Tag Archives: Led

LED Based Strobe For Entertainment, Events & Warning Signals

Strobe provides regular flashes of light. Usually Strobes are designed using Xenon Tubes. Here is LED based simple solution that can be used as strobe for entertainment and events and also as warning signals. Project is based on PIC16F1825 micro-controller with two digit frequency display.

Project provides TTL output signal, frequency 1Hz-25Hz, Tact switches provided to set the frequency.

This project works along with DC Output Solid State Relay

Features

  • Supply 4.5 to 5V DC
  • Frequency 1Hz To 25Hz
  • Easy Interface with Relay Board
  • Easy Interface with Solid State Relay
  • On Board Power LED
  • On Board Output LED
  • Onboard Switch to set the frequency
  • 2X7 Segment 0.5 Inch Display

LED Based Strobe For Entertainment, Events & Warning Signals – [Link]

Ultra-thin, high thermal conductivity substrate integrates ESD protection

Clemens Valens @ elektormagazine.com discuss about a new IC substrate. He writes:

A new, ultra-thin ceramic substrate with an ESD strength of up to 25 kV – more than three times higher than the standard 8 kV of state-of-the-art Zener diodes – also features a high thermal conductivity of 22 W/mK. This is three times better than that of conventional carriers, even though the substrate is significantly slimmer. The new technology is especially well-suited for LED applications where the number and density of LEDs per unit continues to grow.

Ultra-thin, high thermal conductivity substrate integrates ESD protection – [Link]

AS7221, An IoT Smart Lighting Manager

ams AG, a multinational semiconductor manufacturer and provider of high performance sensors and analog ICs, had announced the AS7221, an integrated white-tunable smart lighting manager that can be controlled through its network connection by means of simple text-based commands.

AS7221 Block Diagram

AS7221 is a networking-enabled IoT Smart Lighting Manager with embedded tri-stimulus color sensing for direct CIE color point mapping and control. IoT luminaire control is through a network connection, or by direct connection to 0-10V dimmers, with control outputs that include direct PWM to LED drivers and analog 0-10V to dimming ballasts. A simple text-based Smart Lighting Command Set and serial UART interface, enable easy integration to standard network clients.

Key features of AS7221:

  • Calibrated XYZ tri-stimulus color sensing for direct translation to CIE 1931/1976 standard observer color maps
  • Autonomous color point and lumen output adjustment resulting in automatic spectral and lumen maintenance
  • Simple UART interface for connection to network hardware clients for protocols such as Bluetooth, ZigBee and WiFi
  • Smart Lighting Command Set (SLCS) uses simple text-based commands to control and configure a wide variety of functions
  • Directly interfaces to 0-10V dimmer controls and standard occupancy sensors
  • Built-in PWM generator to dim LED lamps and luminaires
  • 12-bit resolution for precise dimming down to 1%
  • 0-10V analog output for control of conventional dimming ballasts in a current steering design
  • 20-pin LGA package 4.5mm x 4.7mm x 2.5mm with integrated aperture

“The next generation of lighting will be defined by three key characteristics: controllability, adaptation and connected architectures,” said Tom Griffiths, Senior Marketing Manager at ams. “Our new family of smart lighting managers meet those criteria. With this latest entry, we are addressing the luminaire manufacturers’ critical time-to-market challenge for developing and deploying a spectrally tunable luminaire that is cost-effective, accurate, and which smoothly integrates into the Internet of Things”.

The AS7221 is the first extension to ams’s recently announced Cognitive Lighting™ smart lighting manager family. The compact AS7221 will be available in a 5x5mm LGA package, for flexible integration into both luminaires and larger replacement lamps.

There are main domains of AS7221 applications, some of them are:

  • Smart home and smart building
  • Variable CCT general lighting industrial lighting
  • Retail and hospitality lighting with white-color tuning
  • LED tro ers, panel and downlights
  • LED replacement lamps (LED bulbs)
AS7221 Functional Diagram

Pricing for the AS7221 Spectral Tuning IoT Smart Lighting Manager is set at $3.13 in quantities of 10,000 pieces, and is available in production volumes now.

You can find AS7221 datasheet here.

NVSW319A, A New High Power LED By Nichia

Nichia Corporation, the Japanese chemical engineering and manufacturing company, announced the NVSW319A as a new high-power LED that achieves 164 lm/W at 700mA (5,000K).

The 319A is a 3.5×3.5×2.1 mm size LED which is footprint compatible with the old 3.5mm LEDs. The breakdown is specified at 1,050 mA (~3 W). Nichia planned to start the mass production of this LEDs in the end of December 2016 or in the early January 2017.

“The 319A is a production device, i.e. not one shining brightly deep down in a liquid nitrogen vessel or in the minds of a few theorists at MIT.” Nichia say.

A variant with 3000K color temperature is expected to yield 415 lm with a minimum CRI (color rendering index) of 80. This device won’t give you much deep red though as its R9 CRI specification is zero.

Source: elektor

DIY Breathalyzer Using Arduino UNO

Today I am going to discuss how to make a very simple DIY Breathalyzer using Arduino UNO and few external components. Ana Carolina designed this project as an instructable in instructables.com. This is a low-cost project and a useful one too. If you have no idea about what breathalyzer is, let me explain briefly: A breathalyzer is a device for estimating blood alcohol content (BAC) from a breath sample. Check the link given for more information.

