Ben Heck’s Rewind & Recap - POV Display
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- เผยแพร่เมื่อ 12 ก.พ. 2015
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element14.com/tbhs - Ben revisits one of his old projects and comments on what he would have done differently if he had more time. In this rewind and recap episode Ben discusses what went wrong with the persistence of vision display.
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What about getting rid of the brushes all together and powering the display through induction?
R.I.P Alison
Why troll Like that not funny
She is not dead.
He maybe a kid & not get it...
I know I was only joking
I've always wanted to see mistakes and failures on here.
The way the show is filmed it seems like you just get a idea and it just works when you build it and that seems discouraging to people that are new to this. Every-time someone tells me "I have no idea what i'm doing" I almost always say "Yeah, neither do I".
Subbox didnt show this yet...
I would have used a cylinder instead of the frame for mounting the LEDs - it would have been much easier to spin, not to mention , since you did not use surface mount LED's, you could have drilled holes in the cylinder that the LEDs would fit in - and you would have all the wiring inside the cylinder.
I agree 100% with you great idea.
yea make much more sense can even increase resolution to 2 lines or even 4 (offccentered)
Actually, I read somewhere that the human eye has a pretty dismal persistence of vision rate- 12fps the cited minimum. However, the higher the frame rate the smoother the animation, and the less likely a human to notice flicker. Fact: Sega was able to get away with 3D images on the master system with shutter glasses on frame rates as low as 50fps (25 per eye, taking advantage of interlacing) on a CRT display. So yeah- when NVidia tells you that we can't use their 3DVision glasses with existing 60fps monitors because of "flickering", it's BS.
So, when can we expect *POV Display: Episode V - The Alyson Strikes Back* to come out?
"Because it sucked before" - you should have left that in the episode and not in the cut scenes at the end. It was perfect timing and excellent delivery, Ben!
Could you have put the microcontroller on the spinning thing and so reduced the number of brushes to two (for power)? Or three brushes if you had pwm for the motor.
you could also use metal ball bearings on the main shaft to transmit the power too. power transmission without the drag of brushes.
That rotating LED display technology was used in the super-rare Adventurevision video game console, although instead of spinning the LEDs it spun a mirror thus saving the need for contacts, recreating one of those might be an interesting idea for a future project
Or the VIrtual boy that used an oscillating mirror and a row of LED's
And she's back! lol
But her time on Ben Heck Show is ending
But in the previous video she was already gone
What about mounting the LEDs to a tube to reduce air resistance? Also, would counter-balancing the weight of the PCB + LEDS help?
Don't you think that the filament on your delta printer would not slack as much if you passed it over the first pulley and under the next one, or vice-versa?
Drill your holes with your laser cutter, I do. The laser cutter can do the solder mask too.Saves heaps of time. You can cut the board out with the laser too.
This was interesting. One thing I thought was that since the 2 shafts that mount the spinning part to the frame, are not connected. Couldn't you use those to power the board - i.e. brushes directly on the shafts? Should be the least amount of drag possible? Thanks for the videos though - always eager to see what you make next!
For positive and negative brushes, could you send power through the axles?
Wooo! Love this show
The main control µC, along with the could be put on the display frame. Just flash the contents on beforehand. Transfer power through the bearings, and use a big cap to store power. As long as the heavy stuff rotates around the center it shouldn't be an issue.
I would have powered the POV using ball bearings, one end for positive and the other for negative, and maybe add a capacitor on the POV to stabilize the voltage.
find the best gear ratio with a smaller gear on the motor that allows it to more freely spin faster? torque vs speed.. its a balancing thing.
Luv this show
Nice reflection. Great videos. I would like to see more Arduino projects. Going to miss Allison...
My first thought: use two coils and induction to wirelessly power the board. You could even modulate the voltage to provide data to the display (similar to how NFC works).
Becuase you're taking out Alison, This is like when they discontinued the B-Team on MythBusters.
Also, that eye framerate trick works. If I look at a CRT TV in the front of my eye, it looks normal, but on the edge the CRT has a blinking + moving line, similar to what a Digital Camera does.
