You have to pull an extra wire from the sensor’s input voltage to your Arduino’s AREF pin, so you know what the actual voltage at the end of the cable is, so you can estimate the 10-90% range.

The small panel mount DC digital voltmeter’s red wire will be attached to the Arduino’s 5-V pin. Arduino’s ground will be wired to the small panel mount DC digital voltmeter’s black wire. Figure 2 ...

However, all the 60W power bank on the market are bulk and expensive. That is why I decided to make my own. While I was designing the power bank, I thought to myself, why can’t I make one with a ...