Welcome to CuVoodoo,
the sorcery of copper.
In this video I will talk about the light installation I did in my room,
so I can have pretty nice lights.
But first a small announcement.
As you've probably seen, or not,
in all the previous videos
I added subtitles with the transcript of the video.
I will stop doing this because it is just too much efforts.
It takes around two full days to transcript a half an hour video,
and this is just too much work
for too little gain.
So I will stop doing the transcripts of my videos.
I will still add subtitles,
so I can correct my mistakes
or I can add more information about what I say.
THE END
something fancy
The cold blue color fades since then.
It's "kelvin", not "degree kelvin (°K)".
It's not very visible on the camera.
The blue component probably also faded away.
control the brightness
This is hard to hear on the camera and after audio compression.
GM1351 sound meter, sold under various brands.
1 dBa gain = 1.25 times louder (than ambient noise)
This fan is very silent actually.
The hum is the second noisy part.
louder than ambient noise
HS1010A light meter
1 lx = 1 lm/m²
the sun doesn't shine in my room
IKEA ES11L0602 (11 W, 650 lm, 80 mA @ 220-240 V)
during the day
but that doesn't affect the illuminance measurement
11 W CFL = 650 lm, ~ 50 W incandescent lamp
The CFL service life rating barely considers the exponential luminescence decay, ballast failure, and short on/off switching.
And they cost a lot more.
The fastest CFL luminescence decay is soon after its first uses (exponential).
50 lux
and with homogeneous light
Here when I mounted the light installation.
And here when I removed it.
And the power transistor on the bottom.
Actually I use the 5 Vsb (standby).
All of them actually.
Maximum 2.5 A at the 5 Vsb rail for a 350 W ATX power supply.
pin 16: PS_ON#
pin 8: PWR_ON
to mains
bodged = the top doesn't have a bump
brightness
and a couple of resistors
Here a closer traveling view.
Here the flaky segment again.
There is an efficiency droop around 100s mA.
Speed up to 10X.
18.432 MHz
And two capacitors for the 12V lines.
heat sink
LED strip beginning
LED strip end
5 V / 4.7 Ω = 1.06 A, 5 V x 1.06 A = 5.32 W
2 times the PWM and its inverse
each 5 meters strip
I used an LPKF ProtoMat S63
duty cycle
switch on
over the whole period
it's not very fast
Maple Mini from LeafLabs
STM32F103RCBT6, 32-bit ARM Cortex M3 microprocessor
12 PWMs
140 mm x 86 mm