# Retain value for 30s or more even if its changes

**URL:** https://community.factoryio.com/t/retain-value-for-30s-or-more-even-if-its-changes/2302
**Category:** Uncategorized
**Created:** [August 10, 2023, 7:49am UTC](https://community.factoryio.com/t/retain-value-for-30s-or-more-even-if-its-changes/2302 "2023-08-10T07:49:52Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![tofandenis18](https://avatars.discourse-cdn.com/v4/letter/t/258eb7/32.png) [@tofandenis18](https://community.factoryio.com/u/tofandenis18)
#### Post date: [August 10, 2023, 7:49am UTC](https://community.factoryio.com/t/retain-value-for-30s-or-more-even-if-its-changes/2302/1 "2023-08-10T07:49:52Z")

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I have an application with a vision sensor and some semi-finished products of different color. How do I retain the sensor value for a longer time? I have a shelf and a stacker craner that I use but I don’t know which function to use.