Use the auto reset feature of ATMEGA in case a long loop or problems in the sketch. Use LowPower library for sleep the ATMEGA (link: )Ģ. Any comments will be very usefull for me and for everybody What to do you think of this sketch that JOINS the extended watchdogtimer and LowPower library for sleep the board ? unless wdt_disable() in loop() is reached first set WDE (reset enable.4th from left), and set delay interval Wdt_reset() // start timer again (still in interrupt-only mode)Įlse // then change timer to reset-only mode with short (16 ms) fuse ISR(WDT_vect) // watchdog timer interrupt service routine wdt_reset() // this is not needed.timer starts without it
and set delay interval (right side of bar) to 8 seconds, WDTCSR = 0b01000000 | 0b100001 // set WDIE (interrupt enable.7th from left, on left side of bar) using bitwise OR assignment (leaves other bits unchanged). WDTCSR |= 0b00011000 // Set WDCE (5th from left) and WDE (4th from left) to enter config mode,
#8 SECONDS 8 MINUTE TIMER CODE#
code that normally takes less than xx sec to process While (true) // Whoops.in an infinite loop! For testing only.
WatchdogEnable() // set up watchdog timer in interrupt-only mode Serial.println("**** starting loop ****") // should see this approx every xx secs Volatile int countmax = 3 // Arbitrarily selected 3 for this example. Volatile int counter // Count number of times ISR is called. It seems to work for me! #include // for watchdog timer I would appreciate if anyone can find problems with this. This uses the watchdog timer's "interrupt-only" mode for a user-defined number of loops, and then changes to the "reset-only" mode. This new code allows me to wrap the entire process (essentially all of loop()) in one pair of timer enable/disable commands (as in the sketch below). That wasn't too bad, but it seemed messy and the timer probably expired a few times before it should have. Before I wrote the code below, I wrapped each cc3000 command in the wdt_enable(WDT0_8S)/wdt_reset() pair, and sometimes 8 seconds wasn't long enough. That board randomly hangs at nearly all of the dozen or so commands needed to connect to an access point and upload data.
I wrote this for a sketch that uses the Adafruit cc3000 wi-fi board. This topic was covered by Nick Gammon for sleeping/waking here:, but the code posted below is different - this is for "running" sketches that might occasionally hang. Here's a way I discovered to use the watchdog timer to get reset times arbitrarily longer than 8 seconds.
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