TL;DR: The Trinket Pro 5V user guide says that it’s easy to hook up battery packs by connecting the positive to the BAT+ pin, but what do I do with the negative coming from the battery pack?
My apologies in advance, for any of you who know anything about electronics (which is all of you!), this is going to be probably the most boneheaded question you’ve ever seen.
But I’ve gone my whole life without knowing anything at all, but I grabbed a couple of Arduino-compatible devices (Adafruit Trinket Pro 5V and Mini Trinket 3.3V) to see what the deal is and why people are so crazy about them.
I managed to follow these instructions (http://www.instructables.com/id/Multiple-Blinking-LED-on-the-Arduino/?ALLSTEPS) to get three LEDs blinking and my first simple project worked right off the bat! I’m more impressed that I didn’t manage to destroy anything (also my first time soldering anything).
But now I want to figure out how to power this thing with a battery pack instead of via USB. Basically, here’s my project idea: my 3 year old wants a robot costume at comic con, so I’ve figured out how to get three flashing LEDs on a breadboard - but only powered via USB - so this robot will have some flashing lights, and I’ve figured out separately how to hook up a 9V battery pack to a 12V CPU fan (to keep the helmet cool). Not bad for a newbie!
My only problem at this point is I don’t know how to hook up a battery pack to the Trinket Pro to have it work on the go. As far as I understand, there should be no problem powering the 5V Pro with a 9V battery. (I can get a new battery pack if there’s a better option)
The Trinket Pro 5V user guide says that it’s easy to hook up battery packs by connecting the positive to the BAT+ pin, but what do I do with the negative coming from the battery pack?
I’ve attached a photo of my breadboard with Trinket Pro attached.