Auto Reset in Arduino Uno

[andihong]

i have a problem with arduino that stop working with gsm shield, gsm shield not even sending datas after several hours.


is there any way to auto reset arduino every 60 minutes ? with code actually. thanks before.

 

[FenTrac]

The ATmega328 has a watchdog timer that can be used to reset or interrupt the processor. Refer to the ATmega328 user manual for instructions on how to use it. Basically, the program that is running continually restarts the watchdog timer before it times out. If the program fails to restart the watchdog timer in time, it times out and resets or interrupts the processor, depending on how it is configured.

 

[bigdogguru]

While FenTrac's recommendation for utilizing the device watchdog timer is certainly valid, if you find the system repeatedly suffers from such "lockups" then it would be prudent for you to determine what exactly is causing the issue and modify the code or hardware accordingly. Watchdog timers are intend as a last resort "fail-safe" when the unexpected occurs, they are not intend to routinely handle issues which occur with regularity.

As Arduino code can be difficult to debug, especially with issues which occur intermittently, you might consider implementing a trace stack in some form of nonvolatile storage, which is undated regularly with data which can help determine when and why these lockups occur.

BigDog