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Comparing temperateure value with slider value

Hello guys. I have a project that shows temperature on my nextion display. I have to control this temperature value with a relay by setting a value for temperature. i am using 1 slider for setting a value. i can see my temperature value on my display and i can see my slider value on the display but i cant compare these two values 

so my main objective is comparing slider value with temperature and send command to relay to open/close relay. 

can you help me?  thank you very much

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Perhaps you can explain how this is a feature request made in a closed forum?

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