2 layers50 × 47.5 mm

Gfc
atx/gps-freq-counter
Frequency counter using a GPS receiver PPS output as its reference
101 parts6MIT
Boards in 1 GitHub repository, designed in KiCad, that use the 24AA32AT/SM by Microchip Technology (-40℃~+85℃ 1,000,000 cycles 1.7V~5.5V 200 Years 32Kbit 400kHz 5ms Hardware write protection function、Noise suppression function I2C SOIJ-8-5.28mm EEPROM ROHS). See how each wires it, with its parts, size, README and files; the 24AA32AT/SM’s symbol, footprint and pinout are on its own page.

atx/gps-freq-counter
Frequency counter using a GPS receiver PPS output as its reference