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What are your thoughts about using a sensor with a greater range of detection?HC-SR04 is an ultrasonic ranging module that provides 2 cm to 400 cm non-contact measurement function.400cm or 4 meters or 13feet. The average car or sedan is 190 inches / 15 feet. I think you would need to use a sensor that can see farther than 13 feet.. it's probably not enough distance to give you a reaction time. A LIDAR sensor would give you a range of 40 meters! This would give you a better chance at reacting to a traffic event. https://www.sparkfun.com/products/14032 149.99 - quite a bit more expensive.
Great Project! Here are the instructions for an RGB (Red / Green / Blue) LED and only using resistors. It will have a few less wires and the same results!https://learn.adafruit.com/adafruit-arduino-lesson...Another Idea is to hook up some potentiometers so that you can choose the color of the RGB LED by just turning the potentiometers. Each one will control one of the three colors.
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What about getting a digital scale and just zero out the scale with the tub - fill it with completed parts and weigh them. Divide the total weight by the weight of 1 single item. The parts look very consistent and should have the same weight?
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