# Chronograph calculate times **URL:** \ **Category:** Questions & Help\ **Created:** [June 27, 2024, 2:56pm UTC](https://community.homey.app/t/chronograph-calculate-times/112072 "2024-06-27T14:56:11Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![John\_Lesage](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/john_lesage/32/16576_2.png) [@John\_Lesage](https://community.homey.app/u/John_Lesage)\ **Post date:** [June 27, 2024, 2:56pm UTC](https://community.homey.app/t/chronograph-calculate-times/112072/1 "2024-06-27T14:56:11Z")
I have a smart plug that controls a Humidifier, I have made a flow to inform me when the smart plug has started 5 times. Now I also want to check the time the smart plug was on during these 5 times to check the waterreservoir. Eg. 1st **H** umidifier was on for 40 minutes, 2nd **H** was on for 2 hours, 3rd **H** was on for 1 hour, etc. I want to receive a message if the **H** is on for 3,5 hours ---
**Author:** ![Hielke\_de\_Jong](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/hielke_de_jong/32/79029_2.png) [@Hielke\_de\_Jong](https://community.homey.app/u/Hielke_de_Jong)\ **Post date:** [June 27, 2024, 9:01pm UTC](https://community.homey.app/t/chronograph-calculate-times/112072/2 "2024-06-27T21:01:27Z")
with [Chronograph App for Homey | Homey](https://homey.app/en-us/app/nl.fellownet.chronograph/Chronograph/) it is possible to use a stopwatch. ---
**Author:** ![Cuprum](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/cuprum/32/41409_2.png) [@Cuprum](https://community.homey.app/u/Cuprum)\ **Post date:** [June 28, 2024, 4:39am UTC](https://community.homey.app/t/chronograph-calculate-times/112072/3 "2024-06-28T04:39:52Z")
Actually there is no reason to calculate time in flows. We can measure it directly 😉 How to do it - to many possible paths and different timer apps, but main steps… - Use some Timer ( does not matter it counts back or forwards, but You must set event when it reaches back to zero or to the specified runed time for **H** ) - When **H** starts, start ( actually resume, do not set new value) the Timer - When **H** stops, pause ( again, not zero/set ) the Timer - When the timer reaches zero/determined value - send message - Use automatic ( together with “send message” ) or manual ( GUI / button / … ) re-setting The Timer Above are the bones of logic, if i need to build something. Just for comment - i personally prefer to have separate event handling for re-seting timer, because there may be “human factor delay” between message and tank refill. ---
**Author:** ![John\_Lesage](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/john_lesage/32/16576_2.png) [@John\_Lesage](https://community.homey.app/u/John_Lesage)\ **Post date:** [June 28, 2024, 10:00am UTC](https://community.homey.app/t/chronograph-calculate-times/112072/4 "2024-06-28T10:00:25Z")
Hi Hielke, Thanks, can you provide an example? Regards, John ---
**Author:** ![John\_Lesage](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/john_lesage/32/16576_2.png) [@John\_Lesage](https://community.homey.app/u/John_Lesage)\ **Post date:** [June 28, 2024, 10:01am UTC](https://community.homey.app/t/chronograph-calculate-times/112072/5 "2024-06-28T10:01:24Z")
:HI Cuprum, Same as above, can you please provide an example? Regards, John ---
**Author:** ![Cuprum](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/cuprum/32/41409_2.png) [@Cuprum](https://community.homey.app/u/Cuprum)\ **Post date:** [June 28, 2024, 10:37am UTC](https://community.homey.app/t/chronograph-calculate-times/112072/6 "2024-06-28T10:37:36Z")
Ok, some PoC, As here is quite hot, i used Fan instead. Also used some other handfull pieces. But hope, the change of devices is easy… also take it easy, used only ~10 minutes and not fully tested/debuged it 😇 ![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/c/a/ca16106561a556e7050ca274c690257a6387785c.png) ---
**Author:** ![Hielke\_de\_Jong](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/hielke_de_jong/32/79029_2.png) [@Hielke\_de\_Jong](https://community.homey.app/u/Hielke_de_Jong)\ **Post date:** [June 28, 2024, 2:27pm UTC](https://community.homey.app/t/chronograph-calculate-times/112072/7 "2024-06-28T14:27:20Z")
![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/b/a/ba15bd2b0c02ecc2bf9759396b4a17a4bf36454f.png) Witch extra check when you turn it on (but for reminder if stopwatch was not set to 0). ---
**Author:** ![John\_Lesage](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/john_lesage/32/16576_2.png) [@John\_Lesage](https://community.homey.app/u/John_Lesage)\ **Post date:** [June 28, 2024, 2:43pm UTC](https://community.homey.app/t/chronograph-calculate-times/112072/8 "2024-06-28T14:43:21Z")
thanks a lot I will try this tonight 😉