Tech Explorations Blog

News and articles about education technology

Dealing with false triggers from a PIR sensor

The PIR sensor is very sensitive and is known to be creating false triggers, i.e. it will occasionally go LOW to indicate that there is no movement, even though there is movement. There are two things you can do to create a more reliable detection system (and this can deliver the functionality...
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Introducing our new 3D design & printing course

As Makers, we always find ourselves in looking of things that make our projects better. It could be an enclosure for your electronics project with cable and sensor opening at exactly the right spot. Or a replacement part for a drone. Or little things that make life easier, like a hook for your...
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Meet Genomics Superstar Rebecca, and Super Dad Nigel

On Stemiverse Podcast, we interview extraordinary people from around the world who, in their unique way, are forces of good. Our guests tend to have a lot of common traits, but two, in particular, stand out: They are ready to learn real-world skills They are prepared to help others in...
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The difference between unipolar and bipolar stepper motors

The unipolar stepper motor operates with one winding with a center tap per phase. Each section of the winding is switched on for each direction of the magnetic field. Each winding is made relatively simple with the commutation circuit, this is done since the arrangement has a magnetic pole which...
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Stemiverse 0042 - Ruthe Farmer on increasing girls’ participation in technology and engineering

Welcome to Stemiverse Podcast episode 42. In this episode, Peter talks with Ruthe Farmer. Sorry, your browser does not seem to support the audio player. Please consider upgrading to the latest Firefox, Chrome or Safari browser. Ruthe Farmer is Chief...
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Stemiverse 0041 - Dr. Rebecca Johnson and Superstar genomics

Welcome to Stemiverse Podcast episode 41. In this episode, Peter talks with Dr. Rebecca Johnson. Sorry, your browser does not seem to support the audio player. Please consider upgrading to the latest Firefox, Chrome or Safari browser. Dr. Johnson is...
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New course! Make an Open Source Drone: More fun

After a month full of drama, fun, and lots of learning, I am pleased to announce our latest course: "Make an Open Source Drone: More Fun." Making this course was particularly challenging for me. I set out to explore new territory, using hardware and software that I had not used in the...
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Two new lectures published in Kicad Like a Pro

I have just published two new lectures in response to a student question. Both lectures focus on Pcbnew. The first one shows how to select and lock multiple footprints in place, and the second one how to import multiple .pretty (footprint) libraries. You will find them in the section "Video...
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The postmortem of a drone crash

During my career as a hobbyist drone pilot, I had a few rough landings, but never a crash. Until Tuesday, May 15, 2018. I took my DIY drone out to a nearby oval for a test flight. I had made significant changes to the drone's configuration as part of the course I am currently working on: "Make...
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What is "instantiation" in an Arduino or C++ program?

In programming and object-oriented programming in particular, "instantiation" means allocating memory to an object and preparing it for operation. In this post, I will try to explain what instantiation is. To keep things simple and in hope that I will not also confuse you, consider this,...
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