Why not use a high speed slip ring for the data (maybe power too) and optical sensors to determine the drums location? That way, each horizontal line can be triggered based on location of the drum relative to the stand and not by timing.
RIP Alison
Lily Berry I don't think she's dead. ;)
Haha
Mount the pcb on the circumference plane with edge led. Also use the bearings to transmit power so no brushes.
Could you make a fullsize raspberry pi 2 laptop with a cluster/server setup with 2 or more pi's for more computing power?
this reminds me of the time i asked for quesadillas and my assistant brought me case ideas.
Woulder if you could also do wireless power with a qi system?
Heh, you basically re-engineered the old 1982 Entex Adventure Vision display. Instead of moving the LEDs... they mounted them off to the side and bounced thier output off a spinning mirror. Neat project.
How about you make a 8x8x8 RGB LED cube?
That would be great to see.
We don't see in frames, our eyes do not see in frames per second!!!!!!
Why didn't you use a two coils instead of the Brushes?
I would house the spinning part in a clear tube, so I'd have space to build it without having to be bothered by air displacement.
ok, but why use this project that was so recent?
MICROmor maybe it was the one that caused so much hassle and it was annoying him?
Maybe you could make a portable version of the Intel nuc (before comments start rolling in the reason I want to see this and not a laptop is because I want it to be pocket sized) (also with action buttons keyboard and mouse and d-pad)
The Ben Heck show is brought to you by: element 115
Why not use lasers which point on turning mirrors? Then you don't have to turn that much mass, and there is no need for a electrical connection to the turning drum.
The Lasers should shine trough a paper, so it isn't that bright
Our eyes have very... special limitations. The very center of our eye has an amazing refresh rate, but the peripheral vision around the center has much much reduced resolution and refresh rate.
You could use wireless power and couple the data signal onto it eliminating the need for contacts.
Will she be back on cam some day?
We'll miss her...
instead of the brushes just run the positive and ground through the bearings?
Since speed was a critical factor what about considering balancing the LED bracket?
Whoops, I commented to soon. Smitcher already mentioned balancing. Well, in the words Roseanne Roseannadanna "Never mind"
If i look to my crt TV with the corner of the eye sigth I see it Flicker but when I look normal I don't see flicker
wouldn't a clear plastic tube or even a cardboard tube be easier, it already has structure and would be easy to set up to spin.
You could have made the display wireless, possibly using the text radio set you made previously as an input. The motor to spin the display could run off a different power system.
why u just didint used plastic pipe with your PCB inside? drill the holes in the pipe for the lights, it would be easier to connect, lighter and etc.
Hey I'm building an Emulation Station using the raspberry pi b+. I will be installing it into the housing of an NES and hoping to use the original power switch from the NES to power on/off the Pi. I've looked everywhere trying to find a how to video or even a web page on how to do this but I can't seem to find anything in detail. Can anyone help me out here? If it all possible is love for the red LED in the NES to function the same it would normally.
Perhaps you would have better luck asking on the community? ow.ly/Jg4ah
reynex90 The google fu in you must be weak. Go, train and get better at google.
jamesparsons.com/2013/11/raspberry-nes-project
By the way, I hope you are using a broken NES. It really digs under my skin when people take perfectly good working retro gear and destroy it, just my opinion. Plenty of broken ones on ebay.
John Doe Thanks for the link. I googled it a few times and never found an in detail page. And yes i'm using a broken NES.
reynex90 No worries, hope your project goes well.
a 3d tv is 120hz as its displaying 2x 60hz aka 60fps per eye/frame for each eye.
What is the future of POV technology? Must be the closest thing we have to volumetric holograms for displaying 3D models.
i doubt the 100 frames pr second theory. sure you say most 3d tv play at 120 frames pr second, but this is due to it changing the image 120 times a second, and the 3d effect is done using half of the frames in one shade, and the other 60 in another, which is why 3d glasses are needed. and why they are in two different shades of black, to allow the visual from one eye, to primarily be seen by that eye, and not the other, so im guessing more around 150 fps, pr eye, of course this is only speculation. but seing as someone(linus tech tips display rate challange or something, cant remember right now) can differetiate between 60, 120 and 240 fps, it has to be greater than 120, but i still doubt its more than 200.
