I’m working on an infinity mirror project that I found over on the FastLED feed. I was doing testing on an Arduino Uno, and right now I have it running on an Arduino pro mini and a digistump RTC kit, cobbled together on a generic PCB. Ultimately, for the final ‘product’, I’d like to use as little as I really need and put it on a custom PCB, which I’ve been working on. Before I can finalize the PCB, I need to determine what’s absolutely needed for the 328P to run properly and not give any trouble. I found a youtube video here That basically indicates that outside of the 328P chip, all that’s needed are two 22pF capacitors and the 16mHz crystal, and a 100nF capacitor in between the USB adapters DTR & pin 1 on the 328, which is only needed to allow the reset command from the USB > serial adapter to reset the chip for programming.
I then found another similar project that indicated that a 10k resistor is needed between pin 1 & +5vdc, and a 10uh inductor between +5 & pin 20, and a 100nF capacitor between +5vdc & pins 8 & 22. It also indicated that there should be 20pF capacitors in place of the 22pF capacitors indicated in the linked youtube video. If I were to search some more, I’d probably find about 10 other designs to run the 328P in a minimalist setup.
I’ve attached the relevant portion of my schematic. Does anyone know what is really needed for a 328P to run without issue (long term)?