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OpenSCAD source code: Bike helmet mirror mount with ball clamp
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Today I tried to setup a small Kubernetes cluster on top of 3 Raspberry Pi 4 (4GB Memory).
Here is the steps to install the cluster.
Preparation
I have 3 Raspberry Pi 4 stacked with PoE headers and connected to a PoE switch at home. The are connected to Internet through a home router. All Pis are equipped with a 64GB Samsung SDXC card flushed with Ubuntu 20.04 image.
PPS-GPIO on Rock64 with Armbian legacy (4.4.X) kernel
PPS-GPIO on Rock64 with Armbian legacy (4.4.X) kernel
About
This gist covers how to enable PPS input via GPIO for Rock64 SBCs running Armbian legacy (4.4.X) kernels. It may also be applicable to Pine64 SBCs and other kernel versions but I have not personally tested them.
This gist will not cover configuring ntpd or gpsd to utilize the PPS signal, only enabling pps-gpio via modifying the device tree. For help configuring ntpd or gpsd I recommend the links under Motivation
Motivation
A PPS (Pulse Per Second) signal allows a time server to improve its clock accuracy and therefore achieve Stratum 1 status. Typically a PPS signal is provided via a GPS receiver attached to the server. The GPS receiver also provides a coarse time via USB or serial connection.
A. Schneider, "Real-Time Volumetric Cloudscapes," in GPU Pro 7: Advanced
Rendering Techniques, 2016, pp. 97-127. (Follow up presentations here, and here.)
S. Hillaire, "Physically Based Sky, Atmosphere and Cloud Rendering in Frostbite"
in Physically Based Shading in Theory and Practice course, SIGGRAPH 2016. [video][course notes][scatter integral shadertoy]
[R. Högfeldt, "Convincing Cloud Rendering – An Implementation of Real-Time Dynamic Volumetric Clouds in Frostbite"](https://odr.chalmers.se/hand
Publishing Raspberry Pi image data to Adafruit IO from Python
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Customise OpenFaaS helm chart for Raspberry Pi / ARM
Guide
You can use the OpenFaaS helm chart to generate custom YAML files for your OpenFaaS installation on ARMHF and ARM64.
Why? tiller is not available for ARM so we cannot customize the chart that way.
So instead we ship some defaults for the community which you can then tweak as you see fit.
But what might you want to change?
httpProbe - this is a much faster way to check functions are healthy than the default execProbe
Change your Raspberry Pi scrolling to Natural Scrolling - NEW Bookworm hack!
Bookworm OS (Debian 12)
While this method is indeed a bit hacky, it does work! Perhaps in due course wayfire will make this a bit more straight forward...
🚨 🚨 For some reason wayfire will (occasionally) add back in the <min>0.0</min> line and will also remove the <max>1.0</max> (see Step 2. If you notice natural scroll not working, this is most likely the cause. Just repeat this step and sudo reboot... hey I said it was hacky 🤷🏻♂️