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Author Archives: Al Williams

Reverse Engineering a (Toy) Fire Engine

Posted on September 7, 2025 by Al Williams

Your kid has a toy remote control fire truck. You have an RTL SDR. See where this is going? [Jacob] couldn’t resist tearing into the why and how of the …read more Continue reading Reverse Engineering a (Toy) Fire Engine→

Posted in gnu radio, radio hacks, Reverse-engineering, RTL-SDR, wireless hacks

Faux Potentiometers Use Magnets, No Contacts

Posted on September 6, 2025 by Al Williams

Ever tear open a potentiometer? If you haven’t, you can still probably guess what’s inside. A streak of resistive material with some kind of contact that moves across it as …read more Continue reading Faux Potentiometers Use Magnets, No Contacts→

Posted in magnetic rotary encoder, parts, rotary encoder

Heart Rate Monitoring via WiFi

Posted on September 5, 2025 by Al Williams

Before you decide to click away, thinking we’re talking about some heart rate monitor that connects to a display using WiFi, wait! Pulse-Fi is a system that monitors heart rate …read more Continue reading Heart Rate Monitoring via WiFi→

Posted in heart rate, Science, wifi, wireless hacks

Tips for Homebrewing Inductors

Posted on September 4, 2025 by Al Williams

How hard can it be to create your own inductors? Get a wire. Coil it up. Right? Well, the devil is definitely in the details, and [Nick] wants to share …read more Continue reading Tips for Homebrewing Inductors→

Posted in diy inductor, inductor, misc hacks

Optimizing VLF Antennas

Posted on September 4, 2025 by Al Williams

Using digital techniques has caused a resurgence of interest in VLF — very low frequency — radio. Thanks to software-defined radio, you no longer need huge coils. However, you still …read more Continue reading Optimizing VLF Antennas→

Posted in loop antenna, radio hacks, vlf | Tagged Antenna

CPU Utilization Not as Easy as It Sounds

Posted on September 4, 2025 by Al Williams

If you ever develop an embedded system in a corporate environment, someone will probably tell you that you can only use 80% of the CPU or some other made-up number. …read more Continue reading CPU Utilization Not as Easy as It Sounds→

Posted in computer hacks, CPU load, CPU utilization

CP/M Gently

Posted on September 4, 2025 by Al Williams

If you are interested in retrocomputers, you might be like us and old enough to remember the old systems and still have some of the books. But what if you …read more Continue reading CP/M Gently→

Posted in CP/M, retrocomputing

The (RF) Sniff Test

Posted on August 29, 2025 by Al Williams

Sometimes the old tricks are the best. [Kevin] learned an old trick about using a ‘scope to sniff RF noise and pays it forward by sharing it in a recent …read more Continue reading The (RF) Sniff Test→

Posted in oscilloscope, radio hacks, rf noise, RFI, tool hacks

Hackaday Podcast Episode 335: Beer, Toast, and Pi

Posted on August 29, 2025 by Al Williams

What happens when you listen in on Elliot Williams and Al Williams? You get a round up of the best of last week’s Hackaday posts, of course. The topics this …read more Continue reading Hackaday Podcast Episode 335: Beer, Toast, and Pi→

Posted in Hackaday Columns, Hackaday Podcast, Podcasts

The (Data) Plot Thickens

Posted on August 28, 2025 by Al Williams

You’ve generated a ton of data. How do you analyze it and present it? Sure, you can use a spreadsheet. Or break out some programming tools. Or try LabPlot. Sure, …read more Continue reading The (Data) Plot Thickens→

Posted in data analysis, data visualization, Jupyter Notebook, LabPlot, software hacks

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