The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Hardware Development’ Category

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APC SmartUPS Battery Float Voltage Calibration

Posted by jpluimers on 2023/07/19

For my link archive: [Wayback/Archive] APC SmartUPS Battery Float Voltage Calibration

It is my understanding that older BackUPS units could be adjusted with a potentiometer on the board. Calibration of newer models, and the SmartUPS line is factory set in the unit’s micro-controller. APC is of no assistance with units that are out of warranty. I’ve recently found information of how to recalibrate the battery float voltage through reprogramming the battery gain, and some information about modifying the UPS hardware, described below. I can’t take credit for discovering methods demonstrated, but hope it will be useful to another to have a coherent description.

Via:

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Posted in APC Smart-UPS, Development, Hardware Development, Power User, UPS | Leave a Comment »

An unexpected turn of events when Jeff Geerling posted “I’m hosting my website on a FARM!”

Posted by jpluimers on 2023/07/06

Some links on the unexpected turn of events after [Archive] Jeff Geerling (@geerlingguy) / Twitter posted

First his site got more traffic because of the post, then within an hour traffic exploded because of a DDoS overflowing both his Raspberry Pi cluster and his mobile data capacity.

Jeff will likely do blog posts on these and update the underlying GitHub repository at [Wayback/Archive] geerlingguy/turing-pi-2-cluster: Turing Pi 2 Cluster , but until then (since his Tweets were not threaded), this is what happened on 20220209 as it taught me a few bits:

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Posted in Cloud, Cloudflare, Containers, Development, Docker, Hardware Development, Infrastructure, Internet, Kubernetes (k8n), LifeHacker, OpenSpeedTest, Power User, Raspberry Pi, SpeedTest | Leave a Comment »

Dutch thread: improving a cheap T-962 reflow-oven to have more sensors, be earthed, and become more robust

Posted by jpluimers on 2023/06/13

Nice Dutch thread: [Archive] Dinsdale. – D💉ane Blijf thuis ⭕️ on Twitter: “Morgen een leuk projectje. Ik heb dit goedkope reflow-oventje. Heb uitgevogeld hoe ik de firmware kan flashen. De interface kan ik op Chinees of Engels zetten. Tevens heeft de nieuwe firmware meer mogelijkheden. ” / Twitter

It is similar to [Wayback/Archive] Improving The T-962 Reflow Oven | Hackaday.

Saved at [Wayback/Archive] Thread by @Dinsdal85174312 on Thread Reader App – Thread Reader App:

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Posted in Development, Hardware Development, Soldering | Leave a Comment »

Some links on measuring CO2 and Volatile Organic Compounds in the air

Posted by jpluimers on 2023/05/02

Some links on measuring these:

I was triggered by some messages in a thread:

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Posted in Development, ESP32, Hardware Development, Hardware Interfacing, IKEA hacks, LifeHacker, Power User | Leave a Comment »

Special cartridges with heat-shrink tubing for dymo and brother label writers

Posted by jpluimers on 2023/04/26

Labeling cables is important, especially when you have a lot of them, and it is tough:

  1. Paper and plastic tables tend to loosen over time.
  2. Numbers or letters you can snap on only work on thicker cables and over time tend to break loose (due to plasticisers evaporating).
  3. Permanent markers are less permanent and fade over time.

Hopefully heat-shrink tubing you can print on with either Dymo or Brother laber writers will outlast 3. At least they won’t loosen like 2. and 1.

So I was glad that [Archive] Jilles🏳️‍🌈 (@jilles_com) / Twitter started a thread, which I tried to help keeping coherent.

Some of the messages:

 

–jeroen

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Posted in Development, Hardware Development, Hardware Interfacing | Leave a Comment »

Kevin Lewis (he/him) on Twitter: “Wow thanks for all the support folks! I’ve been working on this project today: larger font, options for single/group captioning powered by @DeepgramAI, and a static badge mode as suggested by @bitandbang https://t.co/FBELwDsD4V” / Twitter

Posted by jpluimers on 2023/04/25

Wow, just wow: [Archive] Kevin Lewis (he/him) on Twitter: “Wow thanks for all the support folks! I’ve been working on this project today: larger font, options for single/group captioning powered by @DeepgramAI, and a static badge mode as suggested by @bitandbang https://t.co/FBELwDsD4V” / Twitter

