Microcontrollers existed before the Arduino, and a device that anyone could program and blink an LED ... circuit with just a microcontroller, an EEPROM, crystal, and brownout circuit.

[TheMagicSmoke] has produced just what we’d have needed then for one component that’s ubiquitous, the I 2 C EEPROM ... s a straightforward add-on for an Arduino Mega, so we’re shown the ...