Working in a cubicle where colleagues couldn't see when I was on the phone, I needed a device that lights up every time I'm on the phone.
Project tutorial by nfarrier
Two sets of timing gates for racing cars in a school solar car challenge that track and report the speed of each car in each of two lanes.
Attach an amateur radio to this and the radio will regularly identify itself so others can use their direction finding skills and locate it.
Measure how fast your Hot Wheels car moves at different points on your track or use it to tell how fast your race was.
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