Over the years, we’ve seen some modern microcontrollers turn out to be 5V-tolerant – now, RP2040 joins the crowd. Half a year ago, when we covered an ISA card based on a Pi Pico, [Eben Upton ...

[Brett] had been intrigued by some of the attempts to bend hardware SPI to the will of the WS2811 — notably [Cunning_Fellow’s] work featured in this post. He took it a great step forward by ...

There are also WS2811 RGB LEDs for those times when you ... buttons and a couple of 18650 batteries via a IP3506 5V 2A charge / discharge controller making the unit portable.