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About ao2

My name is Antonio Ospite and I am a software developer based in Naples, Italy.


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3D-printed holder for magnetic spheres built with OpenSCAD

When I built the low-cost and precise rotary encoder with magnetic spheres I used 21 spheres because they fitted nicely in the other parts of the build I had around.

However, if an arbitrary number of spheres is to be used then an appropriate holder must be built.


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Linux Device-Tree and gpio-keys driver on BeagleBone Black

I had to wire up a simple navigation keypad to a BeagleBone Black for a prototype, and I used the gpio-keys driver configured via a device tree overlay.


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Tweeper 1.3.0 released, scraping Twitter and Instagram hashtags

Tweeper is a web scraper which converts Twitter and other social media websites to RSS.

On June 6th 2018 version 1.3.0 of Tweeper has been released. The tweeper Debian package has also been updated.


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Low-cost and precise rotary encoder with magnetic spheres

You know what they say that constraints drive creativity, I think this post is just another little example of that.

Usually I do not put time constraints to my hobby projects, but I make sure to have some other kind of constraints, like keeping the cost low and trying to reuse stuff that I already have.

In this case I needed a way to measure the angle and speed of a rotating object for some of my projects, and I wanted a rotary encoder that was inexpensive, but precise enough to work at very low speeds.


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Nftables experiments: ICMPv6, Hop-by-Hop Options header

I experimented a little with nftables, even though it's not clear whether it will ever completely replace iptables, especially after the news about bpfilter, but it was an interesting exercise anyways.

After converting some iptables rules, I looked at how others were using nftables to write a more idiomatic configuration; I found some ruleset for a host firewall, and I tried to add them to my configuration.

When testing those rules I found that some ICMPv6 packets were not being matched as I would have expected.


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Little hacks for a GoPro Hero 3 White

Someone came to me with a broken GoPro Hero 3 White which wasn't turning on anymore, asking if there was a cheap way to fix it.

After tearing it down, a quick inspection revealed that the two flat-flex cables (the Shutter button one and the Power/Mode+LCD one) were both damaged, so neither the buttons or the LCD were working.

However, making contacts on the PCB traces of the Power button resulted in some reaction from the camera, so I knew there was still a chance.


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libam7xxx-0.1.7 released

The libam7xxx-0.1.7 release is out; it's a maintenance release with no big new features.


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Tweeper 1.2.0 released, Instagram locations and Twitter permalinks

Tweeper is a web scraper which converts Twitter and other social media websites to RSS.

On Febrauary 25th 2018 version 1.2.0 of Tweeper has been released. The tweeper Debian package has also been updated.


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Fun with flexagons, and SVG

If you don't know Vihart and her "Hexaflexagon series", go check it out: