2 layers

IR Schreib Lesekopf RS232 Neu
ju6ge/volkszaehler_ir_pcbs_kicad
Converted Volkszaehler PCB Layouts to KiCAD
24 parts
Boards in 2 GitHub repositories, designed in KiCad, that use the MMSZ4689 by Jiangsu Changjing Electronics Technology (CJ) (-65℃~+150℃ 1 Independent 10uA@3V 350mW 4.85V~5.36V 5.1V SOD-123 Zener Diodes ROHS). See how each wires it, with its parts, size, README and files; the MMSZ4689’s symbol, footprint and pinout are on its own page.

ju6ge/volkszaehler_ir_pcbs_kicad
Converted Volkszaehler PCB Layouts to KiCAD

greenMikeEU/shrdzm
SHRDZM (just a name, not an acronym) is an ESP8285/ESP8266 based sensor and actor integration platform.