View Full Version : Stoplight Controller/Party Lighting

Pat Alonzi
12-07-2006, 02:58 AM
Hi Everyone,

I have a new project and could appreciate some input. Our town was recently replacing the stoplights at various intersections with new LED modules and was getting rid of a few signal heads. We'll leave out the detials but now I have a few. So far, I have cleaned, rewired, repainted, the lights. I am trying to make them work as lights for when we have parties at our apartment down at Purdue, **Home of the Boilermakers**, Sorry had to put it inĚ there. Ok well So far i have built a nice industrial control box with 8 channels controlled by the BS2 using a Darlington transistor to isolate the 2 circuits. Here is what I am curious about, Is it at all possible to have the basic stamp "listen" to a line level audio source and pick out the different frequencies to fire the different contactors? I am sure that it could be done with a small mic but I don't want it to be picking up all the background noise. If your curious as to seeing what it looks like so far check out the video: http://www.youtube.com/watch?v=h3Sqz9ObASU
In it's current form, I am just using a random number%2,3,4 to determine which light should fire.

Let me know your thoughts.


12-07-2006, 03:16 AM
Yes it is absolutly possabile to get the stamp to listen to something. I don't know what you know about audio so forgive me if I get to basic.

A mic simply takes a sound wave and turns it into an electrical signal. That signal is then pumped to the speakers someway or other which makes a magnet go back and forth producing sound.

Short answer - treat the signal like a mic on a robot that when you clap your hands the robot does something.

Phil Pilgrim (PhiPi)
12-07-2006, 03:16 AM
Take a look at the LMC567 tone decoder. Several of these (tuned to different frequencies) between the audio stream and the Stamp should give you the kind of data you need.


Pat Alonzi
12-07-2006, 03:52 AM
Haha, thanks for the refresher AIman.

I was thinking they were the same type of signal just that the line level signal is just a higher power and i could lower that with a stereo variable resistor (something around 100k ohms). Not quite sure how i want to do this. The other idea I had was to have the thing controlled by my laptop and have the bs2 basically just acting as a Serial 8 channel switch. Thanks for the help.