Via [Archive] Jilles🏳️‍🌈 on Twitter: “Love it and worried about it at the same time.” / Twitter

–jeroen

Posted in Development, Hardware Development, Hardware Interfacing, Software Development | Leave a Comment »

The fundamentals of programming, a thread by @isotopp on Twitter

Posted by jpluimers on 2023/03/22

Kristian Kohntöpp publishes great DevOps related threads on Twitter. [Wayback/Archive] Thread by @isotopp “I am Kris, and I am 53 now. I learned programming on a Commodore 64 in 1983. My first real programming language (because C64 isn’t one) was 6502 assembler, forwards and backwards. “ is his response, about a year and a half ago, to a request by Julia Evans (@b0rk) that I also saved: [Wayback/Archive] Thread by @b0rk on Thread Reader App – Thread Reader App.

Her request: [Archive] 🔎Julia Evans🔍 on Twitter: “if you’ve been working in computing for > 15 years — are there fundamentals that you learned “on the job” 15 years ago that you think most people aren’t learning on the job today? (I’m thinking about how for example nobody has ever paid me to write C code)” / Twitter followed by [Archive] 🔎Julia Evans🔍 on Twitter: “I’m especially interested in topics that are still relevant today (like C programming) but are just harder to pick up at work now than they used to be” / Twitter.

The start of his thread is [Archive] Kris on Twitter: “@b0rk I am Kris, and I am 53 now. I learned programming on a Commodore 64 in 1983. My first real programming language (because C64 isn’t one) was 6502 assembler, forwards and backwards.” / Twitter.

Kristian’s story is very similar to mine, though I sooner stepped up the structured programming language ladder as at high school, I had access to an Apple //e with a Z80 card (yes, the SoftCard), so could run CP/M with Turbo Pascal 1.0 (later 2.0 and 3.0) which I partly described in The calculators that got me into programming (via: calculators : Algorithms for the masses – julian m bucknall), followed by early access at the close by university to PC’s running on 8086 and up. The computer science lab, now called Snellius, but back then known as CRI for Centraal RekenInstituut – is now had an educational deal with IBM, which means they switched from the PC/XT to the PC/AT with a 80286 processor as soon as the latter came out).

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Posted in 6502 Assembly, Assembly Language, Development, ESP32, ESP8266, Software Development, x86 | Leave a Comment »

My little tray with neodymium magnets for holding little screws while servicing equipment 

Posted by jpluimers on 2023/03/09

From an interesting thread where Iris Classon had laptop overheating problems (just like I had with a 2015 Retin MacBook Pro in Cleaning the cooling fans of a 15-inch Retina MacBook Pro 2015 model):

My tray is from the lid of a broken container.

I love repurposing the remains of old household items..

The actual problem: dust, just like my MacBook had.

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Posted in Development, DIY, Hardware Development, LifeHacker, Power User | Leave a Comment »

2021 Hackaday Remoticon – links to conference, playbacks and some slide decks

Posted by jpluimers on 2023/01/04

Another remote conference I missed while recovering from rectum cancer treatment, but luckily the playbacks are on YouTube and some slide decks are at Google Drive.

Via: [Archive] Uri Shaked on Twitter: “My talk on @hackaday Remoticon starting now Reverse Engineering the ESP32 WiFi Live stream: … “ / [Archive] Jeroen Wiert Pluimers on Twitter: “Dang. I copied that one out of the description. All the timestamps there are corrupted as YouTube measures them in minutes:seconds but @hackaday posted them as hours:minutes (which are off by minutes anyway) starting at 01:56:30. This is the correct one: … “

Links:

  • Web site at [Wayback/Archive] 2021 Hackaday Remoticon
  • Videos at [Wayback/Archive] HACKADAY – YouTube:
    • Day 1: [Wayback/Archive] 2021 Hackaday Remoticon: Friday – YouTube

      Approximate hour:minute time stamps as published for Friday

      They are usually at least minutes off; substract 11:00 to get the rough hour:minute index into the video, then scroll from there.

