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 […]
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 […]
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 […]
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 […]
Mod Your Goodknight Gold Flash
I’m sure there’re a lot of electronic gadgets in your house that can be recycled. The good news is most of them can be used again or for another purpose. So, don’t just throw those […]
Arduino Traffic Lights (v2) – Crosswalk Button
I finally got around to testing this concept – adding a crosswalk button to the previously published Arduino Traffic Lights project I must admit, I was surprised to find a compact traffic light controller module […]
Pool LED Lamps & Idea Sparks
Recently while searching for little floating toys, I came across some inexpensive Chinese LED pool lamps. Most sellers described them as water-activated lotus/lily LED flower lamps. Out of curiosity, I purchased a few of them […]
Little Light Sensor Switch OPT101
Some time ago my neighbor asked me to design a better light sensor module. In fact, he already has a few small light sensor modules to automatically control the lights in his barn. Those cheap […]
Solar LED Lantern Torch – Quick Teardown
Have you ever wondered what’s inside this cheap Chinese Solar LED Lantern Torch? Although it appears like a safe and beautiful emergency lamp, be aware that it has the potential to kill you through its […]