Light source used in Disco Lights

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I wanted to control disco light from AVR for some lighting related project. I opened one of the disco lights (https://www.amazon.com/Activated-Equipment-Control-Parties-Birthday/dp/B09339JF5G/ref=sr_1_5?dchild=1&keywords=disco+light&qid=1635616045&sr=8-5). But could not understand what type of LEDs (light source) they use. Attached is the picture of the opened light. There are no resistors used in the light. I removed power input of the light and directly connected 5V across the light source and it worked. But cannot connect to AVR without knowing the rating. Wanted to to get the specification/datasheet of these light sources.

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It is either 3x1W or 3x3W. Why you like to use AVR on this complete product, please.

Last Edited: Sat. Oct 30, 2021 - 06:36 PM
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Show the electronics---showing only some LEDS is not much!!!

They will have some driver circuit that limits the current (may not see resistors)

 

 I removed power input of the light and directly connected 5V across the light source and it worked

That was a mistake...you may have gotten lucky with a supply that was too weak to burn out the LEDS...but if you hooked to a 10Amp bench supply, it might have been a different story. 

Never just hook power to LEDs without knowing how the current will be limited.

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

Last Edited: Sat. Oct 30, 2021 - 07:17 PM
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Just hobby project for kids.

I think I will use 220E resistor. Assuming forward voltage drop of 1V (I guess it will be more than that), max current will be 18mA, which is within the max current per I/O pin (328P).

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joneewheelock wrote:
max current will be 18mA,

Be prepared for a dismal performance as compared to the product photo showing it fill the room with light.

 

Be prepared also for some disappointed kids unless you implement the "3 sound activation modes + 7 built-in color modes ... Change colors and speed based on changes in nearby music";  and also get the remote control to work.

 

BTW: That thing will have LED driver transistors or perhaps constant current IC. Why not reverse engineer it and use the components on the PCB ?

 

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joneewheelock wrote:
I think I will use 220E resistor.

 

Use 2.2 ohm and Mosfet. Pulsed drive control is safe, one led at time.