Ω   GND

 

 


 

🔧 How to Connect Physically:

 

For each LED:

 

1. Long leg (anode +) → Connect to a GPIO pin via a 220Ω resistor

 

 

2. Short leg (cathode -) → Connect directly to GND

 

 

 

➡️ Full Code

 

// Full ESP32 Water Level Indicator Code

// Features: OLED Display, 3 LEDs, Buzzer, Web Server for Mobile View (ESP32-compatible tone handling)

 

#include <WiFi.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

#include <WebServer.h>

 

#define SCREEN_WIDTH 128

#define SCREEN_HEIGHT 64

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

 

// Probe sensor input pins

#define LOW_PIN 33

#define MID_PIN 32

#define HIGH_PIN 25

 

// LED output pins

#define LED_LOW 15

#define LED_MID 4

#define LED_HIGH 2

 

// Buzzer pin

#define BUZZER_PIN 26

#define BUZZER_CHANNEL 0

 

// WiFi credentials

const char* ssid = "YOUR_WIFI_SSID";

const char* password = "YOUR_WIFI_PASSWORD";

 

 

WebServer server(80);

String waterLevelStatus = "Unknown";

 

void setup() {

  Serial.begin(115200);

 

  // Pin modes

  pinMode(LOW_PIN, INPUT_PULLUP);

  pinMode(MID_PIN, INPUT_PULLUP);

  pinMode(HIGH_PIN, INPUT_PULLUP);

 

  pinMode(LED_LOW, OUTPUT);

  pinMode(LED_MID, OUTPUT);

  pinMode(LED_HIGH, OUTPUT);

 

  // Buzzer PWM setup

  //ledcSetup(BUZZER_CHANNEL, 1000, 8);

  //ledcAttachPin(BUZZER_PIN, BUZZER_CHANNEL);

  // Buzzer setup using tone()

  pinMode(BUZZER_PIN, OUTPUT);

 

  // OLED setup

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {

    Serial.println("SSD1306 allocation failed");

    while (true);

  }

  display.clearDisplay();

  display.setTextColor(WHITE);

 

  // Connect to Wi-Fi

  WiFi.begin(ssid, password);

  display.setCursor(0, 0);

  display.setTextSize(1);

  display.println("Connecting to WiFi...");

  display.display();

 

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

 

  Serial.println("WiFi connected");

  display.clearDisplay();

  display.setCursor(0, 0);

  display.println("WiFi Connected!");

  display.println(WiFi.localIP().toString().c_str());

  display.display();

  delay(2000);

 

  // Web server endpoint

  server.on("/", []() {

    String html = "<html><head><meta http-equiv='refresh' content='3'></head><body><h2>Water Level: " + waterLevelStatus + "</h2></body></html>";

    server.send(200, "text/html", html);

  });

  server.begin();

}

 

void loop() {

  server.handleClient();

 

  bool low = digitalRead(LOW_PIN) == LOW;

  bool mid = digitalRead(MID_PIN) == LOW;

  bool high = digitalRead(HIGH_PIN) == LOW;

 

  // Determine level status

  display.clearDisplay();

  display.setCursor(0, 0);

  display.setTextSize(1);

  display.println("Water Level:");

 

  if (high) {

    waterLevelStatus = "FULL";

    display.setTextSize(2);

    display.setCursor(0, 20);

    display.println("FULL");

    digitalWrite(LED_HIGH, HIGH);

    digitalWrite(LED_MID, LOW);

    digitalWrite(LED_LOW, LOW);

    //ledcWriteTone(BUZZER_CHANNEL, 1500);

    //delay(200);

    //ledcWriteTone(BUZZER_CHANNEL, 0);

    tone(BUZZER_PIN, 1500);

delay(200);

noTone(BUZZER_PIN);

  } else if (mid) {

    waterLevelStatus = "MEDIUM";

    display.setTextSize(2);

    display.setCursor(0, 20);

    display.println("MEDIUM");

    digitalWrite(LED_HIGH, LOW);

    digitalWrite(LED_MID, HIGH);

    digitalWrite(LED_LOW, LOW);

    //ledcWriteTone(BUZZER_CHANNEL, 0);

    noTone(BUZZER_PIN);

  } else if (low) {

    waterLevelStatus = "LOW";

    display.setTextSize(2);

    display.setCursor(0, 20);

    display.println("LOW");

    digitalWrite(LED_HIGH, LOW);

    digitalWrite(LED_MID, LOW);

    digitalWrite(LED_LOW, HIGH);

    //ledcWriteTone(BUZZER_CHANNEL, 1000);

    //delay(500);

    //ledcWriteTone(BUZZER_CHANNEL, 0);

    tone(BUZZER_PIN, 1000);

delay(500);

noTone(BUZZER_PIN);

  } else {

    waterLevelStatus = "EMPTY";

    display.setTextSize(2);

    display.setCursor(0, 20);

    display.println("EMPTY");

    digitalWrite(LED_HIGH, LOW);

    digitalWrite(LED_MID, LOW);

    digitalWrite(LED_LOW, LOW);

    //ledcWriteTone(BUZZER_CHANNEL, 800);

    //delay(800);

    //ledcWriteTone(BUZZER_CHANNEL, 0);

    tone(BUZZER_PIN, 800);

delay(800);

noTone(BUZZER_PIN);

  }

 

  display.display();

  delay(1000);

}


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