48cm, it is a typo, there is not in aliexpress, you will have to get it in a hardware store, about 48cm the measure is not important since it simply has to be longer than the maximum height of your bottles
Wemos D1 MINI is powered by 5V, internally it operates at 3.3V and has its own voltage regulator
Is irrelevant, since it is for a digital signal the cable can be any, preferably thin
Hy, could you explain about the BOM:
Thanks