Yes, two AA batteries at 1.5v each would equal only 3 volts when connected in series. The Arduino needs 5v so [AI] decided to use a MAX756 DC-to-DC step-up regulator to maintain a steady stream of 5v.

The EnergyShield Arduino rechargeable battery has been created by Nightshade Electronics and has three main internal functions including a circuit to boost the battery’s nominal voltage of 3.7V ...

Battery Protection Mechanism: Battery Overcharge & Deep Discharge; Here’s the bottom view of the 18650 shield. As you can see, almost all key parts are soldered neatly on the bottom side of the ...

The 5.2V is safe for all 5V-powered electronics like Arduino, Raspberry Pi, or Beagle Bone while preventing icky brown-outs during high current draw because of USB cable resistance.

Options to power the Arduino Nano include USB, ... The 5V pin can come particularly handy in cases when you're using a 5V supply — from a Battery Eliminator Circuit (BEC) for instance.

Most of the batteries perform about the same from 1.5V down to about 1.2V, but below that, the results diverge wildly, ... Topics Arduino battery DIY Electronic Geek GeekDad. Read More.

The junction on the voltage divider network connected to the the Arduino analog pin is equivalent to the input voltage divided by 11, so 55V ÷ 11 = 5V. In other words, when measuring 55V, the Arduino ...

What do you do if even the smallest Arduino boards (or their clones) are too big for your homebrew project? If you're Johan Kanflo, you find a way to make them even smaller. His AAduino project ...