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.
Project tutorial by nfarrier
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.
Use an Android device to control the color of a NeoPixel via a Bluetooth connection.
Project tutorial by Bryce K and Lucas W
Thank you, and that's a good question. It usually does work fine w/o them, but in actual use, radio interference (not just from radios, but nearby motors & switches) can sometimes cause very brief pulses of current, which can accidentally trigger the timer on or off--making it inaccurate.
I use them as a preventative measure, and because I originally learned about the phototransistor from here: http://learn.parallax.com/tutorials/robot/shield-bot/robotics-board-education-shield-arduino/chapter-6-light-sensitive-8
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