Watchdog Timer
A watchdog timer is a hardware or software-based timer used in embedded systems and computing to detect and recover from system malfunctions or hangs. It works by requiring the system to periodically reset the timer; if the timer expires due to a failure to reset, it triggers a corrective action such as a system reboot or interrupt. This mechanism helps ensure system reliability and availability in critical applications.
Developers should learn and use watchdog timers when building embedded systems, IoT devices, or any application where system uptime and fault tolerance are critical, such as in automotive, industrial control, or medical devices. They are essential for handling unexpected software bugs, hardware failures, or environmental issues that could cause a system to freeze, providing an automated recovery mechanism without manual intervention.