A miniature persistence-of-vision board
https://www.electronics-lab.com/miniature-persistence-vision-board/
axio.ms published an update of the board and firmware of their SMD POV display. This device is simply 8 bright SMD LEDs and an AVR uC and makes use of the Persistence of Vision effect. You wave it about, and it writes messages in the air, with no wires, liquids or unpleasant bending! Some would […]
Matrix driver IC supports up to 192 LEDs
https://www.electronics-lab.com/matrix-driver-ic-supports-192-leds/
Integrated Silicon Solution has released a family of high performance LED drivers, IS31FL3733, IS31FL3736 and IS31FL3737 to support LED matrices consisting of 192, 96 and 144 LEDs respectively. By Julien Happich @ edn-europe.com ISSI’s LED matrix architecture provides designers with flexibility in controlling individual LEDs or an array of LEDs resulting in simplified color adjustment […]
4 digit charlieplexed segment display
https://www.electronics-lab.com/4-digit-charlieplexed-segment-display/
bobricius @ hackaday.io has designed an ultra thin custom display, requiring only 6 gpio pins to drive 30 leds. FEATURES: – 1.05×0.48 inches (26.67×12.22 mm) – 30 led – any color – ultra thin …. etc. on 0.8mm board – only 6 gpio – ideal for wrist watch 4 digit charlieplexed segment display – [Link]
Peak Smart Lamp – Grow Daily
https://www.electronics-lab.com/peak-smart-lamp-grow-daily/
Peak is a smart lamp that combines light, encouraging messages and a personal improvement algorithm to help you form better habits. Peak is the first smart lamp that helps people form better habits in small, progressive steps. Developing new habits is challenging. We often resist change, even when it’s good for us. Peak cuts through […]
Mid-power UV LED operates at 365 nm
https://www.electronics-lab.com/mid-power-uv-led-operates-365-nm/
A ceramic-based UV LED, the VLMU1610-365-135 from Vishay provides typical radiant power of 18 mW at 20 mA and 50 mW at 60 mA over a wavelength range of 362.5 nm to 370 nm. The silicone lens of the device enables extremely long lifetimes of up to 25,000 hour, compared to typical mercury lamp lifetimes […]
Simple two-transistor circuit lights LEDs
https://www.electronics-lab.com/simple-two-transistor-circuit-lights-leds/
Barry Tigner @ edn.com has a design idea on how to power a LED from a 1.5V battery using two easily available transistors. A previous Design Idea describes a circuit that uses an astable multivibrator to drive an LED (Reference 1). The circuit in Figure 1 uses a simpler alternative approach. The circuit uses a […]
Arduino Proximity Alarm
https://www.electronics-lab.com/arduino-proximity-alarm/
Lucas Reed @ instructables.com has build a proximity alarm using Arduino and an ultrasonic sensor from Parallax. If a nearby object is approaching then the alarm will sound and an RGB LED will light up. He writes: An ultrasonic rangefinder and Arduino microcontroller will check for nearby objects and if need be, alert you with […]
“Chipiplexing” efficiently drives multiple LEDs using few microcontroller ports
https://www.electronics-lab.com/chipiplexing-efficiently-drives-multiple-leds-using-few-microcontroller-ports/
by Guillermo Jaquenod @ edn.com Actual microcontrollers have powerful bidirectional I/O ports, and you can use different techniques to fully exploit such capabilities. Recent Design Ideas described the “Charlieplexing” method as an effective way to drive M=N×(N–1) LEDs using only N bidirectional I/O ports and N resistors (reference 1 and reference 2). Unfortunately, using Charlieplexing […]
Accurately simulate an LED
https://www.electronics-lab.com/accurately-simulate-led/
Jon Roman and Donald Schelle have a design idea on how to simulate a high power led to test your driver circuit. Testing the driver circuit using LEDs, although easy, yields only typical results because the tests don’t factor in worst-case LED parameters and often generate undesirable light and heat during driver debugging. Although using […]
TritiLED – Multi-year always-on LED
https://www.electronics-lab.com/tritiled-multi-year-always-led/
Ted Yapo has designed a multi-year always-on LED replacements for gaseous tritium light sources. TritiLEDs are always-on battery powered LED glow lights for general night-time marking use. Radioactive gaseous tritium light sources (GTLSs) are allowed in the United States in several consumer product categories, including watches, compasses, and gun sights, but general-purpose markers are considered […]