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Author Topic: Arduino VU meter using 240v lights.  (Read 2460 times)
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St. Lucia, West Indies
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Can this be the solution to my problem?
http://www.sainsmart.com/16-channel-12v-relay-module-for-pic-arm-avr-dsp-arduino-msp430-ttl-logic.html
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Well...   It would probably "work", but I wouldn't recommend mechanical relays in this application.   They are basically a mechanical switch controlled by an electromagnet and they don't "like" to be switched on & off many times a second. 

And, they will "click" or "chatter", which could be an issue....  Probably not a big issue if the music is really loud! smiley-wink

There are solid state relays that operate from less than 15mA.  I don't know if you'll find one you want to use, but for example  this one has in input resistance of 1000 Ohms, which means 5mA @ 5V.   But, it's more bulky and more expensive than the one you are planning on using.
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