Glowing LED Eye for Little Toys
The objective of this little, and a bit odd, experiment is to explore the use of a single LED as a fancy glowing eye for toys and the use of a BJT as a simple […]
Lavet-type Stepping Motor & Quartz Clock Engine Hacks!
Wikipedia says the Lavet-type Stepping Motor is a special kind of single-phase stepping motor widely used as a drive-in electromechanical clock. Aside from clock drives, there are many variations of Lavet’s concept, and one example […]
Illuminated Dog Collar v1
Walking a dog in the dark is always a risky thing because both you and your dog are difficult to see. Fortunately, an illuminated dog collar helps you see and be seen during dog walks […]
Infrared Motor Speed Sensor – Refined Primer
A timely review is beneficial to all. So, here’s the long-awaited sequel of my old post about infrared motor speed sensors and motor speed sensor modules. This is the direct link to read that popular […]
Optical Needle Deflection Sensor
Sometimes you may want to detect the deflection of the needle of an instrument by a non-contact method. If so, this idea might help you! I will now show you a simple technique for optically […]
LED Throwies & Build Ideas
Here’s a project for fun – Magnetic LED Throwies! LED Throwies were invented in 2006 by the Grafitti Research Lab in New York City to use as non-destructive graffiti. Build one (or several) yourself right […]
Raspberry Pi Pico ADC & Quick Experiments
A few months ago, I read about some strange issues with Raspberry Pi Pico’s ADC. According to those stories, Raspberry Pi has confirmed its investigation of reports of a design flaw in the ADC (analog […]
Arduino Digital Start/Stop Power Switch Box
Lately, I started thinking about a digital start/stop power switch box. Sure, I could buy one easily but where is the fun in that? In this post, you will find an outline of that small […]
Simple Steam Sensor Build & AHS01IB Absolute Humidity Sensor
Some time ago I was asked by a voracious reader to design a simple steam sensor switch for him. The purpose of the steam sensor switch was to turn on an electric switch when the […]
Pro Mini Pull-Pin Alarm
Here you can find the project details of a simple and low-cost pull-pin security alarm. While travelling, rig the alarm unit to your luggage using the alarm security cable. If so, when somebody tries remove […]