Electronics > Beginners

Recreating a CRT style Radar display with a LED matrix

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rthorntn:
Update: I think this might be a bit OT, sorry about that.

Another update: Maybe the best bet is just to use 0201 LEDs real close together in a grid, like reDOT.

Hi,

I'm thinking of something like this https://www.youtube.com/channel/UCagly25EuaH5Wi1LhxUQNQg but:


* More LEDs - 360 around the circumference
* More like a retro looking oscilloscope or radar screen
* The LEDs much closer together
* Spaced to be able to draw a radial sweep http://www.radartutorial.eu/12.scopes/sc16.en.html
I cant really get my head around whether this is even possible, if I want the radial sweep to be one LED wide (1 degree) at the outside, what do you have to do to the LEDs as you go towards the centre.

I really should have paid more attention in maths.

Thanks for looking.

Cheers
Richard

hendorog:
Reminded me of this:
https://forum.kicad.info/t/python-scripting-example-studio-clock/5387

Which might actually be hackable to do what you want.

Z80:
Draw circles at the led spacing and distribute leds evenly around them.  There will be less on each ring until you reach the centre where there will be 1.  The line obviously won't be perfectly straight but will zig zag with leds being shared between steps, a diffuser over the panel will help smooth it out.  The challenge will be driving it, probably best to put the leds on the top and the drivers on the bottom and either implement the pattern generator locally or if you want other stuff on the screen then use a high speed serial link to the controller.

PA0PBZ:
Can't help to think that a cheap LCD display would be so much easier...

rthorntn:
I don't know of any big round LCDs... but a bit of waste cardboard, compass, protractor and a scalpel could fix that.

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