AVRs are still pretty popular, and I think that predates the Arduino frenzy (starting about 2005). If you disassemble a bunch of devices in your house, you migh

AVRs are still pretty popular, and I think that predates the Arduino frenzy (starting about 2005). If you disassemble a bunch of devices in your house, you might find a few of these. E.g. when I went to replace a faulty switch on my Logitech Perfomance MX mouse, I found an ATMEGA324PA. Debug pins seem to be exposed as well: https://steelcityelectronics.files.wordpress.com/2015/05/img_3821-e1431606516130.jpg https://steelcityelectronics.files.wordpress.com/2015/05/img... (not my site). But since I still use that mouse, I'd hesitate to flash the Arduino firmware on it ;-) Another ICs for shenanigans of this kind: In smaller, bluetooth-enabled devices I usually expect to find a nrf5x these days (and FCC docs often allows pre-purchase clarification). I think both nrf51 and nrf52 are supported by Arduino and ZephyrOS. Bonus points, though I not yet tried that: Their firmware dumping protection seems to be faulty (though the nrf52 requires power fault injection), so reverting/modding could also be an option.