Miniature IoT Water TDS & Level Monitor Cum Controller (Arduino / ESP8266 | IoT | Smart Water Management))

 Title:

👉 IoT Based Water TDS and Level Monitoring with Automatic Pump Controller

Objective:
To continuously monitor water quality (TDS) and water level, display values locally and on mobile/cloud, and automatically control a water pump based on level & quality thresholds.

Why this project matters:

• Ensures safe drinking water

• Prevents overflow & dry run

• Ideal for RO systems, tanks, smart homes, labs

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2️⃣ SYSTEM FEATURES

✅ Real-time TDS (ppm) monitoring
✅ Water level sensing (Low / Medium / High)
✅ Automatic motor ON/OFF
✅ IoT dashboard (Blynk / ThingSpeak)
✅ Mobile alerts
✅ Compact miniature working model

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3️⃣ BLOCK DIAGRAM 

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4️⃣ HARDWARE REQUIREMENTS

Component	Quantity
ESP8266 NodeMCU (recommended)	1
TDS Sensor Module	1
Water Level Sensor (or Float Switch)	1
Relay Module (5V)	1
Mini Water Pump	1
16x2 LCD (I2C)	1
Jumper Wires	As needed
5V Power Supply	1
Mini Tank / Bottle	1

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5️⃣ PIN CONNECTIONS (NodeMCU)

🔌 TDS Sensor

TDS Module	NodeMCU
AO	A0
VCC	3.3V
GND	GND

🔌 Water Level Sensor

Sensor	NodeMCU
Signal	D5
VCC	3.3V
GND	GND

🔌 Relay Module

Relay	NodeMCU
IN	D6
VCC	VIN
GND	GND

🔌 LCD (I2C)

LCD	NodeMCU
SDA	D2
SCL	D1

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6️⃣ WORKING LOGIC

• If Water Level LOW → Pump ON

• If Water Level HIGH → Pump OFF

• If TDS > Limit (e.g. 500 ppm) → Alert

• Data sent to IoT App

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7️⃣ ARDUINO / ESP8266 CODE (FULL)

#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <LiquidCrystal_I2C.h>

char auth[] = "Your_Blynk_Auth";
char ssid[] = "WiFi_Name";
char pass[] = "WiFi_Password";

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define TDS_PIN A0
#define LEVEL_PIN D5
#define RELAY_PIN D6

int tdsValue = 0;

void setup() {
  Serial.begin(9600);
  pinMode(LEVEL_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, HIGH);

  lcd.init();
  lcd.backlight();

  Blynk.begin(auth, ssid, pass);
}

void loop() {
  Blynk.run();

  int level = digitalRead(LEVEL_PIN);
  tdsValue = analogRead(TDS_PIN);
  int ppm = map(tdsValue, 0, 1023, 0, 1000);

  lcd.setCursor(0,0);
  lcd.print("TDS:");
  lcd.print(ppm);
  lcd.print(" ppm ");

  lcd.setCursor(0,1);
  if(level == LOW){
    lcd.print("Tank: LOW   ");
    digitalWrite(RELAY_PIN, LOW);
  } else {
    lcd.print("Tank: FULL  ");
    digitalWrite(RELAY_PIN, HIGH);
  }

  Blynk.virtualWrite(V0, ppm);
  Blynk.virtualWrite(V1, level);

  delay(1000);
}

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8️⃣ IoT MOBILE APP (BLYNK)

Widgets:

• Gauge → TDS Value (V0)

• LED → Water Level (V1)

• Button → Manual Pump Control (optional)

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