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Binary Weaving
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Computers use binary numbers (Base 2), a series on "ons" and "offs" that encode information.
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Fun, but a bit complex
The explanation and the chart breaking binary down into letters is very useful and informative, but the activity was a bit challenging for the kids I've tried this with. I've done it with kids up through 6th grade, and while they liked the idea of making patterns with binary, they had a hard time executing the concept. I did not have them create simple codes, but rather try to write their name in binary beads. I did give students them a chart that they could write out what their binary pattern was, and that was a good aid to have on hand. It also might be useful to add a third bead color to use as a separator between words, I would recommend this project for older kids, 6th grade and up at least.