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Counting Box

MAKE

Nathan Pryor of Vancouver, WA, built this counting box for his son.

My 4-year-old son loves counting and numbers, so I built him a dedicated counting box. Select a value from 1-10 with the rotary switch in the middle, then push the big green arcade button to add that to the total shown on the LED display, or push the red button to subtract it. It’s driven by an ATMega, and the box itself is...

Don't be the product, buy the product!

Schweinderl