ESP32 Watchdog Timer Causes Random Resets

In this tutorial, you'll learn about ESP32 Watchdog Timer Causes Random Resets. We cover key concepts, practical examples, and best practices.

The Problem

ESP32 resets randomly due to the Interrupt Watchdog Timer (IWDT) or Task Watchdog Timer (TWDT).

Quick Fix

Wrong

// Default watchdog enabled. Long operations trigger reset.

ESP32 resets during long Serial.print() or network operations.

Right

void setup() {
  disableCore0WDT();  // Disable WDT on core 0
  disableCore1WDT();  // Disable WDT on core 1
  // OR feed the WDT during long operations:
  for (int i = 0; i < 1000000; i++) {
    feedWatchdog();
    // do work
  }
}

No more random resets. Long operations complete successfully.

Prevention

Feed watchdog during long loops. Use esp_task_wdt_reset() to feed TWDT. Disable ISR watchdog for debug builds. Set longer timeouts for slow operations. Handle WDT in FreeRTOS idle hook.

DodaTech engineers apply these same patterns across Doda Browser, DodaZIP, and Durga Antivirus Pro for production IoT reliability.

FAQ