LEGO binary to decimal conversion [Carl] is doing a few experiments to see if it’s possible to build a calculating machine out of LEGO. He managed to convert four bits of binary into decimal.

Learn how to use Windows Calculator to convert Decimal to Binary in Windows 11/10. You have to use the Programmer mode to do this.

With decimal numbers there are "only" 10 possible values a single digit can be; 0 through 9, and to get numbers larger than 9 we just start adding more digits to the front.

The key of the build is the encoder wheel and pegs, which act as the “converter” between decimal and binary and actually performs the switching.