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Need help my Neopixel boba Fett helmet
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Need help my Neopixel boba Fett helmet

by DJFETT on Sat Jun 20, 2015 9:52 am

The neopixel helmet works great with the alligator clip connected Vbatt and the to the neopixel lead but when solder it on to the board I get the strand test to only go half way then if turns off. does anyone know how much resistance i need in order to have it function properly? i need to finish this project by today i have an event coming up.

flora with battery on the JST connector
VBATT soldered does not run entire neopixel strand test
VBATT with alligator clip runs neopixel strand test perfectly

?....

battery specs are 3.7v 6600mah powering 350 neopixels

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Re: Need help my Neopixel boba Fett helmet

by adafruit_support_bill on Sat Jun 20, 2015 10:56 am

Please post a photo showing your soldering. At those current levels, a marginal connection could cause a sizable voltage drop.

Also, that is a lot of leds to drive with this battery. The maximum safe discharge rate for the cell is 6A. At full output, 350 leds will be pulling 20A or more.

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Re: Need help my Neopixel boba Fett helmet

by DJFETT on Sat Jun 20, 2015 4:50 pm

Image

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Re: Need help my Neopixel boba Fett helmet

by adafruit_support_bill on Sat Jun 20, 2015 5:46 pm

I can't see a wire connected to VBatt. Maybe just a strand or two coming from the back side. That's not going to do well at 6A or more.

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Re: Need help my Neopixel boba Fett helmet

by DJFETT on Sun Jun 21, 2015 4:27 pm

ok so i got a bigger battery 11.1v Lipo and a 5.5v voltage regulator the discharge rate is 35C. now i tested it but I'm having the problem of the flora getting burning hot. what can i do to prevent the flora from melting?

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Re: Need help my Neopixel boba Fett helmet

by adafruit_support_bill on Sun Jun 21, 2015 4:36 pm

Code: Select all | TOGGLE FULL SIZE
ok so i got a bigger battery 11.1v Lipo and a 5.5v voltage regulator

What kind of regulator?

I'm having the problem of the flora getting burning hot. what can i do to prevent the flora from melting?

For high power applications such as this, it is best to run the power and ground straight to the LEDs, then run power and ground from there back to the Flora. That way, all the LED current doesn't need to pass through the Flora.

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Re: Need help my Neopixel boba Fett helmet

by DJFETT on Sun Jun 21, 2015 5:14 pm

https://youtu.be/jyAxjb_svW8 this is what I'm using

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Re: Need help my Neopixel boba Fett helmet

by adafruit_support_bill on Sun Jun 21, 2015 5:19 pm

I don't see current rating on it. It appears to be a switching type regulator, which is good. Just make sure that it can handle the current for all those LEDs.

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Re: Need help my Neopixel boba Fett helmet

by DJFETT on Sun Jun 21, 2015 5:25 pm

the battery states that it will handle 35C what do you think?

the regulator specs are
2-3 Cell LiPo Regulator, 5.5v

Product Specifications

Continuous Maximum Current: 3.5A @ 5.5V
Input Voltage: 5.5V-12.6V
Input Connector Types: EC2
Length: 1.4 in (35.5mm)
Width: 1.0 in (25.8mm)
Height: 0.25 in (6.4mm)
Weight: 0.67 oz (19.0 g)
Wire Gauge: 18 AWG

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Re: Need help my Neopixel boba Fett helmet

by adafruit_support_bill on Sun Jun 21, 2015 5:49 pm

Continuous Maximum Current: 3.5A @ 5.5V

That is less than 20% of the maximum those LEDs will pull at full intensity. Most LED displays don't run at full intensity white for more than a few seconds at a time. But the average is usually at least 30-40%. You should have at least 2 or 3 of those regulators and divide the load among the pixels.

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Re: Need help my Neopixel boba Fett helmet

by DJFETT on Sun Jun 21, 2015 5:51 pm

do you know where i can find a regulator that would work or a battery more suitable for this. I'm running out of ideas and i know i could get this to work i just need some were to find the answer

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Re: Need help my Neopixel boba Fett helmet

by DJFETT on Sun Jun 21, 2015 6:48 pm

is there anyway that I could put the brightness setting on the strand test code lower in order to run all NEOPixels at a lower amp consumption rate?

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Re: Need help my Neopixel boba Fett helmet

by DJFETT on Tue Jun 23, 2015 8:06 pm

bump what about a 3.7v Lipo battery 7700Mah with a discharge rate of 100c

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Re: Need help my Neopixel boba Fett helmet

by adafruit_support_bill on Tue Jun 23, 2015 9:47 pm

Running at a lower intensity will consume less power. I think that you will find that 35 pixels on a helmet will still be blindingly bright at much less than full power.

You can also use multiple smaller batteries to share the load. To do this, separate the pixels into two or more independently powered sections. Connect all the grounds together, but keep the positive voltage sections separate.

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Re: Need help my Neopixel boba Fett helmet

by DJFETT on Tue Jun 23, 2015 10:29 pm

how can i change the "strand test" to run it at lower intensity?

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