Freelance Tech Journalist / Technical Writer, Engineering Consultant

Jeremy Cook Consulting

Jeremy Cook is a freelance tech journalist and engineering consultant with over 10 years of factory automation experience. An avid maker and experimenter, you can follow him on Twitter, or see his electromechanical exploits on the Jeremy S. Cook YouTube Channel!

Articles 41 - 60

Simple MP3 Audio Playback With Raspberry Pi Pico - Blog

December 12, 2022

The RP2040, with a processing speed of 133 MHz, is capable of decoding MP3 files, and the Pico RP2040 dev board includes 2 MB of Flash–enough to store a significant amount of compressed audio. At a list price of $4, the Pico therefore makes an incredible and cost-effective platform for embedded audio playback.

Open Source

SolveSpace: Light Weight Open Source 3D CAD - Blog

December 01, 2022

Recently I happened upon a 3D CAD package1 called SolveSpace. While not the only free and/or freemium package on the market, something about its dark, simplistic interface seemed intriguing. A quick download and install on my Mac OS machine, and I had it running. It boots up in around a second, and it takes up less than 30MB installed, both big positives in my book.

Open Source

KiCad 6 Align, Distribute, and Array Functions for Massive Time Savings - Blog

November 16, 2022

Placing components in the KiCad 6 PCB editor is fairly easy in a broad sense. If you have your grid set correctly, and enough space, getting things roughly in place and connected is fairly trivial. However, what if you need to place a number of footprints in a line, or need to make a grid of vias? Placing each one individually can be tedious, so for these tasks use the align, distribute, and array commands to save  a massive amount of time and frustration!

Debug & Test

OWON HDS2102S: ~$250 Handheld Scope Review - Blog

November 02, 2022

Depending on your level of electronics knowledge, work, and/or experimentation, a voltmeter may be sufficient for your diagnostic needs. However, being able to see the way an electronic signal changes over time, or perhaps even multiple signals, takes your analysis capabilities to a whole new level.

Open Source

Arduino IDE: 2.0 First Look - Blog

October 13, 2022

This September (2022), Arduino announced that its much anticipated 2.0 IDE has been moved to stable and is available for download. New features include the ability to use the serial monitor and plotter simultaneously, quicker compilation, auto-complete, and a number of other enhancements that make it a huge improvement overall.

Open Source

Hands-On With the Sparkfun Pro Micro RP2040 - Blog

September 26, 2022

The Raspberry Pi RP2040 microcontroller, along with the Pico dev board, and the Pico W (WiFi), have taken the maker world by storm since its original introduction in early 2021. And for good reason, as at $4 for the Pico, $6 for the ‘W, and around a dollar for the chip itself, this 133MHz Arm Cortex-M0+ processor based device is quite an interesting piece of hardware.

Open Source

Talkie Library Makes Your Arduino Speak Like It’s 1985 - Blog

September 19, 2022

Perhaps you remember the early voice synthesizers of the 1980s, which “spoke” in a muffled, marginally intelligible tone. Audio data storage was based on a linear predictive coding (LPC) format, and played back with a voice synthesis processor (VSP).

Analog & Power

Fusion 360 Used with KiCad to Produce Unique PCB Diffuser Clock - Blog

August 26, 2022

Printed circuit boards are, at their most basic, a way to arrange conductors that travel between solder-mounted parts. At the same time, they’re extremely strong sections of precision-cut and coated fiberglass, that could have structural uses as well.

Open Source

Hands-On With the Wemos S2 Mini ESP32 Development Board - Blog

August 01, 2022

If you’re looking for a great way to get started with the ESP32, the Wemos/LOLIN S2 mini is an excellent option. It comes in a form factor compatible with the ESP8266-based Wemos/LOLIN D1 mini, and the S2 mini can thus work with D2 mini shields. Ground, Vbus, and 3V3 pins are in the same place, though the IO pin numbering is different, so any swaps would certainly require a bit of reprogramming for proper functionality.


