⚡ Introduction

Electricity bills are increasing rapidly. Most users do not know:

• Real-time power consumption
• Appliance load impact
• Estimated bill before month-end
• Overload risk

Traditional meters only show total units consumed.

To solve this, we developed:

🔥 Smart Electricity Bill Saver & Real-Time Power Monitor

An IoT-based energy monitoring system that tracks real-time voltage, current, power, energy (kWh), and calculates estimated electricity bill instantly.

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🔥 Problem Statement

❌ No real-time monitoring
❌ Unexpected high bills
❌ No overload alert
❌ No energy analytics

Energy waste continues silently.

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💡 Solution Overview

✔ Real-time Voltage Monitoring
✔ Real-time Current Monitoring
✔ Power (Watt) Calculation
✔ Energy (kWh) Tracking
✔ Live Bill Estimation
✔ Overload Protection
✔ MQTT Cloud Monitoring
✔ Optional Relay Load Cut

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🧰 Required Hardware

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1️⃣ ESP32 Development Board

Role:

• WiFi communication
• Data processing
• IoT connectivity

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2️⃣ PZEM-004T v3.0 Energy Monitor

Role:

• Voltage measurement
• Current measurement
• Power calculation
• Energy tracking

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3️⃣ 5V SMPS Power Supply

Provides stable power to ESP32.

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4️⃣ Optional Relay Module

Used for overload-based automatic power cut.

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🔌 Circuit Diagram

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🔗 Complete Wiring Details

ESP32 ↔ PZEM

ESP32 Pin	PZEM Pin
GPIO17	RX
GPIO16	TX
5V	VCC
GND	GND

CT Coil

Install on AC phase wire only.

Optional Relay

GPIO4 → IN
5V → VCC
GND → GND

⚠ Follow proper AC safety precautions.

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🧠 Software Used

• Arduino IDE
• MQTT Broker (HiveMQ / Mosquitto)
• ESP32 Core
• PZEM004Tv30 Library
• PubSubClient Library

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💻 Complete ESP32 Code

#include <WiFi.h>
#include <PubSubClient.h>
#include <PZEM004Tv30.h>

const char* ssid = "YOUR_WIFI_NAME";
const char* password = "YOUR_WIFI_PASSWORD";

const char* mqtt_server = "broker.hivemq.com";

#define RELAY_PIN 4
#define PZEM_RX 16
#define PZEM_TX 17

float overloadCurrent = 10.0;
float electricityRate = 6.0;

WiFiClient espClient;
PubSubClient client(espClient);
HardwareSerial pzemSerial(2);
PZEM004Tv30 pzem(pzemSerial, PZEM_RX, PZEM_TX);

void setup_wifi() {
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
}

void reconnect() {
  while (!client.connected()) {
    client.connect("PowerMonitorClient");
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
}

void loop() {
  if (!client.connected()) reconnect();
  client.loop();

  float voltage = pzem.voltage();
  float current = pzem.current();
  float power = pzem.power();
  float energy = pzem.energy();

  float bill = energy * electricityRate;

  Serial.print("Voltage: "); Serial.println(voltage);
  Serial.print("Current: "); Serial.println(current);
  Serial.print("Power: "); Serial.println(power);
  Serial.print("Energy: "); Serial.println(energy);
  Serial.print("Estimated Bill: "); Serial.println(bill);

  if(current > overloadCurrent){
    digitalWrite(RELAY_PIN, HIGH);
    Serial.println("Overload Detected - Power Cut");
  }

  delay(3000);
}

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⚙️ Working Logic

1. Read Voltage
2. Read Current
3. Calculate Power
4. Read Energy (kWh)
5. Calculate Estimated Bill
6. Detect Overload
7. Publish to MQTT

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🏠 Applications

• Homes
• Shops
• Offices
• Solar systems
• Energy audit projects

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💼 Business Opportunity

✔ Smart home product
✔ IoT commercial device
✔ Energy audit service
✔ Rental property monitoring

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📞 Project Support

For complete source code, dashboard, PCB, ready device:

📲 WhatsApp: +91 7052722734

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🏁 Conclusion

This system helps:

✔ Reduce electricity bills
✔ Monitor real-time usage
✔ Prevent overload
✔ Improve energy efficiency

A scalable IoT-based energy management solution by Yarana IoT Guru.

📞 Contact YaranaIoT Guru Empowering IoT Innovation | ESP32 | Home Automation | Smart Solutions | 50K+ Community

We’d love to hear from you! Whether it’s IoT project queries, collaborations, tech support, custom PCB design, bulk orders, corporate training, college workshops, or freelance development — we’re just one message away.

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✉️ Email (Official)

For detailed inquiries, project support, business collaboration, sponsorships, or documentation: 📩 contact@yaranaiotguru.in 📧 Alternate: support@yaranaiotguru.in ⏳ Response: Within 24 hours (Mon–Sat) 💡 Best for attachments (code, schematics, logs, etc.)

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🌟 Community Platforms

Platform	Link	Purpose
Telegram Channel	t.me/YaranaIoTGuru	Project files, PDFs, updates
Telegram Group	t.me/YaranaIoTCommunity	Peer support, doubts
Discord Server	discord.gg/yarana-iot	Live voice help, coding rooms
WhatsApp Community	Join Here	Announcements & polls

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🏢 Office & Studio Address

Yarana Studio & Software (Yarana IoT Guru HQ) 📍 Near Rookh Baba Mandir, Umariya Badal Urf Gainda, Allahabad (Prayagraj), Uttar Pradesh – 212507, India ⭐ Google Rating: 5.0 ★ (100+ Reviews)

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🌐 Associated Website: yaranawebtech.i