# Viva questions for an ESP32 IoT project

> Common viva questions for an ESP32 Wi-Fi or IoT project with what a good answer must cover: protocols, power, security and reliability.

Canonical: https://roboticsengineering.in/free-library/viva-questions-esp32-iot-project/ | Published: 2026-11-03 | Updated: 2026-11-03

**For an ESP32 or IoT project, examiners ask how data moves, how reliable it is and how it is secured.** Answer from your own design.

## Hardware

- **Why the ESP32?** Built-in Wi-Fi and Bluetooth, enough pins and memory, low cost. State the limits too, such as 3.3 V logic.
- **Which pins did you use and why?** Avoid strapping and flash pins. See the [wiring checker](https://roboticsengineering.in/wiring-checker/) and [ESP32 pinout](https://roboticsengineering.in/esp32-pinout-for-robotics/).
- **How is it powered?** Supply, current peaks and brownout. See [ESP32 brownout](https://roboticsengineering.in/fix/esp32-brownout-detector-was-triggered/).

## Networking

- **Which protocol did you use and why?** HTTP, MQTT or WebSocket. See [MQTT on the ESP32](https://roboticsengineering.in/mqtt-esp32-robot-telemetry/).
- **What happens when Wi-Fi drops?** Describe reconnect handling. See [Wi-Fi keeps disconnecting](https://roboticsengineering.in/fix/esp32-wifi-keeps-disconnecting/).
- **How is your data secured?** Say what you used: passwords, TLS, access control. State the limits honestly.

## Reliability and testing

- **How did you test it?** Range, long runs and power cuts, with a log.
- **What was the worst failure?** Have one real example and the fix.
- **How would you scale it to many devices?** Naming, updates and monitoring.

## Related

[Free Library](https://roboticsengineering.in/free-library/), [Report template](https://roboticsengineering.in/free-library/robotics-project-report-template/), [Viva questions](https://roboticsengineering.in/free-library/viva-questions-for-robotics-projects/), [More viva questions](https://roboticsengineering.in/robotics-project-viva-questions/).

Last reviewed: November 2026. Free to copy and adapt for your own college work. Follow your department format first; its rules override this page.