If there’s one thing Hollywood loves, it’s a ticking clock to create drama. Nuclear weapons, terrorist bombs, and all manner of other devices have been seen featuring foreboding numbers counting down on a series of 7-segment displays. In this vein, [deshipu] developed a rather ridiculous take on the classic trope. The project is built around a ticking four-digit display. The blue LEDs give it a modern touch ...

Introduction In recent years LED technology has experienced rapid growth in its adoption and general application. Like any other electronic device, LEDs make use of electricity. However, they generate a rather massive amount of heat that would usually be harmful to the lifetime and integrity of the circuit board within it. Metal Core Printed Circuit Board (MCPCB) Technology is responsible for the ability of ...

For those of us who remember LED calculators, the HP 5082-7400 series red “bubble” displays hold a special charm. Available in 3, 4, or 5-digit varieties, these multiplexed 7-segment displays provided countless hours of entertainment to those who would spell upside-down words on their pocket calculators. In case you happen to be lucky enough to have access to a few of these beautiful vintage display sticks, ...

The infrared remote control might not hold the seat of honor in the average home theater setup that it once enjoyed, but it’s not quite out to pasture yet. After all, what are you going to use to stop Netflix once the Chromecast invariably disconnects from your phone? As long as there are devices out there that will respond to commands blasted their way via an IR LED, hackers will be looking to get in on th ...

A simple, original and cheap Christmas tree made with LED-illuminated plastic straws that can be controlled over WiFi. Things used in this project Hardware components Arduino MKR1000 × 1 USB-A to Micro-USB Cable × 1 LED (generic) × 12 Resistor 330 ohm × 12 Software apps and online services Arduino Web Editor Arduino IDE Story Overview This is an original, cheap and easy-to-do "Internet of Holiday Things" pr ...

Everyone playing with electronics these days knows about LED strips made of dozens or hundreds of individually addressable RGB LEDs. I love them and make great use of them in the nootropic design Lumazoid music visualizer. But what about incandescent lamps? Old-school light bulbs with a filament have a soft warm glow that you just can’t get from LEDs. Wouldn’t it be great to be able to control a bunch of la ...

This project turns on and turns off a laser LED after every second. It can also monitor its own supply voltage level. The circuit can be extended for use as an audio-visual alarm system for security applications. Keyes KY-008 laser transmitter module is available at www.ebay.com. But there is a lot of confusion regarding this particular module; it is impossible to find its datasheet or any kind of related d ...

In this project you’ll create a standalone web server with an ESP32 that can toggle two LEDs using the Arduino IDE programming environment. If you want to learn more about the ESP32 dev board, read my Getting Started Guide with ESP32.  First, watch the video demonstration below Preparing the ESP32 board in Arduino IDE There’s an add-on for the Arduino IDE that allows you to program the ESP32 using the Ardui ...

The Design Idea in Figure 1 indicates a low-battery condition in an audio test instrument that is powered by four AA cells. As the instrument was otherwise an all-discrete design, this same approach seemed more in keeping with the spirit of the project than the use of a single-sourced integrated circuit. A garden-variety red LED serves as both the indicator and the voltage reference. A small current through ...

This project turns on and turns off a laser LED after every second. It can also monitor its own supply voltage level. The circuit can be extended for use as an audio-visual alarm system for security applications. Keyes KY-008 laser transmitter module is available at www.ebay.com. But there is a lot of confusion regarding this particular module; it is impossible to find its datasheet or any kind of related d ...

The IoT version of a stylish neck warmer directly coming from this year’s Fashion Weeks rolled into London, Paris and New York. Things used in this project Hardware components Arduino MKR1000 × 1 Alligator Clips × 1 Jumper wires (generic) × 1 Adafruit NeoPixel Digital RGBW LED Strip - White PCB 30 LED/m × 1 Li-Ion Battery 1000mAh × 1 Software apps and online services Mobile web browser Story Motivation Afte ...

Mechanical keyboards with reduced key counts are all the rage these days, but while those streamlined input devices might look cool on your desk, there are times when the traditional number pad or navigation keys are quite handy. Rather than just going without, [Mattia Dal Ben] decided to put together his own mechanical auxiliary input device for when the main board just isn’t cutting it. [Mattia] is callin ...