Discrete 8-bit CPU
A working computer built gate-by-gate from 74LS chips: bus architecture, microcoded control, and sixteen whole bytes of RAM.
74LS logic / EEPROM / Assembly / KiCad
ERIC LUO
Computer engineering student. I build small machines, print useful objects, and write down what breaks.
LAN receipt printer
A thrifted Epson TM-T88 turned network appliance: an ESP32 web server feeds it ESC/POS, so anything on the Wi-Fi can print a note.
ESP32 / C++ / PlatformIO / ESC/POS
3D-printed cone light modifier
A parametric flash-to-softlight cone, printed in white PLA and tuned over nine revisions until the falloff earned a place in the bag.
Fusion 360 / 3D printing / Photography
2 min
Put an LED on it: observability for breadboard computers
The cheapest debugging tool in electronics is a resistor and a light. How blinkenlights carried a 14-breadboard CPU build, and what they replace.
1 min
The case for the single-purpose appliance
A receipt printer that only prints notes is more useful than an app that does everything. Notes on building the LAN printer and why constraints made it good.
2 min
Nine prints to a good part
Iteration logs from the cone light modifier: what each failed print taught me about tolerances, surfaces, and knowing when to stop.