      • 11:00 Opening Remarks
      • 11:10 Keynote – Elecia White: Map Files and Other Buried Treasures
      • 12:10 Maurits Fennis: Hack for the Planet: Reverse Engineering Embedded Systems to Reduce E-Waste
      • 13:00 Matt Venn: Open Source ASICs – A Year in Perspective
      • 13:35 Hal Rodriguez and Sahrye Cohen: Conductive Melody: a Tech Couture Instrument
      • 14:10 Jay Bowles: A Dip Into The Plasmaverse
      • 15:00 Voja Antonic: Become a Hardware Expert in 40 Minutes
      • 15:50 Sergiy Nesterenko: Don’t Flip My Bits: Electronics in Spaaaace
      • 16:25 Jeroen Domburg: Rickrolling Buddha: A Deep Dive in Reverse Engineering and Thoroughly Pwning an Unknown Chip
      • 17:15 Lewin Day: Hacker Trivia (Stream will automatically redirect to this one: [Wayback/Archive] youtu.be/uRpUdQi31tg )
      • 18:00 Bring-a-Hack on Gather Town platform (details on joining sent to ticket holders and on the Discord server)
    • Day 2: [Wayback/Archive] 2021 Hackaday Remoticon: Saturday – YouTube

      Approximate hour:minute time stamps as published for Saturday

      They are usually at least minutes off; substract 10:00 to get the rough hour:minute index into the video, then scroll from there.

      • 10:00 Opening Remarks
      • 10:10 Keynote – Keith Thorne: LIGO: The Most Sensitive Instrument Humans Ever Created Will Unfold the Mysteries of Gravitational Waves
      • 11:10 Arsenijs Picugins: Laptop-Be-Done
      • 12:00 Uri Shaked: Reverse Engineering the ESP32 WiFi
      • 12:35 Hash Salehi: Smart Meter Hacking
      • 13:10 Jay Doscher: Getting Started With and Outgrowing Tinkercad
      • 14:00 Joey Castillo: Teaching An Old LCD New Tricks
      • 14:35 Colin O’Flynn: Upskilling your Hardware Security Work
      • 15:10 Rob Weinstein: Patently Obvious – Reverse Engineering a 45 Year Old Patent into a Fully-Functional HP-35 Replica
      • 16:00 Debra Ansell: Form is Function: Modular PCB Building Blocks
      • 16:35 Vaibhav Chhabra: M19 Initiative – A Case of Open Innovation & Distributed Manufacturing at Scale
      • 17:25 Keynote – Jeremy Fielding: Building Hardware that Moves: the Fundamentals that Everyone Should Know
      • 18:25 Hackaday Prize Ceremony
      • 19:25 Closing Remarks
      • 19:35 DJ Jackalope: Live Set (listen/watch on Twitch, chat with everyone on discord)

–jeroen

Posted in Conferences, Development, ESP32, Event, Hardware Development, Remoticon, Software Development | Leave a Comment »

Chris Bensen on Raspberry Pi and clusters

Posted by jpluimers on 2022/12/29

Oracle’s Pi Supercomputer

Oracle’s Pi Supercomputer ; click on the image for a larger version.

In 2019 ans 2020, [Archive] Chris Bensen and his [Archive] Oracle Groundbreakers team built a really large Raspberry Pi cluster of more than 1k pies, all network booting to become a cluster. It was for instance covered in the [Wayback/Archive] Building the World’s Largest Raspberry Pi Cluster – DZone IoT.

On his [Wayback/Archive] personal blog, he wrote a few posts like [Wayback/Archive] Chris Bensen: Raspberry Pi Overlay Root Filesystem and [Wayback/Archive] Chris Bensen: Get MAC Address for a Pi Cluster.

It made me also bump into [Wayback/Archive] Building the world’s largest Raspberry Pi cluster early 2020,

Since that wast right after the start of my rectum cancer treatment which lasted longer and, because of I got metastases a few months after radiation treatment, required more treatments than anticipated, I put a note in my bog drafts and kind of lost track.

So I was glad that in fall 2021, I bumped into the draft and found an almost year old post [Wayback/Archive] Chris Bensen: All Raspberry Pi Super Computer Posts in One Spot which is an index in all the blog posts and videos that Chris and his team produced on this project.

I then also learned the cluster had been shown on [Wayback/Archive] Oracle OpenWorld 2019, Breakthrough Starts Here and was covered in the [Archive] Top 10 Raspberry Pi Projects of 2019 | Tom’s Hardware (where I got the [Wayback/Archive] Oracle World 2019 having the 1k+ node Raspberry Pi cluster on display picture shown on the right from).

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Posted in *nix, Development, Hardware Development, Linux, OracleLinux, Power User, Raspberry Pi | Leave a Comment »

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