2 layers

SensorBoard 5v
knoerk/MicroGasExchange
Software, Circuits and PCB for microcontroller based gas exchange system
68 partsGPL-3.0
Boards in 1 GitHub repository, designed in KiCad, that use the PCA9516AD by NXP Semiconductors (-40℃~+85℃ 2-Wire Bus 2-Wire Bus 3V~3.6V 5 6pF Auto-enable、Bus capacitance isolation SO-16 Signal Buffers, Repeaters, Splitters ROHS). See how each wires it, with its parts, size, README and files; the PCA9516AD’s symbol, footprint and pinout are on its own page.

knoerk/MicroGasExchange
Software, Circuits and PCB for microcontroller based gas exchange system