Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

I built a ceiling projection mapping of the planes flying over my house

old.reddit.com

Post reply on HN
Print view View original

31–36 of 36 posts

Re: I built a ceiling projection mapping of the planes flying over my house

#31

Post by ryandrake »

ProllyInfamous wrote: post #30
ryandrake wrote: post #15

Earlier quoted context omitted.

I've got a Raspberry Pi 2b I've been using for probably close to a decade, with two SDRs hanging off it, pulling aircraft ADS-B locations and VHF radio transmissions out of the sky. It's a great application for this platform. ADS-B scanner averages about 25% CPU and the VHF airband receiver averages about 17% (uses hardware FFT).

Thanks for the percentages – let's me know that a PiHole can co-pilot as an SDR tracker. Which do you use (via USB, I suspect..)? I'mma slap a cheap LCD on (instead of projecting onto ceiling) and make it look like the arrival screen you'd see behind an airport kiosk (and broadcast the VHF/tower). This is a perfect front porch project (to encourage neighborhood curiosities).

Two separate USB RTL-SDR dongles. Very important if you do two receivers: Make sure you have an official Raspberry Pi 2b charger that outputs enough wattage. Cheesy bargain bin power supplies you get on Amazon are not up to the task of powering the Pi + 2 radios, and they will not work. Get some good airflow around the radios too, because they can get a bit hot.

Re: I built a ceiling projection mapping of the planes flying over my house

#32

Post by DoneWithAllThat »

Abh1Works wrote: post #26
DoneWithAllThat wrote: post #23

Random aside: there’s a restaurant in San Diego on the SAN flight path with a split flap display over the bar. Every time a flight passes over it updates to show flight number and departure airport. It’s quite neat.

Do you remember the name? Would love to visit it

Nolita Hall! Highly recommended.

Re: I built a ceiling projection mapping of the planes flying over my house

#33

Post by m463 »

jasondigitized wrote: post #17
waltbosz wrote: post #11

The repo subtitle is `Project the aircraft passing overhead onto your ceiling, in real time — an X-ray through the roof.` The demo video starts outside pointing at a cloudy sky with an airplane passing overhead. My mind, seeded with the word "x-ray", thought the outside shot was the video projection on his ceiling. I thought his rain gutters were crown molding, and when the camera man runs inside, I thought he was ru…

Thought the same thing. Would be super cool to project the night sky with procedurally generated cellestial objects, planes, spaceships, etc.

maybe during the day use birdnet-pi to project birds.

Re: I built a ceiling projection mapping of the planes flying over my house

#34

Post by srean »

Would have loved a post on working out the geometry of the projection, especially if it accounted for transitions of ceiling to wall. That would be fun.

The surface through which one is projecting is a flat rectangle. Had it been a hemispherical dome one wouldn't have had to do anything special for the transitions.

Re: I built a ceiling projection mapping of the planes flying over my house

#35

Post by ProllyInfamous »

ryandrake wrote: post #31
ProllyInfamous wrote: post #30

Earlier quoted context omitted.

Thanks for the percentages – let's me know that a PiHole can co-pilot as an SDR tracker. Which do you use (via USB, I suspect..)? I'mma slap a cheap LCD on (instead of projecting onto ceiling) and make it look like the arrival screen you'd see behind an airport kiosk (and broadcast the VHF/tower). This is a perfect front porch project (to encourage neighborhood curiosities).

Two separate USB RTL-SDR dongles. Very important if you do two receivers: Make sure you have an official Raspberry Pi 2b charger that outputs enough wattage. Cheesy bargain bin power supplies you get on Amazon are not up to the task of powering the Pi + 2 radios, and they will not work. Get some good airflow around the radios too, because they can get a bit hot.

I've been really disappointed with the Cannakit power adapters which came bundled with my 3b+ units (four, total). They are definitely not able to deliver enough power to even a dongle-less Raspberry – not sure why they were paired together.

All have been replaced with beefier AC/DC bricks. Definitely thanks for the consideration and model reqs.

My own recommendation is to use a powered USB hub, immediately plugged into any Pi (so the Pi's adapter can just worry about powering only CPU board).

Post reply on HN