Source: https://mayphus.org/notes/first-at89x51/
Title: My first time using an AT89X51 microcontroller.
Metadata: {"date":"2016-10-14","id":"first-at89x51","kind":"note","links":[],"topic":"making","type":"note"}

My first time using an AT89X51 microcontroller. I built and debugged the circuit on breadboards, surrounded by jumper wires, handwritten notes, a programmer, and a multimeter. The LEDs, seven-segment display, and ultrasonic sensors made the code visible in the physical world.