Why is Alison leaving?
The first bit wasn't staged at all. Lol love your show
what about xbox1 and ps4 windows laptop and Mac laptop and tv
I would make larger balanced PCB with edge mounted smd leds, and encapsulate that in clear acrylic pipe and use something like headphone jack as a brush connector and axle shaft in the ends.
Probably not strong enough and with so little surface contact for the electrical parts it would probably wear through. Adafruit makes exactly what is needed with a couple of different wire configurations.
Cliff Hartle
Thats what I meant saying something like (should have said similar to) headphone jack.
Another way could be doing what VCR image drums use, no physical contact but electromagnetic transfer with coil/ferrite setup. Heck, you could use VCR image drum as it is.
You could have powered the system wirelessly, through magnetically coupled coils, thus posing no additional friction to the system.
Use a brushless motor built for hobby grade RC cars , it has so much speed.
Welcome to part:4 for POV Display ! Phhhhhh
Why use brushes. ?
Why not just plug + on left side of the frame and - on right. Just connect wires to metal bolt that you use to hold the frame.
Make an ipad keyboard case as a dock that charges both with one cable
Wait... Alyson is leaving?
Ben, just do the luggage robot 2.0 already.
Nothing about the raspberry pi 2?
Apparently the highest frame rate humans can actually detect a difference between is more like 300fps.
Alyson is leaving the show?
:'(
I thought Alison had left?! :/
The rotating part is obviously unbalenced, tha'ts the main raison of power over-consumption. Doing it ligher is a good idea, but doing it balanced is better !
She film the show or not?!
Film is only 24 frames per second, PAL TV is 25fps, NTSC is 30fps. You've way overshot what is really required...
i would have weigh the led pcb und put the same amount weight on the other side of the spinning frame :>
Steampunk isn't "steam" punk if it's missing a steam engine or something like that.
Dat VR bumper sticker do
godbye alyson :(
Should have built it again.
There is something worse
And it really does blow
When a long-running series
Does a cheesy clip show...
What would I have done differently?
Screw power consumption! That's what. :)
Alison. We promise we will be mean to any new assistants. Unless they are awesome. Then sorry bout ya!
Hope the best for you, you were awesome. My daughters and girlfriend liked you a lot.
And of course. Let's just blame Ben! :]
No
i have a great ir idea
Well, this episode wasn't that exciting. Stil good enough for me to watch the whole thing, but somehow I don't appreciate this Rewind & Recap as a standalone episode format. Maybe some comments in the midsection of another video or even better a lessons learned reference in other videos while avoiding doing the same mistake.
You did not need a higher gear ratio! You needed a lower gear ratio!
choice :)
Eyes run at 60 fps
Alyson leaving is no good.
I would've actually known eyes run at 20 Hz
What the heck are you talking about? That's nonsense.
I can't even tell if you're trolling or not.
Ruben Fernandes As in, your eyes see the world at 20 FPS
Noorquacker Ind. You know that's bs, first of all the eye doesn't work like a monitor or camera, it has no "frames", it provides an constant stream of information to the brain, the only speed limitations are the chemical process in the retina and the times it takes for the brain to process it, that's why you can "feel" an slight drop and difference even in high fps monitors.
What you mean is the "minimum" fps needed so a sequence of images start to look like an animation and not a slideshow, and btw, that's anywhere from 16 to 24 FPS/hz, motion blur also helps thats why movies look smoother at 24 fps than games at 30 fps
Ruben Fernandes Well, I did learn the eye sends pictures to your brain at around 20 whatchamacallits, and I was needing a word for that.
Noorquacker Ind. Your eyes only send information to your brain if it changes. They don't see in "frames per second", hence why most people see obvious differences between 24fps, 30fps, 48fps 60fps, 120fps, 144fps, etc., etc. If our eyes were limited to something as low as 20 FPS - even hypothetically - then that wouldn't be the case.
build a drone!
so contrived :S
You should always offend steampunkers that just glue stuff to stuff. They made steampunk into a junkpunk.
2nd comment
wtf is this?
First
Nope
Because matzegamer is first
*Extremely* badly acted "conversation" → Downvote