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MAKE THIS!
DIFFICULTY
Experimenting with an automated spirograph during a beta testing workshop.
MAKE THIS!
DIFFICULTY
The Bachelor is a deadly robot who is half drunk half the time.

We made The Bachelor with two continuous servo motors, two LEDs, and one deadly LASER. The Bachelor's only input is a switch which turns all outputs on simultaneously. The laser and LED's all blink at different tones. The LED's serve as eyes, and the laser functions as The Bachelor's arm. The servos spin vertically and horizontally to control jaw and head movement.

Here's a couple videos:
http://www.youtube.com/watch?v=Rr-nZErpLVw
http://www.youtube.com/watch?v=EQ0BkjL8YE
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DIFFICULTY
This device takes a temperature and displays a blue led for low temperature, green for the mid ranges, and red for the high ranges. An alarm sounds if it get too hot.
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DIFFICULTY
This program implements a 3-bit binary counter in LEDs.

Input 1: Button
Output A: LED
Output B: LED
Output C: LED

As long as the button is held down, the program counts from 0 to 7 (and then repeats), with a 1 second delay in between each count. The value of the counter is displayed on three LEDs, with the lowest bit on Output A and highest on Output C.

This a translation of this exercise: http://rooseveltcs.org/courses/intro-to-cs/assignments/#assign11