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Daniel Mangum

@danielmangum.com

780 followers 240 following 1.2K posts

big fan of computers and human beings.

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Daniel Mangum @danielmangum.com · Nov 24

**This Website is Hosted on Bluesky**

This weekend I found myself digging through the AT Protocol specifications and the Bluesky Personal Data Server (PDS) implementation. In doing so, I discovered that I could setup a website that is fully hosted on Bluesky.

danielmangum.com/posts/this-w...

Screenshot of the rendered HTML of the website I was able to host on Bluesky.

Daniel Mangum @danielmangum.com · 1d

just used the new AirPods Pro 3 for the first time on a flight and wow it’ll really make you appreciate how much the ANC has improved.

Daniel Mangum @danielmangum.com · 1d

let’s build something great this week!

Daniel Mangum @danielmangum.com · 3d

Congrats to everyone running the Chicago Marathon tomorrow — you’ve already done the work, now you just get to enjoy one of the greatest races in the world!

Daniel Mangum @danielmangum.com · 4d

fridays are for demos!

Reposted by Daniel Mangum

Daniel Mangum @danielmangum.com · 5d

**Using a Laptop as an HDMI Monitor for an SBC**

Wrote up some quick notes on how I use HDMI to USB capture cards to breathe new life into old laptops as HDMI monitors for my single board computers (SBCs).

danielmangum.com/posts/laptop...

Raspberry Pi boot logs shown in VLC media player on an old laptop.

Daniel Mangum @danielmangum.com · 5d

To be clear, the original post is not an endorsement of barrel connectors. Rather, I had just collected 9 12v wall warts from around my office, and none of them fit the the receptacle for the board I was using 😅

Daniel Mangum @danielmangum.com · 5d

Fair. Were you using a laptop charger with the camera?

Daniel Mangum @danielmangum.com · 5d

barrel connectors are like the opposite of USB-C: tons of different form factors but if it fits it is probably going to work.

Daniel Mangum @danielmangum.com · 5d

**Using a Laptop as an HDMI Monitor for an SBC**

Wrote up some quick notes on how I use HDMI to USB capture cards to breathe new life into old laptops as HDMI monitors for my single board computers (SBCs).

danielmangum.com/posts/laptop...

Raspberry Pi boot logs shown in VLC media player on an old laptop.

Daniel Mangum @danielmangum.com · 8d

let’s build something great this week!

Daniel Mangum @danielmangum.com · 10d

Long term goal is detecting gluten cross-contamination in food. Short term goal is to see what this little AS7263 is capable of :)

Daniel Mangum @danielmangum.com · 10d

NIR spectroscopy can be used to perform non-invasive molecular analysis of a wide variety of substances. I’m particularly interested in detection of gluten cross-contamination in food, which I suspect will be a tall task for the AS7263, so first steps are just testing out its capabilities.

Daniel Mangum @danielmangum.com · 10d

new hardware day!

AMS AS726x Near Infrared Spectral Sensor breakout board from Sparkfun.

Daniel Mangum @danielmangum.com · 11d

fridays are for demos!

Daniel Mangum @danielmangum.com · 15d

let’s build something great this week!

Daniel Mangum @danielmangum.com · 16d

I recently learned about Princess Cruises Medallions because I was traveling through a port city and a quick scan of BLE devices revealed that the airport was teeming with them. Interesting little beacon device that appears to be used for everything from unlocking your room to paying for food.

BLE info for the Princess Cruises Medallion.

Description of Medallion on Princess Cruises website.

Daniel Mangum @danielmangum.com · 17d

Currently reading the Feynman Lectures on Physics while on a short vacation this weekend — we should all strive to communicate technical concepts so effectively.

10−8 cm is called an angstrom (just as another name), so we say they are 1 or 2 angstroms (Å) in radius. Another way to remember their size is this: if an apple is magnified to the size of the earth, then the atoms in the apple are approximately the size of the original apple.

Daniel Mangum @danielmangum.com · 19d

today was a good day.

Close up picture of Mt. Rainier.

Daniel Mangum @danielmangum.com · 19d

pacific time is nightmare fuel for morning people.

Daniel Mangum @danielmangum.com · 22d

let’s build something great this week!

Daniel Mangum @danielmangum.com · 25d

fridays are for demos!

Daniel Mangum @danielmangum.com · 25d

never lose the joy of engineering.

Reposted by Daniel Mangum

Daniel Mangum @danielmangum.com · 28d

In addition to signed URL support, we have also released signy, an open source firmware library for generating signed URLs on embedded devices. signy leverages the Arm PSA Crypto API for all signing operations, ensuring private keys remain in secure storage.

github.com/golioth/signy

GitHub - golioth/signy: Signed URLs for small devices.

Signed URLs for small devices. Contribute to golioth/signy development by creating an account on GitHub.

Reposted by Daniel Mangum

Daniel Mangum @danielmangum.com · 28d

Today we are launching support for device signed URLs on @golioth.io! Almost everyone uses signed URLs on a daily basis to access private content on CDNs, but they can also be useful in the context of complex multi-protocol embedded devices.

Read more: blog.golioth.io/signed-urls-...

Diagram showing the use of signed URLs on an embedded device with multiple MCUs but long-lived credentials stored in a single secure location.

Daniel Mangum @danielmangum.com · 28d

In addition to signed URL support, we have also released signy, an open source firmware library for generating signed URLs on embedded devices. signy leverages the Arm PSA Crypto API for all signing operations, ensuring private keys remain in secure storage.

github.com/golioth/signy

GitHub - golioth/signy: Signed URLs for small devices.

Signed URLs for small devices. Contribute to golioth/signy development by creating an account on GitHub.