Making traffic light from cardboard,some leds,wires,paper clips,
tools,hot glue gun,sharp knife,for powering I am using 9v battery
and for lights 3 or 4 leds in serial connected bcz 3 leds are making
9v together.
source
source https://gadgetsteam.com/2019/05/17/how-to-make-traffic-light-from-cardboard/
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