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15 Jun 2011

Forrest M. Mims III posts this quick and easy project on Jameco’s website demonstrating how to make a simple two-way opto-isolator using two LEDs. [via]

Quick and easy two-way opto-isolator – [Link]

15 Jun 2011

dangerousprototypes.com writes:

Dmitry Grinberg had a few PIC12F1840 MCUs lying around, and wanted to use them in some type of IR remote control project. He decided to construct a remote control mood light using the PICs in both transmitter and receiver. Four high-brightness LEDs (White, Red, Green, and Blue) are used to combine to form different colors in the receiver unit housed in a jar, along with a 38 kHz IR receiver module. The commands are generated by a PIC (housed in a gutted remote control housing) and transmitted via IR LED.

Remote control mood light – [Link]

9 Jun 2011

andyk75 writes:

You know it, in the winter time it is hard to get up, because it is dark outside and your body just won’t wake up in the middle of the night. So you can buy an alarm-clock that wakes you up with light. These devices are not as expensive as few years ago, but most of them look really ugly.
On the other hand, most of the time it is also dark when you come home from work. So the great sunset is also gone. Wintertime seems sad, isn’t it?

But not for the readers of this instructable. It explains you how to build a combined sunrise and sunset-lamp from a picaxe microcontroller, some LEDs and a few other parts.

A sunrise and sunset lamp with LEDs – [Link]

9 Jun 2011

theledart.com writes:

Just finished assembling Aurora 9×18. Based on the prototype aurora 9, this unit has 18 tri-color LEDs in each of 9 circles.
Because of the number of components (162 LEDs), assembly was quite a chore. Tri-color LED has pins that are close together, very narrow for a through-hole component. Solder bridging can happen very easily. (I’ve been soldering for over 30 years now, and thought I had good enough skill to get through the soldering, but I had a bit of a struggle…)

LED Aurora 9×18 – [Link]

8 Jun 2011

tinkeringetc.blogspot.com writes:

My first electronics project of the summer is now finished. Overall, it didn’t take me too long to complete, and I’m very pleased with the results. Watch this video overview and check after the break for all the juicy details.

Linksys LED Matrix – [Link]

8 Jun 2011

dangerousprototypes.com writes:

Siliconfish used to build IR cameras for a living, so he knows something about the effects light of various IR wavelengths can have on a camera. When his town installed photo cameras on the traffic lights, he decided to experiment with an array of IR LEDs mounted on a license plate frame to see what effect this would have on traffic light cameras. He presents his project details here for educational and research purposes only.

IR LED speed camera license plate blocker – [Link]

8 Jun 2011

Micrel has announced the availability of the MIC4811 High Current 6 Channel Linear WLED Driver with DAM™ and Ultra Fast PWM™ Control.

The MIC4811/MIC4812 are high efficiency linear White LED (WLED) drivers designed to drive up to six high current WLEDs for signage lighting. The MIC4811/MIC4812 provide the highest possible efficiency at low source voltages as this architecture has no switching losses present in traditional charge pumps or inductive boost circuits. These linear drivers maintain constant current for up to six WLEDs and feature a typical dropout of 100mV at 50mA (MIC4811) and 190mV at 100mA (MIC4812).

The MIC4811/MIC4812 feature Dynamic Average Matching™ (DAM™) which is specifically designed to provide optimum matching across all WLEDs.

The datasheet and evaluation board schematic can be found on the Micrel website.

MIC4811: High Current 6 Channel Linear WLED Driver with DAM™ and Ultra Fast PWM™ Control – [Link]

7 Jun 2011

Custom RGB LED Turn Signals for My Car @ Starfire’s Tech Blog [via] .

Just wanted to throw this up here. Been working on some RGB LED turn signals for my car (2008 Mustang GT/CS) I’m using the Adafruit pixels http://www.adafruit.com/products/307 for them, there are 35 in each light. Why you may ask? First off why not! Second I take my car to cay shows and just like to have someone unique that I made myself. Third I had bought some LED bulbs that were advertised to match the stock headlights in color but they are far from it, they ended up very blue like a typical white LED, I was guessing they used warm whites but I was wrong so after making some tail lights for my dads car I figured why not do the same to mine. Anyways here is a video that give info and how they look, I’ll post more as they come along. (Picture of car at end of video!)

Custom RGB LED Turn Signals For Car – [Link]

6 Jun 2011

Electronic business card / scroll display. 85 SMD 0805 led’s matrix display, Atmega88V uController, and couple of other smd parts. Dimensions are 24mm x 85mm, supplied from 3V small coin battery. It will work for long time, even on discharged battery (2V). After button is pressed, device is waking-up from power-down mode and start scrolling text equivalent to pressed button. 4 text’s are saved in eeprom memory, each one can be 127 character length (128 cell is used for holding special end-char).

Elektronic business card 85 LED – [Link]

6 Jun 2011

High-power flashlight version of TV-B-GONE (v1.2). It uses 1W infrared emiter diode, 940nm wavelenght. Note that other wavelenght (like 850nm) will strongly decrase range of device. Led requires a collimator, i have used 25*. Note that if you want to shoot from higher distance you must put a 15*, and 45* for switch-off mane tv’s at once. Supply as in original flashlight, 3x AAA batteries. Resistor R1 is for region select, solder for EU or leave-it for US. PCB diameter is 20mm, can be sawn to 18mm.

High-power TV-B-GONE flashligt – [Link]





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