2071
Capturing PAL video with an SDR, and a few dead ends
A blog about signals, programming, music, and other stuff.
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The latest blog posts to take off on Hacker News. 3,046 posts.
Hardware & Electronics
Any year
2072
Apollo Guidance Computer switching power supply works after 50 years
We recently restored an Apollo Guidance Computer, the revolutionary computer that helped navigate to the Moon and land on its surface. 1 At...
2073
Where do interrupts happen?
Trying to determine exactly where asynchronous interrupts are delivered on Intel CPUs.
2074
Building a vacuum tube computer
Having 32 (31) registers, this means that a refresh will be issued each 256us. To be on the safe side, the capacitor should keep its charge much longer than that. Testing with both EAA91 (ideal diode) and some semiconductors: Diode charge hold time Comment EAA91 >500us ideal diode 1N4148 >500us for reference, leakage…
2075
My Home Lab Server with 20 Cores / 40 Threads and 128 GB Memory
Update fall 2024 I have decided to decomission this machine and it is no longer in use.
2076
The “terrible” 3 cent MCU – a short survey of sub $0.10 microcontrollers
Like many others, I was quite amazed to learn about a microcontroller sold for only 0.03 USD via the EEVblog last year. How was this possible? Many assumed this was a fire sale of an old product. D…
2077
Home 3D metal printing: first results
A couple of weeks ago I learnt about an interesting 3d metal printing process , from a company selling it for $100k USD, and speculated that it might be DIY-able for much less. Well I now have some promising first results.
2078
Commodore 900
Click the Commodore icon to return. Intending to use pictures or text from this page? Please read this notice . Last modify 11 August 2020.
2079
Solar Powered Raspberry Pi Camera
https://www.youtube.com/watch?v=M53eJI90ETE Update: this project was featured in issue 92 of the official Raspberry Pi magazine (download as PDF, buy the issue or subscribe). SSH-ing into a remote solar powered Raspberry Pi at the top of an apple tree has a special feeling -- almost like commanding a spaceship where…
2080
How to Measure Indoor Air Quality with a Raspberry Pi, RuuviTags and PMS7003
Learn how to build an air quality monitoring device with a PMS7003 sensor, Raspberry Pi and some Java code. Help raise awareness about air pollution.
2081
A Guide to Recording 660FPS Video on a $6 Raspberry Pi Camera
This article will discuss the setup steps that are required for recording videos at high frame rates on cheap Raspberry Pi cameras. Frame rates up to 660FPS on the V1 camera and up to 1007 on the V2 camera can be achieved. Filming at these extremely high frame rates on a Raspberry Pi is much more challenging and…
2082
Turning a MacBook into a Touchscreen with $1 of Hardware (2018)
We turned a MacBook into a touchscreen using only $1 of hardware and a little bit of computer vision.
2083
Casting Glass from 3D Printed Molds
31 Jul 2019 | self-Amos , glass art , kiln casting , fabrication , kilncasting , lost-resin , lost-wax
2084
2085
Open Source Hardware Hearing Aid Part 1
My mother got hearing aids a few years ago. About a month later, she lost one. Insurance said if she wanted a replacement, she could pay them many thousands of dollars or she could wait a year.
2086
Raspberry Pi Model Railway Automation
This note introduces my experiences of using the Raspberry Pi to automate a model railway.
2087
2088
Raspberry Pi microSD follow-up, SD Association fools me twice?
/ Fool me once, shame on you. Fool me twice, \ \ prepare to die. (Klingon Proverb) / -------------------------------------------- \ ^__^ \ (oo)\_______ (__)\ )\/\ ||----w | || || (Excerpt from Ansible for DevOps, chapter 12.) The fallout from this year's microSD card performance comparison has turned into quite a…
2089
Retro 5″ Black and White TV as a computer monitor – A tale of pointlessness
The convoluted and ultimately pointless tale of how I connected a retro 80s 5" BW TV to my PC as a 3rd monitor
2090
A2-class microSD cards offer no better performance for the Raspberry Pi
Update: See follow-up post about A1 vs A2 performance, Raspberry Pi microSD follow-up, SD Association fools me twice?. After I published my 2019 Raspberry Pi microSD card performance comparison, I received a lot of feedback about newer 'A2' Application Performance class microSD cards, and how they could produce even…
2091
How Computers Boot Up (2008)
The previous post described [motherboards and the memory map] memory-map in Intel computers to set the scene for the initial phases of boot. Booting is an involved, hacky, multi-stage affair - fun st
2092
Adventures Building a Self-Driving RC Car
Having read some amazing books on Machine Learning, I had been looking for opportunities to apply ML from first principles in the real world. That was what got me curious about the wonderful Donkey Car project. The project is essentially a how-to guide to building your own RC car which can drive itself around a track…
2093
Powering a Mainframe
The last few days have been eventful. I was contacted by the datacenter that the mainframe's cage is now ready for moving in, and the power ...
2094
The Raspberry Pi 4 needs a fan
December 2020 Update: Lo and behold, the Pi Foundation tacitly acknowledges the Pi needs a fan in the official case, because now they sell the Case Fan! The Raspberry Pi Foundation's Pi 4 announcement blog post touted the Pi 4 as providing "PC-like level of performance for most users". The Foundation even offers a…
2095
Raspberry Pi microSD card performance comparison
Note: I also posted a separate review of some A2 'Application Performance' class cards, see this post: A2-class microSD cards offer no better performance for the Raspberry Pi. As a part-time tinkerer and full-time developer, I have been fascinated by single board computers (SBCs) since the first Raspberry Pi was…
2096
Rust, a Raspberry Pi and Addressable LEDs
Tom Arrell's blog. Tom is a Software Engineer who writes about programming, embedded and electrical projects, and life.
2097
PCI Express on the Raspberry Pi 4
After the daily dose of Hackaday - and with an idea that seemed very doable, and actually, with some improvements can be easily reproducible.
2098
Bitcoin mining on an Apollo Guidance Computer
We've been restoring an Apollo Guidance Computer 1 . Now that we have the world's only working AGC, I decided to write some code for it. Try...
2099
Running an eInk Display with Elixir, Scenic and Nerves
So I've been curious about what kinds of displays you can connect to the Pi-series single board computers for a while. I happened to accidentally order a few. Among others an eInk display. I ordered the PaPiRus ePaper. It ended up being dead on arrival and then out of stock so I received an Inky to replace it. Fair…
2100
How to design a proper USB-C™ power sink (hint, not the way Raspberry Pi 4 did it)
This issue came up recently for a high profile new gadget that has made the transition from Micro-USB to USB-C in its latest version, the…