There probably aren't many people here who deal with lightsabers and Arduinos but I have a question. When I turn my lightsaber soundboard on and 'ignite' it, is there a way for the Arduino to detect ONLY when the lightsaber is on?
Welcome to the forum
How about detecting the light from the lightsaber ? What do you want the Arduino to do if/when it detects that the lightsaber is on ?
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You can also measure current.
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How do I do that? Keep in mind I can't add a resistor to anything.
Keep in mind that we know nothing about you or your project - so you need to provide all the details
Why not? What prevents you?
There are a variety of current sensor modules for the Arduino/Rp. Pick one you like.
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Absolutely right! Just one single shop in this part of the universe offers already
So imagine what will be the number just within 1 light year around planet Earth, not talking about Disk World etc. ... 
To detect when an RGB lightsaber is activated using an Arduino, you can employ various sensors depending on the lightsaber's features. A light sensor, sound sensor, motion sensor, or a combination of these could be used to detect changes associated with activation. Additionally, if the lightsaber has wireless communication capabilities, you could utilize Bluetooth or other wireless protocols to communicate with the Arduino. By interfacing these sensors with the Arduino and writing appropriate code, you can reliably trigger actions in response to the lightsaber's activation. It's essential to consider the specific design and features of the lightsaber to choose the most suitable sensor and implement the appropriate circuitry for detection.
That looks like a computer generated response!
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It does - flagged.
Ok thanks.
If you are lighting the lightsabre with the Arduino, you will have the information in the program that runs the lightsabre, and that will let you know when the lightsabre is on.
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