# Logic block in Advanced Flow: mathematic calculation of Variable/Tag values **URL:** \ **Category:** Ideas & Suggestions\ **Tags:** featurerequest, homey-pro, advancedflow\ **Created:** [December 4, 2023, 11:22am UTC](https://community.homey.app/t/logic-block-in-advanced-flow-mathematic-calculation-of-variable-tag-values/96762 "2023-12-04T11:22:53Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![And](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/and/32/131408_2.png) [@And](https://community.homey.app/u/And)\ **Post date:** [December 4, 2023, 11:22am UTC](https://community.homey.app/t/logic-block-in-advanced-flow-mathematic-calculation-of-variable-tag-values/96762/1 "2023-12-04T11:22:53Z")
Hello @homey, I have a feature request. User Voice: As a Advanced Flow user I want to increase/decrease a given thermostat temperature by a certain value to increase/decrease a thermostat temperature. User Voice for the logic block: As a Advances Flow user I want to increase/decrease a given Variable/Tag value by a defined Variable/Tag/value to use the new value in a following building block. Idea: A logic block, which adds or substrates a given value from a Tag/value and provides it a a new Tag in the flow. What should be customisable in the logic block: Tag/value with the existing value & add/substract & the value to add/substract as a value/Tag/variable. Possible wording on the Logic block: Read (Variable/Tag) and (add/substract) (Variable/Tag/Value). What do I want to use it for: - Wen a hue switch button is pressed - Read the currently set temperature of the thermostat Eurotoronic Sprite Z-Wave (20.5 degree) - increase it by 0.5 degree. - send the new value to the thermostat as new temperature (21 degree) by using the block “set the temperature (value)” p.s. I m aware of the calculation logic block. But I am struggling to get the thermostat value into it. And I am forced to define a “text” (= Tag) where the new value should be written to. ---
**Author:** ![DirkH](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/dirkh/32/78952_2.png) [@DirkH](https://community.homey.app/u/DirkH)\ **Post date:** [December 4, 2023, 12:42pm UTC](https://community.homey.app/t/logic-block-in-advanced-flow-mathematic-calculation-of-variable-tag-values/96762/2 "2023-12-04T12:42:00Z")
Hi @And , I am not sure, if I understand what you want. Probably you cannot add something to a device property. But if you have a variable, you can add/substract/multiply/divide and store the result in the same variable. ![TestFormula](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/2/c/2c3f6323e86b0d4bba77886fb8a9e31a02231362.jpeg) If that is not sufficient you may use temporary variables, which are forgotten after the flow. [https://community.homey.app/t/app-pro-temporary-variables/67482](https://community.homey.app/t/app-pro-temporary-variables/67482) ---
**Author:** ![And](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/and/32/131408_2.png) [@And](https://community.homey.app/u/And)\ **Post date:** [December 4, 2023, 4:18pm UTC](https://community.homey.app/t/logic-block-in-advanced-flow-mathematic-calculation-of-variable-tag-values/96762/3 "2023-12-04T16:18:45Z")
Hi @DirkH, thank you for the tip I will try out the App Temporary-variable. Looks like a good workaround to avoid too much Variable. Currently my flow looks like this: ![Screenshot 2023-12-04 at 17.15.52](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/8/8/88fa55471fb08a8434050b05834becd4a8861ef6.png) ---
**Author:** ![And](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/and/32/131408_2.png) [@And](https://community.homey.app/u/And)\ **Post date:** [December 4, 2023, 4:30pm UTC](https://community.homey.app/t/logic-block-in-advanced-flow-mathematic-calculation-of-variable-tag-values/96762/4 "2023-12-04T16:30:08Z")
My solution with Temporary variable, which works: ![Screenshot 2023-12-04 at 17.28.12](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/7/3/7363cc9124fa6211526923659cff17fe67d90faa.jpeg)