Arduino Watch Dog 看門狗使用

How to use Arduino WatchDog

Step1. Include Library

#include <avr/wdt.h>

Step2. Enable it

wdt_enable (WDTO_1S);//Put this in setup

You can change the times .

The times list.

Threshold value	Constant name	Supported on
15 ms	WDTO_15MS	ATMega 8, 168, 328, 1280, 2560
30 ms	WDTO_30MS	ATMega 8, 168, 328, 1280, 2560
60 ms	WDTO_60MS	ATMega 8, 168, 328, 1280, 2560
120 ms	WDTO_120MS	ATMega 8, 168, 328, 1280, 2560
250 ms	WDTO_250MS	ATMega 8, 168, 328, 1280, 2560
500 ms	WDTO_500MS	ATMega 8, 168, 328, 1280, 2560
1 s	WDTO_1S	ATMega 8, 168, 328, 1280, 2560
2 s	WDTO_2S	ATMega 8, 168, 328, 1280, 2560
4 s	WDTO_4S	ATMega 168, 328, 1280, 2560
8 s	WDTO_8S	ATMega 168, 328, 1280, 2560

Step3. Rember reset it in the limit times.

Like this example.

#include <avr/wdt.h> void setup() { Serial.begin(9600); wdt_enable(WDTO_4S); Serial.println("restart"); } void loop() { Serial.println("First"); delay(1000); wdt_reset(); }

Step4. Upload and test it.