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Talking to Dynamixel servos from a NVIDIA Jetson (or other host computer)

It's pretty common, among people who want to talk to Dynamixel servos like the MX-28 or MX-64 or AX-12, to try to use a built-in UART on whatever computer they're using. Raspberry Pi, Odroid, NVIDIA Jetson are just a few common choices. The first thing an engineer will wonder is: "will I break something if I just tie TX and RX together on my UART?"

Actually, tying TX and RX will work fine, as long as you know to receive and discard the bytes you are sending yourself. There are two other problems, though:

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Subjective does not mean arbitrary

In the discussion of compensation, and using subjective judgments by the compensator to the compensee (employee,) one frequent question is "how can subjective evaluation be fair?"

"Subjective" does not mean "arbitrary"

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How to rebuild and flash a kernel for NVIDIA Jetson TX2

I wish this brief overview had been available when I first got my TX2, for how to rebuild a kernel and flash it.

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Some examples of images to classify

The question came up: Why would I go through the trouble of training a neural network, rather than just checking "is the ground in front of me gray-colored?"

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Machine learning and computer vision for autonomous rover racing -- step one

Some interesting news on my project to apply machine vision to the subject of autonomous rover racing.
I've been renting GPU processing power on the GPU processing power spot market (yes, there is such a thing) and training neural networks.

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How to harden a publicly facing server

The question came up: "How would I go about 'Hardening' the host server?"

In theory, hardening is a simple mixture between good configuration, good software, and good operational practice.

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Outline of a Scalable Web Backend

Here's a common question for newcomers to mobile game development, web game development, and similar systems:

How shall I design my application for scalability? And what do you mean by application, for that matter? Do you mean the whole iOS app/PHP/mySql system, or something else?

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Christmas Lights!

Adafruit has some cool, bendable LED strips. You can buy up to 4 meters of them in a continuous strip, with 30, 60, or 144 LEDs per meter. You send the color to each of the LEDs as 24-bit RGB, using a serial bus (single-ended SPI) and a simple protocol.

The protocol for these DotStar LEDs wasn't documented, so I had to figure it out from the sample code. It's pretty easy:

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How do I dependency?

So, if I were to build a brand new OS, not based on Linux kernel necessarily, what should packaging look like?

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Look what I came across

In the distant past, I made an effort to get various virtual world vendors to attempt to interoperate, such that various virtual worlds could be interconnected.
That would have been cool! Unfortunately, the competetive landscape ended up not supporting such an effort.

Here's a copy of the IETF draft that I posted at the time:

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