/************* Smart Water Level Monitoring System *************
Hardware: ESP32, HC-SR04 Ultrasonic Sensor, Blynk App
Features:
- Measure water level in tank
- Send percentage to Blynk App
- Show water level on Serial Monitor
- Automatically detect tank full or empty
- Motor control can be added easily
****************************************************************/
#define BLYNK_TEMPLATE_ID "Your_Template_ID"
#define BLYNK_TEMPLATE_NAME "Water Level Monitor"
#define BLYNK_AUTH_TOKEN "Your_Blynk_Auth_Token"
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
// Wi-Fi Credentials
char ssid[] = "Your_WiFi_Name";
char pass[] = "Your_WiFi_Password";
// Ultrasonic Sensor Pins
#define TRIG_PIN 5
#define ECHO_PIN 18
// Tank Dimensions (in cm)
const int TANK_DEPTH = 100; // Tank height in centimeters
long duration;
float distance, waterLevel, waterPercent;
BlynkTimer timer;
/***************** Function to Measure Water Level *****************/
void measureWaterLevel() {
// Send ultrasonic pulse
digitalWrite(TRIG_PIN, LOW);
delayMicroseconds(2);
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
// Read echo time
duration = pulseIn(ECHO_PIN, HIGH);
// Calculate Distance (cm)
distance = duration * 0.034 / 2;
// Calculate water level
waterLevel = TANK_DEPTH - distance;
// Calculate percentage
waterPercent = (waterLevel / TANK_DEPTH) * 100.0;
if (waterPercent < 0) waterPercent = 0;
if (waterPercent > 100) waterPercent = 100;
// Send data to Blynk
Blynk.virtualWrite(V0, waterPercent); // Water Level in %
Blynk.virtualWrite(V1, waterLevel); // Water Level in cm
// Print on Serial Monitor
Serial.print("Distance: ");
Serial.print(distance);
Serial.print(" cm | Water Level: ");
Serial.print(waterLevel);
Serial.print(" cm | Tank Filled: ");
Serial.print(waterPercent);
Serial.println(" %");
}
/***************** Setup Function *****************/
void setup() {
Serial.begin(115200);
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
// Connect to Blynk
Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
// Timer runs every 1 second
timer.setInterval(1000L, measureWaterLevel);
}
/***************** Main Loop *****************/
void loop() {
Blynk.run();
timer.run();
}
