Cannot communicate between RPi and Arduino

No resolution on my end.

Any suggestions?

Zitat von penfold42

I'm pretty sure you need adalight as the led type, not adalightapa102

I'd also try changing the arduino sketch and Hyperion config to use 115200

Some good news! The Arduino and Pi now talk to each other. Here's what I had to do:

• Change device type from "adalightapa102" to "Adalight" in the Hyperion JSON config
• LED_TYPE in sketch remains unchanged: APA102
• Baudrate remains unchanged

After getting everything to communicate I had another problem. Depending where you look, the APA102-C LED color order is documented differently. With a little debugging I found the correct color order and updated my sketch

• Changed the color order on my sketch to BGR

With those problems solved I ran into an issue where the LEDs would flicker with fast moving effects:

I think I've reduced this by grounding the LED strip to the ground pin on the power side of the Arduino. I had previously grounded the LED strip on the other side.

My HDMI to RCA adapter doesn't appear to be pulling a signal from my HDMI splitter. I think I have a defective adapter...but it could be an issue with the HDMI splitter and HDCP. I have a replacement HDMI to RCA adapter on the way.

But, here's where I'm at today:

FINALLY! Turns out it was an issue with the HDMI + HDCP.