who /diy/ around here?
it working
>>51847915
A BOMB
>>51847915
cool clock, anon
>>51847924
Very nice, anon!
>>51847945
cool cluck, faggot
>>51847915
Ahmed, is that you?
>>51847970
you wish - im not getting arrested
>>51847945
it plays imperial march too, just doesn't display anything at the same time though, work to do still
>>51847915
How is Qatar treating you?
quick dump of some older pics
>>51847915
>Using a microwave transformer in case your clock draws more than 1KW
Nice!
>>51848067
>>51848081
>>51848104
>>51848076
i WAS having heat issues before. It is hard to run 5 microcontrollers off a single linear regulator.
i had to change it to a switching regulator to handle the 0.5 amp they draw. You can see it stacked on top of the otehr one on the left
>>51847924
>Those two dead pixels
muh OCD
>>51848438
His project seemed perfect before you pointed that out. I want to unsee the dead pixels
>>51847915
dat wiring
also was that breadboard card originally meant to plug into an ISA slot? sure looks like it
>>51848081
Are the supports built with solder..?
>>51847935
Hello lads
>>51848483
yep, had a few lying around. Solder and a hacksaw make for good projects
>>51848512
yes, soldered some copper pipe together, and the LEDs are held up with solder on the back.
>using heatgun to attach LEDs to copper pipe
>>51848438
blame the heatgun
>>51847935
The good old American reaction whenever Americans see LEDs and/or circuit boards. The rest of the world knows you need explosives before anything "looks like a bomb"
/diy/ here
Did you drill the holes on a mill, or use some template?
Spacing is great.
>>51848081
>soldered every LED together instead of using sockets
oh god this is endgame everybody, ENDGAME
>>51847915
is that a dev board with an ISA edge connector built in?
how long has that been lying around for?
>>51849510
says copyright 1985 on it
>>51849275
holes one what? there are 4 holes that were really big for the copper pipes, that was by eyeball with a drill. The LED spacer thing was with a laser cutter.
>i love lasers
>>51847915
I am! Working on a flanger in DSP for my senior project. It works pretty well!
Feeding in a 1kHz sine wave (gray) and the flanged ( blue) output looks awesome!
>>51850059
basicly making a phasor effect?
i need to get into DSP myself. some color reactive lights would be cool
>>51850124
They are pretty similar. A phaser works by making a copy of the input signal, and phase shifting the whole signal based on its frequency. It then blends the two signals into each other creating evenly spaced harmonic construction and destruction. A flanger works in the time domain rather than the frequency domain. It splits and adds the signals together just as a phaser, but instead of phase changing, it adds the original signal back onto itself without modification, delayed in a varying range of .5 ms to 15 ms. The delay goes back and forth over time.
Tldr;
Flanger is time based and adds a varied delayed version of the signal back to the original signal.
Phaser is frequency based and adds a delayed, phase shifted version of the signal back onto the original.
The code is actually on github if you are interested. Hasn't been formatted how I want yet, but she is there.
>>51847915
nice try ahmed
Here's a thing that I'm working on. Just a simple dual triode transformer amp.
>>51847915
See Ahmed that's how you build a clock
Dumping some pics of my new project. It's a five finger "power glove" audio video synthesizer based on my earlier work with light guns: https://www.youtube.com/watch?v=tJvaH2gRwj8
This is the stack of four boards used for the finger positioning. The board on top shows the X,Y,Z position of the fingers.
>>51850754
This is the phototransistor interface board. Phototransistors are on the wires coming out of the top and go out to fingertips. There's two main parts here: Amplifiers and edge triggers which pick up when the raster beam hits the phototransistors and send a pulse to the XY positition boards. Distance of the light sensors from the screen (Z) controls audio volume, which is done with peak detectors running to voltage controlled attenuators.
>>51850754
looks like feedback hell
nice colors though
How are you driving the VGA? i've done on an FPGA before
>>51850826
This is the circuit board that gets X,Y positions. The transistors on the right form ramp circuits. One triggers on the VGA Hsync and goes up to 100% as a line is drawn. The other triggers on Vsync and goes up to 100% as an entire screen is drawn. The chips to the left are sample and hold circuits that store the voltage of the ramps when they get a short pulse from the phototransistor edge detectors. The values being stored indicates the position the raster beam was at when the phtotransistor detected it.
>>51850916
forgot picture
>>51850838
>>51850938
>>51850991
This is the board that generates the VGA signal. HSYNC, VSYNC, and porching. It's done with a crystal oscillator, 4040 binary counters for clock division, and a lot of diode based AND and OR gates.
>>51850991
>diode logic
wow, old school, but so simple it just werks
i hate the porching with VGA, it annoys me how if it is a little off, my LCD monitor jiggles the image around. Is it any better with a real VGA monitor?
>>51851006
So your VGA timing is generated with digital counters, but you use analog timing for the light gun position? Any reason you didn't use the digital counters from VGA timing for that purpose?
