WDT | Watchdog Timer | Watchdog Timer working | Watchdog Operation

A watchdog timer (WDT) is a hardware or software timer that monitors a system (like a microcontroller) to ensure its program is running correctly; if the software freezes or malfunctions and fails to periodically "reset" or "kick the dog," the WDT times out and triggers a system reset, preventing indefinite hangs and enabling self-recovery in embedded or remote devices. It acts like an automatic "turn it off and on again" for unresponsive systems, crucial for reliability in unattended equipment.

How it works
Counter: A WDT uses an internal counter, often counting down from a set value.
"Feeding the dog": The main software loop is designed to periodically reset this counter (e.g., by writing a specific value) before it reaches zero, indicating normal operation.
Timeout: If the software hangs and fails to reset the counter within the set time, the WDT overflows and triggers a hardware reset or an interrupt, restarting the system.

You’ll learn:
✅ What is a Watchdog Timer and how it works
✅ The internal operation and timing mechanism behind WDT
✅ How the Watchdog Timer resets the system during program failure
✅ Real-world examples of WDT usage in embedded systems and IoT devices
✅ Why the WDT is critical for system reliability and fault tolerance

By the end of this video, you’ll clearly understand how the Watchdog Timer prevents system crashes and ensures stable, fail-safe operation in microcontroller-based systems.

Chapters:-
00:00 Introduction
00:30 what is watchdog timer
01:30 what is the need of Watchdog timer
04:47 How watchdog timer works
08:04 How watchdog timer Resets Microcontroller
09:30 Advantages of watchdog timer

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