Hello,
I am looking to make a relay that can process input from a aux cord and close when it detects music. I figured an arduino would be a good choice to power this.
Details:
I work at a festival/farm where we use these to play pre downloaded songs. BooTunes (frightideas.com) we are planning to connect walky talky's to the speakers (through aux) in order to make announcements across the farm. I am looking for a way to tell the music controller to stop playing when the walky talky receives a signal, and came up with this solution. Any advice on implementation or other ideas would be great! Normally, I would just by parts and see what works, but this is for my job. I do not want to waste too much of their money!
My experience:
I am a highschool senior and have not used a whole lot of arduinos, but am taking comp sci 3 at my community college, so I can figure the coding part out. I am more confused about the electronics.
Actually the best way is to simply mute the sound make the announcement then turn the music on. Your radio should have a mute function, tap that and use that signal to turn on and off the mute. No processor needed. Good Luck!
I apologize, I do not think I did a good job explaining my project. We have multiple mp3 player/bootunes/dmx controller devices (link in my first post) spread out across the farm playing background music at all times.
The goal is to pause all of these separate, unconnected devices all at the same time to play one emergency announcement from the walky talky receiver. Someone muting each individual bootunes mp3 player manually is not feasible, neither is connecting them by wire due to how spread out they are.
This is why I thought a relay detecting an aux signal could be used to trigger the bootunes to be silent, only I am unsure of where to start. What Arduino would be the best choice to read and process the aux signal?
Recalling the old sound detecting relay circuits I googled for awhile and saw
which describes simple circuits that turn on an LED if there is an audio signal.
Above my pay grade, but it looks like it would operate fine on 5 volts, then the signal at the collector of the transistor (bottom of the 1K resistor on the LED) could be digitalRead() by any code that needed to react to the presence of an input signal.
Perhaps someone who actually knows will comment and confirm or suggest a circuit as sim,e as this what woukd actually work.
Thank you! That looks like what I am attempting to build. I'll have to do a lot more reading into that to make sense of it all. Thank you for taking the time to find and share that though!
Just know that the resistor and LED in the circuit could be replaced (or used in parallel with) a small signal relay.
When relays are powered by transistors in this manner, a diode should be added. Here's a schematic I found online just now, D1 (1N4001) what I'm talking about.
With the signal not coming from a digital output but from the detector circuit like in the other schematic.
Generally we would prefer a totally over-engineered solution using an Arduino, even where there is no need.
