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Help with some functions with arduino and ds18b20. Ello every Answered

Hello folks, im having some troubles to control some rellays based on the temperature read of one ds18b20. The sensor stay under water, and when the water temperature is higher than 44°C the rellay turns off, but the rellay must be off until the water temperature fall to 38°C. I have no ideia of how to code it, some one can help me?

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