Did you know that most AVR chips have a type of hardware exclusive OR (XOR) option when it comes to ... from an ATtiny13 datasheet) you’ll find a section on Toggling the Pin.

You can find further background on Seed XOR here. This guide starts with an initial set up section for new users. If you already have a Coldcard setup, then you can skip straight to “Step Seven: ...

XOR badge to be officially awesome ... Above the eyes you’ll find 16 Mbit of flash, a 128×64 OLED screen, and a reset button. The user inputs are five switches and the badge is powered by ...