Embedded Assignment

Problem Statement- ESP32-Based Smart Room Power Controller

Design and build an ESP32-based control unit capable of managing:

• 1 AC fan with speed control

• 3 independently controlled lights

• 4 independently controlled tube lights

The system should be controllable through a structured communication interface such as UART, BLE, Wi-Fi, or another justified method.

What we want to evaluate

We are not only checking whether the system works.
We want to understand how you think as an embedded engineer.

Your submission should demonstrate:

• hardware architecture thinking

• firmware architecture and code structure

• safe AC interfacing approach

• fan speed control reasoning

• fault handling

• production-readiness mindset

• debugging maturity

• ability to scale beyond a prototype

Mandatory Requirements

Functional

• Fan ON/OFF

• Fan speed control with at least 4 levels

• Independent ON/OFF control of 3 lights

• Independent ON/OFF control of 4 tube lights

• Status reporting

• Invalid command handling

• Non-blocking firmware design

Architecture

Please explain:

• system architecture

• hardware architecture

• firmware architecture

• communication protocol

• safety considerations

• production migration plan

Production Thinking

Please include:

• prototype approach

• engineering prototype approach

• production version approach

• manufacturing and test strategy

• serviceability / future expansion plan

Deliverables

Please submit:

1. Source code

2. Block diagram and/or schematic

3. Documentation explaining architecture and design choices

4. Short demo video

5. Debug diary mentioning issues faced, root cause, and fixes

6. Note on how you would move the design to production

Important

During technical review, you will be asked to explain and modify your design live.
We value original engineering thinking much more than polished copied work.