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Signal Cross Talk
Picture this: you’re in the lab at 3 am and you’re trying to figure why your Arduino code is stopping your stepper motor without hitting the limit switch. You measure the signal with a multi meter and can see no sign of the the signal being pulled high. You switch from using the internal pull…
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Biquad IIR Filter Design Tool in Octave
The Infinite Impulse Response (IIR) biquad filter is a simple to implement digital filter while allowing the modification of any signal in a variety of strategic ways. These filters can be then cascaded allowing further control of the resulting output. It should be noted that the coefficients a and b are swapped compared to those…
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Configuring Home Assistant to Monitor Nebra Hotspot Status
This post will go over how to create a dashboard similar to the one shown in Figure 1. Some features shown on this dashboard are not possible without some additional hardware or external configuration: power usage/cycling and Nebra Dashboard Page. Due to this I will not be covering these in this blog post. This tutorial…
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How To: Enable Local SSH Access to Nebra Hotspot
Have you noticed that the Nebra Helium Hotspot is accepting connections from port 22222 (easyengine) but when you try to connect to it with ssh it complains about not having a valid key? Well in this tutorial I will show you how to add a public ssh key to allow local ssh access. Prerequisites: Micro…
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Octave example for square wave creation
Did you know square waves as we know them are generated by summing a series of sine waves? In this blog I will provide a little square wave example written in octave. Worth nothing the peak of the dominant wave is larger than the peak of the square wave. To get a more perfect square…
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Buff Point Beach abandoned boats
https://maps.app.goo.gl/EsE4gDYUnYZd8nps5