Mooltipass BLE Password Authenticator Hands-On Review - Blog

June 30, 2022

Today we’re required to use a password for everything from Google, to PlayStation, to Costco, and any number of other websites and services in-between. Using one password for everything is a serious vulnerability, and keeping multiple passwords written down on a notecard, or as a plain text file on your computer are both problematic. Even dedicated online password keepers can be hacked.

Open Source

Raspberry Pi PWM Fan Speed Control - Blog

May 23, 2022

As you probably know, Raspberry Pi single-board computers, especially Pi 4 models, can get quite hot. While passive cooling options are often good enough to avoid overheating and thermal throttling, at some point you’ll need to think about using a cooling fan. The Raspberry Pi’s GPIO pins don’t supply enough current to power even a small fan, but there are several ways to power and control a fan with the Pi.

Open Source

Experimental Foot Pedal Computer Interface - Blog

May 16, 2022

The vast majority of computer control is done by hand, using a keyboard, mouse, or touchscreen, but what about your feet? They’re perfectly capable of tapping out a signal, but generally sit unused when at a computer. In my latest experiment, I set out to see if common spring-loaded foot pedals would work as a computer interface, perhaps for controlling shift, control, or other modifier keys. Short answer: yes, it can work. There are, however, a few complications.

Analog & Power

Optimize KiCad Schematic to Facilitate PCB Routing - Blog

May 12, 2022

As a PCB design becomes more involved, managing complexity becomes ever more important to the process. Last month’s article about using hierarchical sheets presents an excellent tool for organizing schematics. This is helpful, but at the end of the day these theoretical connections must be transferred to the PCB layout editor for on-screen routing, and ultimately physical manufacturing. To help simplify physical routing, consider how components will be arranged when designing your schematic.

Analog & Power

KiCad Hierarchical Sheets for Enhanced Schematics - Blog

April 28, 2022

For simple KiCad circuit designs, a sheet with lines going from one component to another is good enough. Add in net labels, and slightly more complicated drawings can be cleaned up nicely. At some point, however, your design may become too large to fit onto a standard sheet. You’re faced with a choice: expand the sheet to cover more area–useful, but often clumsy–or break schematic data up into a series of linked hierarchical sheets.

Analog & Power

V-Score Board Separation: Why, How, and Thru-Hole Temporary Connection Trick - Blog

April 27, 2022

Some time ago, I wrote an article about panelization basics, mostly focusing on “mouse bites” as the panel separation technique. The other way to separate boards is using a technique called v-scoring. The basics of this technique are shown in the Royal Circuit Solutions video below, which is meant to selectively weaken a PCB for separation at a later point.

Analog & Power

Add a QR Code to Your KiCad PCB Design - Blog

April 25, 2022

QR codes applied to a printed circuit boards are a great way to reference documentation, a store, or wherever other info is needed for a situation. Adding on to your PCB is quite simple using KiCad, as outlined in this article.

Analog & Power

Raspberry Pi 4 Prototyping Enclosure Made From PCBs - Blog

March 22, 2022

Printed circuit boards are amazing devices, able to zip electrons from component to component with the greatest of ease. Consider, however, that PCBs are extremely tough, and can be manufactured accurately and inexpensively, to be delivered in a few days.

Analog & Power

​​​​​​Printed Circuit Board Panelization Basics - Blog

March 01, 2022

When you design a small run of boards for fabrication, it’s extremely likely that the PCB manufacturer will place it in a panel for manufacturing with a number of other designs. This “panelization” allows for boards to be made for low prices, since board space can be efficiently shared between orders.

Open Source

Kickstarter Fulfillment Workspace and Jigs - Blog

February 25, 2022

I’m currently just over halfway through fulfillment on the JC Pro Macro 2 keypad kickstarter project. 178 people pledged with the expectation of a reward, meaning that putting a bit of time and thought into my fulfillment workspace at the beginning was an excellent use of time and resources.

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