JLCPCB

74HC595 Complete Guide (2026): Wiring and Arduino Code

A thorough guide to using the 74HC595 with Arduino. Expand your GPIO without limit using just three signal lines — from shiftOut() to hardware SPI, with schematics, KiCad design files, and sample code. Fully compatible with the Arduino UNO R4.

ESP32 Network Clock (1): PCB Design with KiCad and JLCPCB

Part 1 of building a network-connected digital clock with an ESP32. Six large LCD panels driven through three MCP23017 I/O expanders, NTP time sync backed by an RTC, the whole thing laid out as a PCB in KiCad 8.x and ordered from JLCPCB.