I need to control flashlights and make them blink uncoordinated compared to the others, but start blinking and then stopping at the same time according to the song, to create an special/visual effect. For example, when the lyrics say "shimmer", the flashlights blink for one second. Can one RF transmitter connected to the Arduino transmit different signals to each of the RF receivers in the flashlights? If so, what transmitter would it be and what is the circuit i need to do? If don't, then, how can i make it happen? (I am a newbie, by the way)
How exactly are you defining "flashlight"? What distances are involved with wireless?
Ron
Not possible because all the receivers receive all the time. You can write programs to make each flashlight respond only to messages with its address code in the message. You can reserve an address code meaning all receivers will process that command. It's all in your programs, not in the electrical circuits.
That's a rather involved project!!! Not really a beginner project. Maybe impossible as you've described it. 
But if you want to try it, take baby-steps. Maybe one flashlight first, without the wireless and without the audio control, etc. It's always best to "develop" your project in small bits (both the hardware and software).
Speech recognition requires lots of processing & processor power. It can be done on a computer, but I don't think it works well for lyrics (because of the music). Maybe the cloud servers that run Siri and Alexa can do it... And these applications only convert to text so you'd have to somehow capture the text before you can do anything with it.
You can have a .LRC lyric file, but you need the hardware/software to read it and synchronize it with the music.
Wi-Fi. Probably an Arduino & Wi-Fi board for each flashlight.
======================================
...I've done lots of sound-activated lighting effects but nothing wireless or with speech recognition. Mine are just activated by loudness or "the beat".
Lots of people make spectrum analyzers effects or "visualizers" which react the the pitch and volume. You can search YouTube for "Arduino Music Analyzer" to get an idea of what people have done. (A real spectrum analyzer is a measurement instrument but the concept is often used for lighting effects.)
Here is a picture of my "giant VU meter" (and my giant speakers), which has 6 other random sequencing/blinking effects and there are random variations such as the meters going "down" instead of "up", etc.
Coincidently, my van has 8 strings of 7-lights each in the ceiling. I re-wired them, making a 7-channel effect like my giant VU meter. It's a regular white incandescent "rope light" but I'm "thinking about" converting to RGB LED strings... I've been thinking about it for about a year while I lazily-slowly work on a couple of other projects. If I ever get-around to it, I'll update giant VU meter to RGB at the same time.
P.S.
For your 1st very-small baby-step, take a look at my World's Simplest Lighting Effect
Thanks, didn't mean "speech" recognition, only certain timestamp. Sorry if i didn't made it clear.
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.