Hi, I’m using Seeeduino v2.21(328P) with Music Shield and made it do what I need when powered by USB. Now it’s time to make it run off the battery. I’ve just tried connecting 4.5V battery pack without much success. Arduino board seems working, but SD card initialization is much slower, and then it gets stuck completely at reading the card.
What’s curious is that I scanned the Seeedstudio store for batteries and found about four of these, but all of them supply 3.3V at different amperage. That’s a bit confusing, because Arduino won’t even start at 3V for me.
Any suggestions / answers?