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Current is consumed when an input pin switches from HIGH to LOW or from LOW to HIGH. An unconnected "floating" input pin can change randomly depending on the local environment (EMI, noise, etc). That is unpredictable. The "it will consume more" is erroneous - it should be "it could consume more". The could is important, as I ...


3

Just for clarity: your diagram shows the Arduino, the batteries, and the charger connected in parallel - which is correct for what you want to do. However, a 12v power supply (batteries, charger, or both) are at, or very close to the maximum input voltage spec the Uno. The Uno's voltage regulator has to waste - as heat - a good deal of power in reducing the ...


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Although, I don't understand where an increased power-consumption would come from when the INPUT pin is unconnected and no pull-up is active. This part of your question already has 2 answers, so I'll just answer the "power saving part". The data sheet says "If some pins are unused, it is recommended to ensure that these pins have a defined ...


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