Watchdog Timer
A watchdog timer is a hardware or software mechanism used in embedded systems and computing to detect and recover from system malfunctions or hangs. It works by requiring the system to periodically reset a timer; if the timer expires due to a failure to reset, it triggers a corrective action such as a system reboot or interrupt. This ensures reliability and fault tolerance in critical applications where continuous operation is essential.
Developers should learn and use watchdog timers when building embedded systems, IoT devices, or any application requiring high reliability and fault recovery, such as in automotive, industrial control, or medical devices. They are crucial for preventing system lock-ups due to software bugs, hardware faults, or environmental disturbances, ensuring that devices can automatically recover without manual intervention.