Would is be possible to power LED strips using USB

[nathaniel]

Hi,

I recently bought a BlinkStick Pro with LED adaptor and wired them up to a strip of LEDs. I was wondering if the barrel plug could be replaced by a USB power source someway instead.
The specs of the provided adaptor are ‘IN: AC110-240V - OUT: DC12V/3A’, and these are the lights is it in anyway possible?

Thank you!

[nathaniel]

Also one other question, my Pro with LED adaptor appears as a flex when sudo blinkstick -i is run in terminal as shown below, is this normal?
Thanks again!

[p0ke]

Hey Nathaniel,
a USB power supply with your given specs should not be a problem. The barrel should be connected like this:
Power Supply: (-) -(o- (+)

If you need to solder it to the board take a look at this:

Pro led Adapter with Dioder

Hmmm… weird. No soldering point for GND on yours like on my LED adapter board. It should be possible to connect GND to one of the points on the image: [image]

The thing with the description is weird… I have a BlinkStick Pro 2.1 and this isn´t recognized as a flex. Maybe @arvydas changed the firmware? But the description should not be a problem for you.

Edit: Sorry, haven´t seen that one: [SOLVED] Win 8.1 detects BS Pro as BS Flex
So it is a issue with a few devices.

[nathaniel]

Okay, thanks!
Hope you had a good holiday season!

@arvydas, is there a way to call brightness in a script?
For example:

def cinemared():
    for bstick in blinkstick.find_all():
                bstick.set_inverse(True)
                bstick.set_color(hex='#ff0a0a')

Is there a bstick for brightness that I’m missing as both bstick.limit and bstick.brightness are not recognised.

Thanks!

[p0ke]

Hey Nathaniel,
there is no function for brightness in the python module.
Please take a look at a simple script I´ve wrote for that purpose:

from blinkstick import blinkstick
import time

led = blinkstick.find_first()
Brightness = 20

led.turn_off()

r = 0
g = 0
b = 0
r,g,b = led._hex_to_rgb("#ff0000")
r = (Brightness / 100.0 * r)
g = (Brightness / 100.0 * g)
b = (Brightness / 100.0 * b)

time.sleep(0.02)
led.set_color(red=r, green=g, blue=b)

“Brightness” is a value between 0 and 100. Feel free to try it out.

[nathaniel]

Thanks @p0ke, that worked great!

def goDarkBlue():
    for bstick in blinkstick.find_all():
                Brightness = 5
                bstick.set_inverse(True)
                r,g,b = bstick._hex_to_rgb("#3F89FF")
                r = (Brightness / 100.0 * r)
                g = (Brightness / 100.0 * g)
                b = (Brightness / 100.0 * b)
                bstick.set_color(red=r, green=g, blue=b)
    return redirect("/") 

Is how I adapted your sample script.

Thanks again.