Power supply is
The setup also has pots and switches on the analog inputs. It's all compact because it's mounted to a 3D printer handheld controller.
Edit: The power goes to the LEDs through a 22 AWG "bus" along the bottom of the prototype board.
When providing external power you need:
- MUST connect negative of power supply to GND of Arduino
- MUST NOT connect positive to 5V.
For example:
You can refer to more detailed example for LED in this: How to use external power source for Arduino
I'm now wondering if I have a problem with Arduino and the Adafruit MCUs. I connected a new one to my PC and they seem to have problems talking with my computer. I have to double tap the reset button to upload the Blink program and, using the same procedure, fail to upload a program that works on my Mega. I'll post more if I find anything new.
If you connect the +5 AND the computer at the same time the two power supplies will fight. If the Arduino is turned on FIRST it will attempt to power up the computer as well.
Avoid this issue by putting a switch in the USB cable that breaks the RED wire.
There is circuitry in the Arduino that is supposed to prevent this, but there are permutations of power sequencing that can cause backflow. Additionally, off brand components may have lesser tolerances and be more susceptible to power variations.
There are other linits on Arduino power that must be observed as well.
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