Additional Parts Required: Duct Tape and Baling Wire!

April 26, 2004

Whiz kids (and Colorado State University engineering students) Curtis and Dennis built a cool learning toy that tests the user's knowledge of binary numbers. A microcontroller generates a random 16-bit number that is converted to 8-bits and displayed in binary form using eight LEDs. If the user's guess (entered in decimal form) matches the number, a motor activates a shaft, releasing a gumball. If the guess is wrong, an appropriate sound for a loser is produced through a digital sound module.

Binary-to-decimal learning machine parts list
Amt Part Description Allied Part #
1 24V, 1.7A power supply 298-0108
1 12V regulator 935-3050
1 5V regulator 935-9372
8 Red LED 505-9500
1 Blue LED 509-9720
1 Red LED for testing 505-1348
1 1k Ohm potentiometer 753-2260
5 0.1 mF capacitor 852-5685
1 1.0 mF capacitor 852-5674
1 Solid state relay 788-0168
1 Proto type board (large) 977-1951
2 Pushbutton switch 747-0790
1 Toggle switch 757-4885
To see the entire project in pdf, go to

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