# Filter data in Graphs on Dashboard

**URL:** <https://discourse.nodered.org/t/filter-data-in-graphs-on-dashboard/36154>\
**Category:** Dashboard\
**Created:** [18 November 2020 16:56 UTC](https://discourse.nodered.org/t/filter-data-in-graphs-on-dashboard/36154 "2020-11-18T16:56:18Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![alanmasu](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/alanmasu/32/32206_2.png) [@alanmasu](https://discourse.nodered.org/u/alanmasu)\
**Post date:** [18 November 2020 16:56 UTC](https://discourse.nodered.org/t/filter-data-in-graphs-on-dashboard/36154/1 "2020-11-18T16:56:18Z")

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Hi,  
I built a thermometer by ESP32 and an NTC, I connect this to my WiFi network and thanks to MQTT and Raspberry Pi 4 I'm collecting measurements every 15 minutes.  
I would like to represent the temperature measurements in a line chart and I would like to have the ability to filter them for date and time.  
The second problem is: max and min value. The graph have the max and min properties but in this way them are static. I must always show the zero value, but if I set it as a minimum and the temperature drops below zero the graph does not show that value.

Someone have any ideas?

Thanks in advance

Alan Masutti

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [18 December 2020 16:56 UTC](https://discourse.nodered.org/t/filter-data-in-graphs-on-dashboard/36154/2 "2020-12-18T16:56:28Z")

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