ESP8266 Power Monitoring with AP Mode

Overview

This project is an ESP8266-based Power Monitoring System that reads voltage, current, power, energy, frequency, and power factor using the PZEM-004T-100A sensor. It runs as a standalone access point (AP Mode) and serves a web interface where real-time power data can be viewed.

Features

✅ Wi-Fi Access Point (AP Mode) – No need for an external router. The ESP8266 hosts its own Wi-Fi network. ✅ Real-time Power Monitoring – Displays voltage, current, power, energy, frequency, and power factor. ✅ Web Dashboard – Responsive HTML page with live updates using AJAX. ✅ Cost Calculation – Converts power consumption into a peso value (₱) based on energy usage. ✅ Relay Control – Supports turning SSR relays ON/OFF via Telegram commands. ✅ Copyright Footer – Includes "© 2025 Dave | ESP8266 Power Monitor" on the web interface.

Components Required

• ESP8266 (NodeMCU, Wemos D1 Mini, or similar)
• PZEM-004T-100A Power Meter Sensor
• Solid State Relays (SSR)
• SIM800L Module (Optional, for GSM-based control)
• Power Supply (5V for ESP8266, 12V for PZEM-004T)

Circuit Connection

ESP8266 Pin	PZEM-004T Pin
5V	VCC
GND	GND
RX (D7)	TX
TX (D6)	RX

Installation Guide

1️⃣ Flash the ESP8266

Upload the firmware using Arduino IDE or PlatformIO. Ensure you have the following libraries installed:

• ESP8266WiFi
• ESPAsyncWebServer
• ArduinoJson
• PZEM004Tv30
• EEPROM

2️⃣ Connect to ESP8266 Wi-Fi

• After flashing, the ESP8266 creates a Wi-Fi network called ESP8266_PowerMonitor.
• Connect to this network and open a browser.
• Visit http://192.168.4.1 to access the web dashboard.

Web Dashboard

• Live Power Data: Displays voltage, current, power, energy, frequency, power factor, and cost.
• Relay Control: Sends Telegram commands to control SSR relays.

API Endpoints

Method	Endpoint	Description
GET	/data	Returns power data
POST	/relay	Control SSR relays

Example API Response

{
  "voltage": 220.5,
  "current": 1.23,
  "power": 271.2,
  "energy": 10.5,
  "frequency": 60,
  "pf": 0.95,
  "cost": 50.25
}

Notes

• Default AP Mode IP: 192.168.4.1
• Modify the kWh cost rate in the code to match your local electricity rates.

License

📜 MIT License – Free to use and modify.

Author

👤 Dave – 2025 | ESP8266 Power Monitor