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traffic lights - Coggle Diagram
traffic lights
size
tall
big enough to be seen from far away
large LEDs
output functions
lights
timer for crossing
disabled traffic output
components
LEDs
microcontroller
buzzer
cost
inexpensive but safe
production
installation cost
inputs
a button
something to detect cars
aesthetic
black body for contrast with light
early seen from any direction
safety
enough time on red light for people to cross
safe to press sealed against weather