Showing posts with label led. Show all posts
Showing posts with label led. Show all posts
Wednesday, June 12, 2013
Giant LED Screen Traffic Road
"Urban Future" digital road model was jointly created by the well-known Danish construction companies and Audi in the Miami Design Exhibition 2011, the future of urban transportation construction for our new ideas. The show is a huge 185 m2 LED screen, built-in 3D camera tracking pedestrian movement traces and related data to the processor and the formation of a series of artistic images and vehicles on the screen, and after treatment travel path, thereby helping to create a pedestrian and unmanned vehicles to share a harmonious space.
The venture emanated from BIG’s succeeding offer for Mercedes and BIG Illustrate the City Street of the Upcoming which they named (Driver)Less is More, a perform on their comedian YES is More that was launched around the same time. Looking at the renderings you would not be held responsible for considering it was some type of downtown great celebration. The offer has roads included with LED lighting which monitor the actions of everything and set goals to best switch visitors and people on the streets through the place. The idea is to get more visitors circulation while publishing bulk of area for other uses.
The offer came to life amazingly easily as a 190 rectangle gauge set co-developed with Kollision + Schmidhuber & Associate. The pavilion lighting up where individuals are status or going for walks with LED blobs. Where more individuals collect, an lighted reasoning seems to be below them. The pavilion uses 3D cams to recognize people and things and nourishes that information into a pc which then guides driverless energy source through the roads. As individuals switch across the vehicles, their direction changes and is indicated by the online arrows. The pavilion also displays off the Mercedes A2 electrical idea car which is about the same dimension as a Small or Fiat 500.
Monday, May 27, 2013
Multi Colour LED
How many different conditions do you reckon may be signalled with just one LED? Two, maybe three? Using this simple circuit, a lot more! Admittedly, a two-colour LED is used here. Such a device consists of two light-emitting chips, usually red and green, encapsulated in the same case. It has three pins: two for the anodes, and one for the common cathode. In this way, each diode can be activated separately. Various mixed colours may be obtained by varying the current through the two diodes. At least four discrete colours are then easily perceived: pure red, pure green, orange (IR ≈ 2IG) and yellow (IG ≈ 2IR).
In the present circuit, the LED elements are driven by CMOS three-state buffers type 4503, which, unlike most CMOS ICs from the 4000 series, are capable of supplying up to 10 mA of output current. The LED currents are limited by resistors R1 through R6, whose values invite experiments with brightness and colours according to your own taste. The circuit was originally developed to indicate the state of three inputs, a, b, and c (non-binary, i. e., only one of these is at 1 at any time), with the configuration (a=b=c=0) representing the fourth state. The latter is decoded by NAND gate IC1.
An additional effect is produced by gates IC1a and IC1b, which are connected up into an oscillator circuit producing approximately two pulses per second. These pulses are used to control the common-enable input, DA (pin 1) of the 4503, so as to produce a flickering effect. The oscillator is controlled by means of inputs ‘d’ and ‘e’. Pulling both of these logic high disables the oscillator and the LED driver. With e=0 and d=1 the outputs of the 4503 are switched to three-state, and the circuit is in power-down standby mode. Although designed for a 12-V supply voltage, the circuit will happily work at any supply voltage between 5 V and 16 V. Non-used inputs of CMOS ICs must, of course, be tied to ground via 10-100 kW resistors.
[Continue reading]
In the present circuit, the LED elements are driven by CMOS three-state buffers type 4503, which, unlike most CMOS ICs from the 4000 series, are capable of supplying up to 10 mA of output current. The LED currents are limited by resistors R1 through R6, whose values invite experiments with brightness and colours according to your own taste. The circuit was originally developed to indicate the state of three inputs, a, b, and c (non-binary, i. e., only one of these is at 1 at any time), with the configuration (a=b=c=0) representing the fourth state. The latter is decoded by NAND gate IC1.
An additional effect is produced by gates IC1a and IC1b, which are connected up into an oscillator circuit producing approximately two pulses per second. These pulses are used to control the common-enable input, DA (pin 1) of the 4503, so as to produce a flickering effect. The oscillator is controlled by means of inputs ‘d’ and ‘e’. Pulling both of these logic high disables the oscillator and the LED driver. With e=0 and d=1 the outputs of the 4503 are switched to three-state, and the circuit is in power-down standby mode. Although designed for a 12-V supply voltage, the circuit will happily work at any supply voltage between 5 V and 16 V. Non-used inputs of CMOS ICs must, of course, be tied to ground via 10-100 kW resistors.Friday, April 12, 2013
Infra Red IR LED Flood Light Circuit Diagram
Infra Red (IR) LED Flood Light Circuit Diagram
The adjoining design shows a simple IR flood light circuit diagram for IR illumination applications.
