I spent one class period each with 3 – 5th grade classes to code the micro:bit and neopixels to send some morse code (you also need 3 alligator clip wires). I thought that using number of lights would be easier than how long a light was on would be easier to understand dot/dash. In one class period we only got as far as lighting up 1 light for a dot and 3 lights for a dash. They were going to work on it further the next time class met to actually send a message
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