IoT Smart Energy Meter
Live measurement of voltage, current, power and energy for a demonstration load, with a phone dashboard.
- Suitable for
- Diploma
- Technology
- ESP32
Advanced8–10 days
IoT · Smart Home
IoT Home Automation
Appliance control from a phone over Wi-Fi, with physical switches that keep working and live status feedback.
- Difficulty
- Intermediate
- Typical time
- 6–8 days
- Suitable for
- Diploma
Price
Contact for price
Cost depends on components, complexity and which deliverables you need, so we quote after understanding your requirement.
Technologies
- ESP32
- Wi-Fi control
- MQTT / HTTP dashboard
- Relay switching
Project overview
Four load channels are controlled by relays driven from an ESP32, and each channel can also be operated by its own physical switch. The dual control matters: an automation project where the wall switch stops working is not an improvement, and examiners ask about exactly that.
State is synchronised in both directions, so toggling a physical switch updates the phone dashboard and vice versa. The controller keeps the last known state in non-volatile memory and restores it after a power cut rather than coming back with everything off.
For classroom demonstration the model drives lamps and a fan at low voltage on a mounted board. Where a mains-switching version is genuinely required, the high-voltage section is enclosed, fused and labelled — this is discussed and agreed before the build.
Features
- Four independently controlled channels
- Phone control over Wi-Fi with live status
- Physical switches remain functional and stay in sync
- Last state restored after a power interruption
- Mobile hotspot fallback so demonstrations do not depend on campus Wi-Fi
How it works
- 1The ESP32 connects to the configured Wi-Fi network and subscribes to the dashboard's control topics.
- 2A command from the phone sets the corresponding relay and publishes the new state back.
- 3A physical switch press is debounced, toggles the same relay and publishes the change so the dashboard follows.
- 4Every state change is written to non-volatile memory.
- 5On power-up the saved states are restored before the network connection is attempted.
Components used
- ESP32 development board
- 4-channel relay module with opto-isolation
- Manual switch bank
- Demonstration lamps and fan
- Status LEDs
- Regulated supply
Questions about this project
Does it switch real mains appliances?
The standard build is a low-voltage demonstration model, which is safe to carry and set up in a classroom. A mains version with a fully enclosed and fused high-voltage section is possible — discuss it before the build starts.
What happens if the Wi-Fi drops during the demo?
The physical switches keep working and the relays hold their state. The dashboard resynchronises when the connection returns.
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Need the IoT Home Automation in Surat?
Send your class or course and your submission date and we'll confirm what's achievable, what it includes and what it costs — before you commit.