The 4049 section is the basic voltage doubler circuit which effectively boosts the 9 V supply to a level of around 15 V which further becomes the suypply voltage for the next 555 pulse modulator section.
The voltage is suitably pulsed as per the settings of P1 and P2 for driving the associated IR LEDs.
The main feature of this circuit is that it utilizes just a single PP3 9 volt battery and yet is able to provide lights (IR) at dazzling levels.
Sunday, March 31, 2013
How to Make a Simple 12 Volt LED Lantern Circuit
We have discussed white LEDs comprehensively through many of my earlier articles and have learned how efficient these lights are with power consumption.
In this article we will study a very simple configuration for making a LED lamp or a LED lantern.
New electronic enthusiasts often get confused with the wiring intricacies while configuring many LEDs in groups.
Here we’ll see how we can connect as many as 64 LEDs for making the proposed unit.
The circuit diagram details may be understood from the following points:
White LEDs typically have a forward voltage drop of about 3 volts.
When operated at the above voltage level, the device is able to produce lights at optimum levels and the spec also maintains better life expectancy.
The minimum current required at the above voltage level is around 20 mA, which again is an optimal magnitude and is ideally suited for a white LED.
That means for driving a single white LED in the most straightforward way we would require 3 * 0.02 = 0.06 watts, that’s pretty negligible compared to the relative illumination received from it.
The best thing is that as long as the above voltage and current spec is observed, the device continues to consume 0.06 watts irrespective of the number of LEDs connected.
In the present circuit, the maximum voltage available is 12, dividing 12 by 3 = 4, meaning 4 numbers of LEDs can be accommodated at this voltage and yet we are able to limit the power to 0.06 watts.
However the above calculation would make the circuit quite vulnerable to voltage drops and if the voltage dropped even by a single volt would make the LED too dim or might just shut them OFF, we don’t want this to happen.
Therefore though the efficiency may drop a bit, we opt for a configuration which would enable the circuit to work even at lower voltages. We include only two LEDs in the series @ o.06 watts.
Now it’s all about connecting the desired number of strings of two LEDs each in parallel until all the 64 bulbs are included in the circuit.
However connecting in parallel would mean multiplying current. Since we have 32 parallel connections means the total consumption will now become 32 * 0.06 = 1.92 watts, still pretty much reasonable.
The connection details can be easily traced from the given schematic.
Your simple LED lantern is ready and may be taken anywhere outdoors with you, probably during night time explorations.
Pats List
All resistors are = 470 Ohms, 1.4 watts,
All LEDs are = white, 5mm, hi-efficiency
Diode = 1N4007
Sunday, March 24, 2013
Six LED Bar Audio Power Indicator
Useful to monitor audio power delivered to loudspeakers No power supply no setup required
This device, connected to the loudspeaker output of an audio amplifier, will indicate the instantaneous output power delivered to the loudspeaker(s) by means of six LEDs illuminating one after another by voltage values increasing little by little, providing the visual impression of a luminous bar or column, increasing and decreasing in height following the increase and decrease of the signals level.
The input signal is first rectified by D1 and then sent to six different voltage dividers, one for each LED. In this way, the indication provided by the LEDs illumination of this "Power Display", will be related to the instantaneous power sunk by the whole loudspeaker cabinet.
Six output power levels are displayed by the LEDs in a 2W - 80W range (no setup required). Each nominal power level indication into 8 Ohms load is reached when the respective LED illuminates at full brightness.
Circuit Diagram:
Six-LED Bar Audio Power Indicator Circuit Diagram
| Parts | Description |
| R1 | 220R 1/2W Resistor |
| R2,R5,R6,R8 | 100R 1/4W Resistors |
| R10,R12,R14 | 100R 1/4W Resistors |
| R3 | 220R 1/4W Resistor |
| R4,R7 | 330R 1/2W Resistors |
| R9 | 560R 1/2W Resistor |
| R11 | 820R 1/2W Resistor |
| R13 | 1K2 1/2W Resistor |
| D1 | 1N4004 400V 1A Diode |
| D2,D4,D6 | BZX79C2V7 2.7V 500mW Zener Diodes |
| D3,D5,D7,D8,D9,D10 | Red LEDs (Any dimension and shape) (See Notes) |
Notes:
- The output power indicated by each LED must be doubled when 4 Ohms loads are driven.
- The circuit can be adapted to suit less powerful amplifiers by reducing the number of LEDs and related voltage dividers.
- LEDs of any dimension can be used, but rectangular shaped devices will be more suitable to be compacted in bars or columns.
- For a stereo amplifier, two identical circuits are required.
Source : www.redcircuits.com
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