# ATtiny85 Watchdog Timer with Millis Calculation

**URL:** <https://forum.arduino.cc/t/attiny85-watchdog-timer-with-millis-calculation/979010>\
**Category:** 3rd Party Boards\
**Created:** [April 9, 2022, 1:50am UTC](https://forum.arduino.cc/t/attiny85-watchdog-timer-with-millis-calculation/979010 "2022-04-09T01:50:39Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![mrburnette](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/mrburnette/32/702556_2.png) [@mrburnette](https://forum.arduino.cc/u/mrburnette)\
**Post date:** [April 9, 2022, 2:38pm UTC](https://forum.arduino.cc/t/attiny85-watchdog-timer-with-millis-calculation/979010/6 "2022-04-09T14:38:26Z")

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> [@sbibat2](#):
>
> I took the watchdog timer code from an example online,

> [@Interrupt, sleep ATtIny85, lot of questions](https://forum.arduino.cc/t/interrupt-sleep-attiny85-lot-of-questions/979112/8):
>
> Long ago, I wrote "Hot Yet" a t85 /thermistor project for the lavatory; the idea being that a green LED would indicate a water temperature in the range of comfortable while a red LED meant too hot and a blue LED meant cold water. No one likes to wash their hands in cold water and scalding hot is not "cool: (pun intended.) Code uses the Watchdog timer to periodically wake. Code made use of CodingBadly's core for t85 May need some work for current ArduinoIDE /\* M. Ray Burnette 20140210 Op…

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