>>51851073
If it's consistently off, your LCD monitor should be able to correct itself with the autoset button. Display a 1 pixel checkerboard for bonus points to help it set phase correctly.
VGA monitors have horizontal and vertical position/size controls for the same reason.
>>51847915
sup.
working on speaker crossovers, and just finished making a thing to auto on/off the lights in my room based on the time
>>51848150
why the fuck are you using 5 microcontrollers anon?
>>51851100
it displayed everything just in terms of color, size, aspect ratio, etc, it just would flicker the image left and right by a single pixel every other frame.
im just gonna say the monitor is shit and only worry about it if i ever use VGA again
>>51851118
one as the master, 4 slaves, one per digit. It is just to make the board look fuller and have LOTS more wires. If i simply multiplexed it or something, then it would have been boring and easy, so i went for overkill.
they really just sit idle most of the time though. I will figure out some use for them since they are all interconnected
>>51851080
I'm generating analog voltages from the positions of the light gun sensors and sending them to voltage controlled oscillators to generate audio, so I've got to go to analog at some point in the system.
I could have used D-flip flops and latched in the value from the binary counters in the VGA generator, then gone from that to analog with R2R ladders or some other type of DAC, but then I need ten octal-D-flip flop chips and ten DACs to get X,Y position of five fingers. By going to analog one step earlier I can avoid having to build ten seperate DAC circuits.
>>51851196
oh, so are you multiplexing per didget then?
any obscure / custom comunication between them? or just text commands over serial?
>>51851332
each of the 13 "mega-pixels" have a line to a transister. each transistor has a line to the microcontroller. No multiplexing of ANY sort is going on. litterly a dedicated microcontroller pin PER 4 LEDs
the comm lines are 5 lines connecting the same pins on each slave together. i was planning on 4 data and 1 clock.
i am thinking high bits on clock rise, and low bits on clock fall. that would be a full byte each clock and then i decide later what to do
i still need an RTC for this thing
This belongs on /diy/ or /sci/
>>51851073
It seams like every monitor responds to bad porching differently. I'm using a 90's CRT that will dim everything if the porch starts to late or ends too soon because it uses the 0v it's supposed to get there to calibrate brightness and contrast automatically.
I've run into some monitors that just completely turn themselves off if porching isn't perfect. This is why you don't let shitheads make error-handling decisions.
I had a really nice CRT from the early 80s that didn't care about porching at all. The electron beam would leave diagonal streaks across the monitor if you were sending RGB when it was moving into position during the porches, but that makes perfect sense. It didn't try to be clever and do weird shit when things weren't perfect.
>>51851575
that would be the obvious thing to have it do, since the porch was suposed to be there to deal with that. Why try correcting something that was known about and activly decided to be dealt with in a certain way already.
tl;dr porching was a solution, dont make it a problem
Nice clock achmed
>>51847915
It looks like your pixels are 4 LED's each or is each LED individually addressable?
This one is mine, each LED is individually addressable. I couldn't think of anything to do with it so I scrapped it.
>>51851858
2x2 groups. The led legs were simpler to assemble in groups like that.
>>51847915
What kind of project should I work on during my break? I just finished my second year of Electronic Engineering.
cool clock Ahmed, why don't you bring it to the white house?
>>51847935
GIVE THAT MAN A HANDOUT
>>51847915
Very nice
My PSU is old so it doesn't have fan control, that is it revs always at 100% regardless of the load. It was loud as fuck at around 60-75 dB so I added a potentiometer between the fan and the PSU.
I can't even hear it now <25 dB
>>51852409
Oh and also I tried making an FM transmitter so that I can us use my phone as wireless earphones using FM radio, but I soldered the transistor wrong (BF494 looks normal but base collector and emitter are at different positions than the usual)
Now it's just trash
>>51852475
doing things like that make a mess of the frequency space around you. make sure those kind of things are very low power, unless you want to jam the local area
>>51852034
this is the hardest part, the idea. how about a little triangle bot or something?
>>51852089
Don't you mean cool cock, since that's the thing you love the most :^)
>>51851496
It may be /diy/ related, but /g/ needs more threads that aren't basic consumerist shit.
>>51848067
>diy
>that immaculate wiring
Pick one
[spoiler]or teach the rest of us[/spoiler]
>>51854507
kek
>>51848552
That retarded sandnigger boy needs to be killed by ISIS for sure
>>51854507
What else do you use your cluster for?
>>51854473
>immaculate
this is nothing compared to how i wanted it to look. It turned into a giant mess the 3rd time i re-soldered basically everything.
>planning is key to not being an idiot
>>51848081
>>51848104
this is really beautiful. But damn you need to fix the two dead pixels.
>>51852549
>Omnidirectional Wheels
>hnnng
>>51851271
>Tetris - the circuit board
>>51847935
How did you come to that conclusion from those photos? You can't see the colour of his skin.
