Raspberry Pi powers a vintage typewriter as a Claude terminal—type prompts and watch it reply. Hardware hack: Arduino scans the typewriter's 8x8 key matrix and sends phantom keypresses to type replies ...

As more complex calculation and check inside ISR are introduced from v1.2.0, there is possibly some crash depending on use-case. You can modify to use larger HW_TIMER_INTERVAL_US, (from current 10uS), ...