Capacitive soil moisture sensor v1.2

My first post so forgive etiquette errors…
I was researching on this forum about the capacitive soil sensor v1.2. I have not received the sensors yet, however, after reading the questions and replies. I reviewed the schematic and looked up the data sheet of the series regulator XC6206. The device seems to have several drop out values given the specific output voltage of 3 volts. I am wondering if this may be the core problem? Some seem to have better results using a 5v input since, especially if the dropout is really marginal. Someone suggested using a pot to check the code, a very good idea to make sure of no code errors!

Best and hope that helps?

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