I designed this board to demonstrate how to use the 74LS47, so you do not have to waste extra GPIO for driving your display.
The board shows all the inputs and outputs of the IC, so they can be manipoulated to see what impact it has on operation. The output can be swapped from a set of LEDs to a 7-segment display. There is also an "auto" mode, where an AtTiny 85 increments through the BCD codes automatically.
See more on my GitHub! Link Here.