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Ask HN: What do you do with your Raspberry Pi?

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Re: Ask HN: What do you do with your Raspberry Pi?

#821

Post by Quequau »

mad_tortoise wrote: post #812
Quequau wrote: post #770

I have a few Raspberry Pi boards and since I've seen folks doing stuff similar to what mostly do I thought I comment on something I hadn't seen yet. I struggle with tinnitus distress and Ménière's. One of my coping strategies is to continuously play some sort of background sound in the areas I occupy. I have a first gen RPi with a set of USB powered speakers in my bedroom that plays long form background soundscapes I…

As someone newly with tinnitus, and with fading hope that it will go away at some point, I've been playing around with ideas of doing something like this. I was thinking of using frequencies to cancel each other out, but I think this might work much better.

I don't think that it's possible to use certain frequencies to 'cancel out' the perception of tinnitus because for the over whelming majority of folks dealing tinnitus the noise isn't a real sound.

Re: Ask HN: What do you do with your Raspberry Pi?

#822

Post by tnasemelward »

I started a company that constructed booths which used 70 accurately sync'd Pis with custom PiCams (fitted with lenses) to take pictures of human subjects, for turning them into avatars like this: https://maintenancearistonalex.blogspot.com/2019/06/blog-pos...

At the beginning of the project, I'd barely powered up the Pis I had collecting dust in my drawer. By the end, I was a legitimate domain expert in several niches within niches of Pi dark arts. For example, since Pis do not have hardware clocks, you have to rely on NTP. However, you need to take pains to make sure that each Pi is getting the same amount of voltage or else they will run at different speeds. If you want to power 70 Pis in a constrained space, you need to devise a customized power distribution system with adequate heat venting.

https://indesitmaintenance.blogspot.com/2019/06/blog-post.ht...

Due to the thin effect, voltage drops over distance, so the distance a Pi was from the power would impact the voltage and therefore the speed. The major breakthrough came when I realized that I could start with a high end power supply outputting 14 volts and terminate each parallel line with a device known as a UBEC. They are used primarily by drone enthusiasts to make efficient use of battery packs.

A UBEC is designed to drop down a supply voltage to 5v without bleeding off the excess voltage as heat. Since this could also describe a fuse, we felt comfortable bypassing the Pi's MicroUSB power supply and attaching the UBEC's pins directly to the top pins on the Pi's GPIO breakout.

That's just a tiny example of the hijinx. The Pi is an incredible tool if you're patient and clever.

What a rollercoaster.

Re: Ask HN: What do you do with your Raspberry Pi?

#823

Post by gchokov »

bArray wrote: post #739

Our Raspberry Pi 3 B is the core processing unit for our humanoid robotics platform [1]. This is in the context of the RoboCup competition [2]. With it we run: * Vision - A custom CNN using YOLO [3], where we are able to process a 256x256 (input is scaled) at 10fps to detect bounding boxes for balls and goal posts * Localization - Kalman filter (mainly currently used for tracking rotation) * Networking - Game control…

A+ for effort

Re: Ask HN: What do you do with your Raspberry Pi?

#824

Post by kylegordon »

Pi Zero running a digital picture frame that I made from a discarded 17" laptop screen

Pi 3B running adsb-receiver and feeding flight data into Flightaware, ADSB-Exchange, ADSBHub, FlightRadar24.

Pi B Rev 1 running node-red with a Jeenode decoding weather station data from my weather station. Sends data over MQTT to Home-Assistant.

I have a BananaPi M2 Zero running Armbian and doing nothing at the moment. It's likely going to be put in a box close to the ADSB antenna and take over ADSB duties in order to free up the 3B for AIY/Snips.ai experimenting.

Re: Ask HN: What do you do with your Raspberry Pi?

#825

Post by gchokov »

NickBusey wrote: post #210
kageneko wrote: post #44

I'm building a CarPi. I'm using a bluetooth OBD-II adapter and Python-OBD to monitor my car's diagnostics and record them. I'm planning on adding a GPS adapter and probably a gyroscope/accelerometer so I can track location and motion at the same time. It's mostly just for fun. Maybe one day I'll add some kind of analysis to it. It might be interesting to track location, motion, and car status in order to predict mile…

Please open source this.

Please do

Re: Ask HN: What do you do with your Raspberry Pi?

#826

Post by mr_mitm »

I use one with an extra wifi card as a wireless router. I'm living in hotels a lot and sometimes I find their wifi too restrictive. The built-in wifi card connects to the hotel wifi and the external wifi card acts as an access point to which all my other devices connect to. This way I only need to pass the captive portal once (and only pay for one device ...) and I can enable a VPN to my home router in case I want to use Netflix or Amazon Prime in a foreign country.

Another raspberry pi I turned into a listening device to analyze and modify traffic. I call it Lauschgerät: https://github.com/SySS-Research/Lauschgeraet

Re: Ask HN: What do you do with your Raspberry Pi?

#827

Post by trollsund »

sequoia wrote: post #374

I run a plex media server on my 3b+. The server is on the wall below my router (attached via ethernet), a 2TB HDD sits next to the server. I put movies & TV for my kids on the server, then they can watch on one of two TVs in the house via Roku. It's good for getting them off trashy Netflix movies & making classics (or what I consider classics at least) available to them. I chose this configuration rather than running…

Have you thought about trying this with a RPI 4B? Thinking about replacing my 3b+ providing two SMB shares with such a setup, once 4b has matured a little.

Re: Ask HN: What do you do with your Raspberry Pi?

#828

Post by alvern »

I've bought every board that comes out since the 2B. Most of them get gifted to relatives as Kodi boxes. The three I currently use are a 3B that runs the [0] LivPi CO2 and environment monitor, a zero W that has a noIR camera pointing at my plants under lights, and a 2B+ that runs piHole.

I recommend the odroid [1] XU4 (desktop) or [2] HC1 (nas) if you have anything that requires constant read writes. Pi SD cards do go bad over time unless you set it to run the OS from memory. Odroid made a smarter choice going with eMMC early on. The con of odroid is you have to hack everything that was already done on a pi to work.

[0] http://www.livpi.com/

[1] https://www.hardkernel.com/shop/odroid-xu4-special-price/

[2] https://www.hardkernel.com/shop/odroid-hc1-home-cloud-one/

Re: Ask HN: What do you do with your Raspberry Pi?

#830

Post by ryanmercer »

strags wrote: post #449

I discovered that my 17-month old son loves to mess with stereo controls. So I bought a few rotary encoders and neo-pixel rings - build a wooden enclosure with a plastic faceplate, and wrote some code to generate fancy light and audio effects when he turns/clicks the knobs. He loves it.

Tread carefully, you're creating a young Look Mum No Computer! https://www.youtube.com/channel/UCafxR2HWJRmMfSdyZXvZMTw
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