By T.K. Hareendran

International Electronic Design Freelancer • Technical Author • Hardware βeta Tester • Product Reviewer
Articles Written 464

Foldback Current Limiting – Little Secrets

Wikipedia says Current Limiting is the practice of imposing a limit on the current that may be delivered to a load to protect the circuit generating or transmitting the current from harmful effects due to […]

Raspberry Pi Pico Xmas Pixels

Happy Xmas is near, so it’s time to build your own festive lights to surprise your neighbors. In this post, you will learn how to make Christmas special LED pixels with Raspberry Pi Pico! First […]

Arduino LED Signal Wand Light

This is an update to an old project of mine that was printed almost a decade ago! Here is the link to that little nostalgic project https://www.electronicsforu.com/electronics-projects/portable-signal-wand At this point, I’m using a microcontroller as […]

Backpack LED Patch (v2)

After posting the Backpack NeoPixel LED Safety Light project (https://www.codrey.com/arduino-projects/backpack-neopixel-led-safety-light/), I received a lot of requests to publish another do it yourself project based on regular light-emitting diodes, instead of using NeoPixel LEDs. So, I […]

Sound Reactive Pixel LEDs

This little post covers the construction details of sound reactive pixels which is pretty enjoyable to build and watch. You can embed it in a lot of things, for example, think about gluing it in […]

USB Cigarette Lighter Teardown

I was after a cheap windproof electric lighter to use in and around the home. Well, they are cheap enough to buy heaps of them, so I bought a pair of USB cigarette lighters to […]

Arduino Portable Ultrasonic Distance Meter

After a little bit of research, I discovered that building a portable ultrasonic distance meter using Arduino was indeed a very simple task. I was surprised to discover that integrating a tiny OLED display into […]

Arduino Light up Coaster Ideas (v1)

Now is the time to make something that lights up! As promised in one of my previous posts, I’m sharing some crude design ideas for making your own coaster that wakes up as it listens […]