Great for learning how to develop for the Pico with loads of example code to get you going. Word of caution, the Pimoroni default constructor for the APA102 object runs the clock at 20Mhz! The resulting waveform is pretty ugly and unreliable, with many glitching LEDs. Luckily, you can override this default in the constructor. Setting to 2Mhz gives a perfect clock signal and will run hundreds of LEDs flawlessly. Add the 2000000 as an additional parameter when calling the object constructor: APA102 led_strip(N_LEDS, pio0, 0, plasma2040::DAT, plasma2040::CLK, 2000000); You can see the difference in the scope traces