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Topic: Help with wiring up LED strips (Read 586 times) previous topic - next topic

larryd

You cannot power large loads from the 5v pin on the Arduino.


You need to use a limiting resistor on each input on your strips, see previous image offered you.

You could power the Arduino and strips with a 5v USB battery (as shown).





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raschemmel

Why are you running the circuit without the 86 0.1uF capacitors ?

tunaspleen

Why are you running the circuit without the 86 0.1uF capacitors ?
Because I am a complete electronics newb that has no idea what you even said or how I would even go about attaching those to an LED strip.

raschemmel

#18
Jul 13, 2019, 04:02 am Last Edit: Jul 13, 2019, 05:25 am by raschemmel
The link you posted was for individual leds  , sold from a reel, not a strip.
If you MADE the strip it was your duty to LOOK at that data sheet (that YOU posted) and ask about the caps from +5V to GND at every led. The caps must be wired DIRECTLY to the power (5V) and GND pins of EACH AND EVERY ONE OF THE EIGHTY- SIX LEDS.
If you haven't done that, you need to do that NOW.

larryd

#19
Jul 13, 2019, 04:07 am Last Edit: Jul 13, 2019, 04:14 am by larryd
Connect 'Out1' to Arduino 5v pin.

Even better, plug an A/B cable into the USB jack on the Arduino.



Connect 'Out2' to LED strips, see image in Post #11.



When the Arduino is connected to the PC, do not connect the Arduino to USB Battery pack.







No technical PMs.
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raschemmel

#20
Jul 13, 2019, 04:12 am Last Edit: Jul 15, 2019, 05:10 pm by raschemmel
@Larry,
I don't think he can wear that on stage.

Read Reply#8

86 leds each drawing 48mA = 4.1280A

Also, you cap is too small.
You need 1000uF , NOT 100uF

Also, the maximum load current the arduino 5V regulator can support is 800mA.

Your load exceeds that by 4.1280-0.800  = 3.3280A


Your circuit draws 3.3280A MORE than the arduino 5V regulator can support !

The regulator will immediately overheat and shutdown.

The portable USB chargers Larry linked may have a 5Ah rating but the internal regulator that
supplies the charging current is a 1A regulator, not 5A so it won't source 5A.

You could get a bunch of these and a bunch of these and make a belt to hold the 9V
batteries side by side, (like an AMO belt or a Batman Utility Belt) and wire two or three 9V batteries  in
PARALLEL to the input of EACH of the dc to dc converter modules (also mounted on Utility belt) and then
wire ADJUST THE OUTPUT VOLTAGE POT on EACH dc to dc converter to 5V exactly and wire ALL the dc to
dc converter outputs in PARALLEL to the input of your LED strips so the only connection the led strips have to the arduino is a GND and a SIGNAL (DIN) and the GND and 5V comes from all the dc to dc converters wired together in parallel.

That way each dc to dc converter will have two or three 9V batteries supplying it and the all the dc to dc converter outputs will be wired to the led 5V input.

The key thing to remember here is that even if you individually adjust the output voltage pots of all the
dc to dc converters to 5V, as soon as you power them up in parallel, there may be a change in the output
voltage so you have to READJUST them to get 5V at the output BEFORE you connect it to the led strips.

 

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