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

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

news.ycombinator.com

Post reply on HN
Print view View original

721–730 of 1001 posts

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

#721

Post by jonaswi »

bborud wrote: post #534
jonaswi wrote: post #399

I live in an apartment with quite strict fire-protection standards. Due to the fact that I have a cat that absolutly loves to go outside, I needed to find a solution for him to get outside without a catdoor trough my door. So I installed a fire-protecion-approved door drive that is hooked to a raspberry pi. Another raspberry pi then analyzes a video stream and detects my cat. If my cat is in the frame for n amount of…

Do you have a screengrab of your cat?

Here is a picture of him examining the tech behind his magic door https://i.imgur.com/81VgqaR.png

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

#722

Post by dougmwne »

gwynn wrote: post #622

College student here with a part-time data entry job. I have automated nearly all of it using Python, Selenium, and a few nasty bash scripts called by periodic cronjobs. Recently purchased a 3b+ for the task so that I can travel without worrying about AirBnB wifi speeds. If I need anything I can just SSH or VNC into it from a coffee shop. It just sits next to my router and blinks all day doing my job for me! Best $35…

That's great! The business world is chock full of these situations where non-technical people create a process that could be automated but isn't, eventually leading to an entry level person (or several) who's entire job is to do things like copy-paste, clicky-click or OCR. I think the key step to automating these tasks is to have the ability to both recognize the opportunity for automation and code a solution. There could be a fantastic amount of money in building things like this on the regular.

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

#723

Post by m0nty »

DrAwdeOccarim wrote: post #521

I have an old Raspberry Pi 1 that runs headless raspbian with a set of cheap speakers plugged into it and an old usb wifi adaptor. It has only one purpose: to play a wav file of a telephone ringing for one minute. My spouse does not ever have the ringer on her cell phone. So when I am out and I need her to look at her phone, I VPN in to my home network, ssh into the pi using Terminus on my iphone, and 'aplay' the wav…

> I VPN in to my home network, ssh into the pi using Terminus on my iphone, and 'aplay' the wav file

Once, when I was working away from home, someone unplugged the phone at home so I couldn't phone in. After becoming very frustrated, I SSH'd into my home server, and from there into the Mac Mini we used as a media station. Then:

- checked they were watching something using `ps`.

- killed that process so I had their attention.

- `say 'this is dad, I'm inside the computer.'`

- `say 'I want to phone you but you have unplugged the phone.'`

- `say 'plug it back in'`

Worked :)

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

#724

Post by FullMetalBitch »

I have a Raspberry Pi 3 where I host my personal website including a nextcloud instance, with it I learned more about Linux.

With the release of Raspbian Buster I am currently rebuilding it because it was the first one I bought so there was plenty of residual stuff from when I had no idea what I was doing.

I have a Pi 3b+ I use as a Pi-Hole, samba share and whatever I want to try at the moment. I have to rebuild it after I "finished" with my site.

And I want a Pi 4, or two.

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

#725

Post by sdfjkl »

chris-metcalf wrote: post #405
sdfjkl wrote: post #251

It used to run kplex to bridge NMEA data (wind speed, depth soundings, boat speed, etc.) from our SeaTalk network to TCP/IP. Now a GL-AR300M does the job though, along with all the Wifi/GSM routing, saving one computer and power (when running strictly off solar and batteries, this matters).

Have you by any chance documented how you did this, or could you link me to where you learned how to set this up? This is actually one of the projects I puttered on for a long time with one of my RPis (NMEA-2000 to SignalK) but abandoned because I had too many moving parts.

Been meaning to blog about it, but not got around to it yet. Essentially it's just a (bunch of) USB-serial converters and the Seatalk data is converted by a Raymarine E85001. If you have N2k, you need a different converter, e.g. Actisense or better yet, a translator to NMEA0183, which is the de-facto standard for NMEA over TCP/IP.

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

#727

Post by sandreas »

Karrot_Kream wrote: post #711
sandreas wrote: post #679

I use a Raspberry PI Zero / 3 together with a phat dac for a bluetooth audio receiver / Airplay in my car: Auto-Installer: https://github.com/BaReinhard/Super-Simple-Raspberry-Pi-Audi... PhatDac (hardware): https://www.amazon.com/Pimoroni-24-bit-192KHz-Sound-Raspberr... Alternative (hardware): https://www.amazon.com/Audio-AUDIO-Raspberry-Better-quality/... It can be controlled via buttons over bluez / dbus via infrar…

I don't know anything about Bluetooth. Does bluez always mount devices on /org/bluez/hci0/dev_${DEVICE_NAME} ?

Depending on your device... But for me it works with every audio capable device i tried (iPod nano, iPhone SE, Android Moto G7)

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

#729

Post by elihu »

oddsockmachine wrote: post #370
elihu wrote: post #141

I'm using one as part of a midi controller project: http://jsnow.bootlegether.net/jik/keyboard.html The controller has 156 pressure sensitive keys. The raspberry Pi runs a program that reads from a bank of 20 8-channel ADCs all wired up to a SPI bus (it runs at 2mhz, and I'm able to get about 90 samples per second), and then generates MIDI commands that are sent over a USB-MIDI adapter. I could use a microcontroller…

Thanks for sharing this, it's great to see your process. I'm working on something vaguely related, a grid-based synth-controller/sequencer with a bunch of i2c shift registers and laser cut hardware. I've been thinking about building a pressure-sensitive hex-layout keyboard next, you've given me a bunch of ideas and inspiration.

Thanks. Pressure sensing is actually pretty simple and cheap, unless you have a really large number of inputs (like I have). I was planning to switch to a matrix layout in the next version to reduce the number of ADC chips I need, but then I'll have to figure out how to mitigate ghosting.

I haven't used any of Sensitronic's producs, but they do have a lot of good information on their site about the various ways to use force-sensitive resistors.

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

#730

Post by Tempest1981 »

xmichael999 wrote: post #111

1x House power monitor 1x Solar power monitor 1x DVBT airplane tracking (flightradar.com) 1x Fridge temperature and humidity graphing for Salami chamber 1x Pi-hole (I also run a second pi-hole on a VM)

What sensors for your power monitor?
Post reply on HN