Plus, I have no idea how to debug or trace the microcontroller execution, just trial, error, and patience. I didn’t know anything about interrupt vectors, maintaining registers, and how to deal with 8 bits of data transfer at a time – Java has spoiled me so much. To be honest, I failed in my first 23 attempts to hack the C firmware. The completed device looks like this prototype: Digispark with APA106 RGB LED, 330 ohm resistor, and small capacitor Software progress Here is an example distinction between the two at the same brightness. I tested both the APA106 and WS2811 LEDs and the APA106 LEDs were superior in brightness, step, and diffusion. Digispark disable the always-on power LED with a scalpel This is an in-circuit light and cannot be disabled with software, but a scalpel does the trick. The very first hack is to disable the red power light on the Digispark board. Tip: If the ATtiny85 chips are bricked, let’s use a high-voltage serial programmer (HVSP) to reset and rescue them.
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