Here is my DigiKey My-List https://www.digikey.in/en/mylists/list/562833K4I6

This project was built by integrating an ESP32-C6-DEVKITC microcontroller with voltage and current sensors, a relay module, and a custom power supply, all programmed via Arduino IDE to enable real-time monitoring and remote control of electricity usage; sensor data is sent to the phone by acting as a webserver, allowing users to track consumption, control appliances from anywhere, and receive instant alerts, resulting in a robust, user-friendly IoT energy management prototype that is safe, accurate, and scalable for residential use.

1. Collecting the Required Components

I first gathered all the hardware needed for the project:

• ESP32-C6-DEVKITC development board
• ACS712 current sensor
• ZMPT101B voltage sensor
• Small AC bulb/fan as load
• Jumper wires
• Breadboard
• Power supply

2. Understanding the Working Principle

Before building, I understood two important concepts:

1. ACS712 measures AC current by detecting the magnetic field around a conductor.
2. ZMPT101B measures AC voltage using an isolation transformer.

The ESP32 reads these sensor outputs using its ADC pins and calculates:

✔ Voltage (Vrms)
✔ Current (Irms)
✔ Power (P = V × I)
✔ Power Factor

3. Building the Hardware Connections

I connected the sensors to ESP32:

• ACS712 OUT → ESP32 GPIO 34
• ZMPT101B OUT → ESP32 GPIO 35
• Common Ground connected
• Load connected safely in series with ACS712 and in parallel with ZMPT101B module

I ensured proper insulation because AC mains is dangerous.

4. Calibrating Current Sensor (ACS712)

The ACS712 has noise and offset, so I performed:

• Zero calibration
• Offset correction
• Multiple sample averaging

This allowed stable current readings even when no load was connected.

5. Calibrating Voltage Sensor (ZMPT101B)

ZMPT101B requires tuning the onboard potentiometer.

I:

• Supplied AC input
• Monitored ADC values
• Adjusted the pot until a clean sine wave output was seen
• Applied EmonLib's voltage() calibration

6. Writing the ESP32 Code

I wrote the full program to:

1. Read current (ACS712)
2. Read voltage (ZMPT101B using EmonLib)
3. Calculate power and power factor
4. Display readings in Serial Monitor
5. Host a web server on ESP32 to show live energy usage

7. Building the Web Dashboard

I created a simple web page hosted by the ESP32 that shows:

• Live Voltage
• Live Current
• Power (W)
• Power Factor
• Energy Usage

The interface uses green & white theme for readability.

8. Testing With Different Loads

I tested:

• Small lamp
• Fan
• Mobile charger

and checked how voltage, current, and power change.

9. Final Assembly and enclosure

I mounted the ESP32 and sensors inside a plastic enclosure with proper insulation holes for wires.