ELECTRONICS: FUN AND FUNDAMENTALS
MAGIC 8 BOX
Use rotary encoders to make a digital fortune teller.
Everyone wonders about the future — which may explain why a fortune-telling toy called the Magic 8 Ball has been a popular novelty item for more than 50 years. Shake the ball, ask a question, turn it over, and words of advice appear beneath a plastic window (Figures A and B). The lettering is actually embossed on the 20 triangular faces of an icosahedron, floating in blue dye. Figure C reveals the secret.
Fig. A: The original Magic 8 Ball, so famous it even has a Wikipedia entry.
Fig. B: The Magic ...
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