Liquid sensor

good night i would like to add a liquid sensor to my project, when the water was low i would like to receive a notification in the app that i am without water. does anyone know how to do?

//in loop
if(little water)
Blynk.notify(F("Pour, please!"));

The notification widget must be in the app.

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Does the ‘F macro’ really work with Blynk.notify ??


I have verified this macro works.

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