Arduino Traffic Light Tutorial

The Arduino traffic light is a fun little project that you can build in under an hour. Here's how to build your own using an Arduino, and how to change the circuit for an advanced variation.

[Beni-cb]

thanks man you really are a life saver I am going to have an exam in my embedded class at 8:30 and watch this video at 7:00 I've got a lot from this. Now my exam will be well done!

[wag-on]

I remember doing this in primary school in 1985 on a C64 computer with some external device attached.I had to add up the binary values to have the lights switched on/off. I had it how you've got with 2 lights immediately swapping but the teacher got me to modify it so both lights were red before either set proceeded to green. Loved it - just wish I knew what that gadget was called?

[reinsaris]

8:10 when i compile changeLights()" on line 22 gives an error 'expected ')' before ';' token'. does anyone knows how to fix this?

[hadireg]

nice video. for the dual traffic light as done so far, a simple wiring G1 with R2 ; O1 with O2 ; R1 with G2. the ports can still handle the current I guess.

[galileibicasiamcyruzstev]

You said 10 kohm resistor at 6:07 but the color band in the picture diagram show only 1 kohm resistor (brown, black, red)... 10 k ohm resistor should be brown, black, yellow

[IOTmug]

here I am it is me: ) Thanks for creating video about me :)

[onnio]

You can make a counter feom 1 to 4, one up every 5 seconds for example. Then say that green is on when counter is 1, yellow is on when counter is 2 or 4 and red is on when counter is 3.

[guruprasadkulkarni]

how can i add another 4 led to make traffic signal?

[brotherandsisterA.K]

I don;t know but it is not working with switch

[AviationMaker]

red and yellow not turning on on sametime

[flowerdefknows]

i remember doing this back in year 7 <33

[christiancasasos]

yellow and red turn on before the green turns on

[funasfriend]

Could we extend the time duration of light

[habibsaliu]

my red and green come up at d same time how do i fix dis

[dane]

I followed your video & your written version. The Traffic Lights worked, until I installed the button & modified the sketch. Getting an Error Message


"Error compiling for board Arduino Nano". I'm using a Arduino Nano. Any thoughts? Please

[AnthonyGoodley]

I just bought a real traffic light. As in a full size real stoplight. Could code like this be used to control the lights so that it doea more than just display all the lights on all the time?

[ahmedkahie]

Nice Video, but do you know how to make a junction with four traffic lights. I have suceed with two lights but i don't know how to make with four.

[louisferreira]

how does the arduino board know to start with only the green pin at high and then all other pins low for 15s???

[alifsaifuddin]

why use 6 resistor 220 when u just use 4 resistor in the video

[BrianJennings-er]

I manage to write the code for the two traffic lights and a single button to control them, took me a while to sort the code out though...