Arduino Based Breathalyzer
Arduino Based Breathalyzer

Requirements:

  • Arduino Uno
  • MQ-3 Alcohol Sensor
  • 128×64 LCD (Liquid Crystal Display)
  • 7 × 330 Ohm Resistor
  • 7 × LEDs (1 Red, 2 Yellow, 3 Green and one other color)
  • Jumpers Wires
  • Breadboard
  • Soldering Iron (optional)
  • Solder Wire (optional)

Details:

This project is very simple. Here we are using an array of six LEDs and a 128×64 LCD to display the alcohol level. The presence of alcohol is sensed by an MQ-3 alcohol sensor and then analyzed by an Arduino board. We are using Arduino UNO in this project, but any model can do the job.

Three Green LEDs represent that alcohol level is OK and within the safe limit. Two Yellow LEDs are used to describe that safe limit is going to be reached, and you know it well why the Red LED is there. In fact, those LEDs are used just to give you a quick idea. If you want to know the exact value, the display is there for you.

You can tweak the program and re-calibrate the breathalyzer. But you must remember that breathalyzer doesn’t precisely measure your blood alcohol content, rather it estimates a value from the amount of alcohol in your breath.

Circuit:

Breathalyzer Circuit On Breadboard
Breathalyzer Circuit On Breadboard

You can make the circuit also on PCB or Veroboard. But for the prototyping purpose, the breadboard is the best choice. You can see how straight forward the connections are.

The Code:

Some part of the original code was in Portuguese. So I have translated it into English. Also, the original code shared by the author in instrucatbles.com is a buggy one. So, I recommend you to use my bug-free code instead of the original one.

Please note that you have to download and add the u8glib library in Arduino IDE beforehand. It is very important. You can either download the u8glib v1.14 library for Arduino directly or go to the site and choose what to download.

Follow the given steps to add a .zip library in your sketch: Open IDE and click on Sketch  Include Library  Add .zip Library. Now select the downloaded .zip library file. You needn’t unzip it.

When everything is done, verify and upload the code to Arduino.

Test It:

I must not recommend you to drink alcohol just for testing the breathalyzer. Rather get a towel and spray alcohol on it. Now hold the towel in front of the sensor. Move it back and forth to observe the change in reading. It may take a while for the breathalyzer to stabilize.

Consider watching the video for a better understanding:

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A Christmas star with Neopixel LEDs

A geeky Christmas decoration made with 56 LED Neopixel and controlled via an Arduino Micro board:

Let’s take a look, therefore, at the project’s electrical section, that is essentially composed of a set of 56 Neopixel LEDs, that have been arranged so to form two concentric stars; the first 35 RGB LEDs (out of 56) form the bigger, external star, while the other 20 ones form the smaller and internal star. The LED number 56 is placed exactly at the center of the printed circuit board, that has the shape of a five-pointed star.
The Neopixel LEDs are connected in cascade but powered in parallel; such a configuration enables to address each single LED and to individually choose the colour; among the possible hues, the 256 possible combinations for each primary colour (therefore we have 256x256x256 combinations!) determine a total of 16,777,216 colours: that’s what one would call true colours!

A Christmas star with Neopixel LEDs – [Link]

Tiny LED Time Watch

tinytimewatch

David Johnson-Davies designed a minimalist ATtiny85-based watch using 12 LEDs, arranged like a clock face, to show the time in analogue-style. He writes:

To show the time you press the button on the watch face, and the time is then displayed for four seconds. It lights one LED to show the hour, and flashes another LED to show the minutes to the nearest five minutes, like the hour and minute hands on a clock. If only one LED lights up you know that both hands are pointing to the same hour mark.

Tiny LED Time Watch – [Link]

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Simple Electronic dice

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This project is an electronic dice. It consists of seven LEDs positioned like a dice which light up to show the number.

The leds are controlled by a 74HC4017 decade counter IC. Of this IC six outputs are used to drive the LEDs and a seventh output is used to reset the counter. This way it only counts up to six. To light up the correct LEDs, diodes are used. These block the current in one way so other outputs of the IC aren’t affected when LEDs are connected to multiple outputs.

Simple Electronic dice – [Link]

RELATED POSTS

World’s first broadband infrared LED by Osram

2016-11-03-eete-jh-osram_0

Designed for everyday food analytics, the SFH 4735 LED emits broadband infrared light in a wavelength range from 650 to 1,050 nanometers. by Julien Happich @ edn-europe.com

The component is well suited as a light source for near-infrared spectroscopy, for example to assess the quality of food thanks to mini spectrometers that could be developed as an add-on for smartphones.

World’s first broadband infrared LED by Osram – [Link]

WiFi-enabled Color LED Matrix using ESP8266 and WS2812 LEDs

img_20161029_234314-1024x651

ray @ rayshobby.net build a wifi enabled color led matrix using ESP8266. He writes:

Last Thursday I had a lot of fun doing a workshop at my college (UMass Amherst) where I taught students to use a WiFi-enabled Color LED matrix combined with Javascript programs to create animations displayed onto the LED matrix. The matrix is made of 5×7 WS2812 (NeoPixel) LEDs.

WiFi-enabled Color LED Matrix using ESP8266 and WS2812 LEDs – [Link]