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.

Posted in Arduino Hacks, hardware Tagged arduino, Arduino Yun, cloud, openwrt, router, shield ← Hardware “Security” And A DMCA Takedown Notice Sniffing NRF24L01+ Traffic With Wireshark → ...

Watch this video on YouTube. “Motor voltage: 24 VDC, 38 VDC (E-type). In my case, I used 12VDC power supply to the motor because this voltage level is compatible with L293D Motor Arduino Shield.

Arduino devices have had the option of a GSM linkup for awhile, but getting that cellular link to truly strut its stuff hasn't always been easy, even for those of us who'd be inclined to program ...