Hila Traffic Light


This model traffic light uses aluminum strips
as switches. Press a switch and a light comes on.

Instructions for constructing this traffic light.

Traffic Light Template - PDF

My traffic light doesn't work!

1: If only one light is not working, press hard on
the tacks holding the wires and aluminum strips.
One may have come loose.

2: If none of the lights work, try a new battery.

3: If the new battery doesn't fix the problem,
press all of the connections on the "-" side
of the LEDs including the resistor.

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