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 […]
NEW PCB REVIVES ANCIENT BUBBLE LED DISPLAYS Continue Reading
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
SIMPLE ARDUINO UNIVERSAL REMOTE CONTROL Continue Reading
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
LED Straw XMAS Tree Continue Reading
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
Individually addressable incandescent lamps Continue Reading
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
ESP32 Web Server – Arduino IDE Continue Reading
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
Simple circuit indicates a low battery Continue Reading
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
Interfacing a Laser LED with Arduino Continue Reading
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
Stylish IoT Neck Warmer Controlled from Mobile Browser Continue Reading
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
A CUSTOMIZABLE OPEN SOURCE MECHANICAL NUMPAD Continue Reading
Have you shopped for an appliance lately? They’re all LEDs, LEDs everywhere. You might say that manufacturers are out of touch with the utility of tactile controls. [Wingletang]’s fancy new washing machine is cut from this modern cloth. While it does have a nice big knob for selecting cycles, the only indication of your selection
TALKING WASHER IS A CLEAN SOLUTION FOR THE VISUALLY IMPAIRED Continue Reading
