[HN Gopher] Show HN: Wireless video streaming on POV bike display
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Show HN: Wireless video streaming on POV bike display
It took me a few years of fits and starts but I've finally got my
DIY persistence of vision bike light to display video! I designed
and built the PCB for it and wrote the code for the wifi streaming
of video frames with a bit of help from Claude. This was actually
one thing I was dreading as I was hitting a wall being burned out
on this project. With a little bit of Claude's help in getting the
ESP32 wifi stack working It's finally finished! Some tech specs:
Using an ESP32 42 LED's per strip, 4 strips total spaced 90 deg
apart. Angular resolution of the image is 1 deg so it updates all
168 LED's , 360 times per rotation. The LED's are SK9822
individually addressable LED's (also known as DotStar from
Adafruit). Uses a magnet and hall effect sensor to keep track of
rotation speed. The server can be run from a phone and using
termux with a python server to serve locally to the esp. I need to
periodically spin it up every time it slows down. My video camera
shutter speed needs to be slow to show the correct effect otherwise
it is either incomplete or it shows too many "frames" in a video
frame. Gonna get around to making a blog post at some point to
talk more about it in detail!
Author : polishdude20
Score : 28 points
Date : 2025-02-27 20:39 UTC (2 hours ago)
(HTM) web link (www.youtube.com)
(TXT) w3m dump (www.youtube.com)
| Gys wrote:
| Amazing! Do I understand this correctly: the leds are on the
| wheel, so you can ride your bike in the dark and show (for
| example) a tiktok video?
| polishdude20 wrote:
| That's right! Although you'd need to have the video clip as a
| file on your phone rather than just a link to it.
| Gys wrote:
| You should consider selling this as a kit or something? There
| must be some people in Northern Europe who love this!
| tweetle_beetle wrote:
| A company called MonkeyLectric did make a quality
| commercial product for displaying video, but it retailed
| for around $900 so I suspect they didn't sell too many and
| they seem to have shut down. There seems to be stuck off
| their cheaper simpler models floating around still.
|
| This demo looks like it's been achieved with cheap
| commodity hardware which is cool, but I suspect it's pretty
| heavy and awkward.
|
| https://www.kickstarter.com/projects/minimonkey/monkey-
| light...
| gpm wrote:
| This is great!
|
| How many rpm do you need to make it look reasonably good in
| person?
| ge96 wrote:
| So funny the hand spinning, thought it was an e-bike but nvm
| nirav72 wrote:
| This is neat. Are you using some kind of slipring to pass the
| signal to the LEDs?
| nubinetwork wrote:
| Okay that was not what I was thinking of when I read the title,
| but that's an interesting take on the mechanical tv colour wheel
| concept...
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(page generated 2025-02-27 23:00 UTC)