08 3x1 buttons for TM16xx - maxint-rd/arduino-modules GitHub Wiki
Simple PCB for 3 push buttons to be used as extension to a TM16xx module with button interface.
Schematic/PCB: https://easyeda.com/Maxint/zowi-3x1-buttons-for-tm1637-matrix
Watch this video to see how the module was made and tested: