by CsabaP @ instructables.com:
This Instructable shows you how to build a clap activated LED strip. The whole project is based on the Adafruit’s Secret Knock Activated Drawer Lock, where the user can record a secret knock pattern which will open the lock inside the drawer. I thought that I could use this to siwtch an LED strip on and off with a handclap pattern. So let’s begin!
Clap activated LED strip - [Link]
Impress your friend with the ultimate geek’s Birthday Cake! A hand-made open source electronic cake with candles you can blow out!
- Features 9 LED candles that you can blow on, to make them flicker and go out, like you do with a real birthday cake! Each candle blinks with random period and phase that depends on the intensity of the air flow
- Piezo sensor and a special air trap to detect air flow with astounding sensitivity using resonance effect
- Atmel ATTiny44 microcontroller on board with 4 kilobytes of flash memory and 256 bytes RAM
- Open source hardware and firmware. Can be re-programmed with an ICSP programmer or Arduino board via Arduino IDE
- Size 42 x 42 x 18 mm, weight 26g
- Powered by a single AAAA/LR61 battery (included)
- 3.3V step-up converter on board
- Ultra low shutdown current (less than 1 uA in deep shutdown)
- Hand-soldered using lead-free solder
BitCake – Electronic Birthday Cake - [Link]
by Rui Santos @ randomnerdtutorials.com:
If you want to learn more about the ESP8266 module, first read my Getting Started Guide for the ESP8266 WiFi Module. In this project you’ll create a standalone web server with an ESP8266 that can toggle two LEDs.
Why flashing your ESP8266 module with NodeMCU?
NodeMCU is a firmware that allows you to program the ESP8266 modules with LUA script. And you’ll find it very similar to the way you program your Arduino. With just a few lines of code you can establish a WiFi connection, control the ESP8266 GPIOs, turning your ESP8266 into a web server and a lot more.
ESP8266 Web Server Tutorial - [Link]
by Donald Schelle @ ti.com:
Achieving optimal performance of an LED luminaire or LED backlight design requires numerous trade-offs. Understanding an LED’s power transfer characteristics empowers intelligent choices regarding cost, power consumption, and weight. While most LED datasheets publish pertinent data that can be used to make these decisions, data may not be formatted in a way that is readily applicable to the chosen application. Optimal performance requires finding pertinent information from manufacturer’s LED datasheets and utilizing methods to capture, reformat and analyze the data.
Optimal operating point of an LED - [Link]
by Henry Tonoyan @ htonoyan.blogspot.gr:
Last week I had the idea to create a last-minute valentine’s day gift for my girlfriend. I had a bunch of WS2812 LEDs from my previous endeavors and decided to make a big LED heart. These are a great choice because of the very minimal amount of components necessary: no I/O expanders, driving transistors or ICs necessary. Plus you just need one I/O line from your microcontroller to drive them.
Since they run off 5V, I planned to create a board that is powered from a wall-wart power supply. That way the board doesn’t even need a voltage regulator on it. I chose to use an ATMega48 because I have several from previous projects.
A Valentine’s Day Surprise - [Link]
Markus Gritsch shared his WiFi LED light project in the dangerousprototypes forum:
I built a prototype for a WiFi controllable LED light, using the popular ESP8266 module running the NodeMCU firmware . To allow controlling the WS2812B LEDs from Lua, I extended the firmware with a bit of C code
WiFi LED Light (ESP8266 + WS2812B + Lua) - [Link]
by Rusivan @ instructables.com:
In this article I will try to tell you about the gift I made for my girlfriend!
The basis of the scheme is a microcontroller Atmega8, 1K resistor, selected in such a way as not to overload the microcontroller ports. SMD resistors and diodes, size 1206.
On the reverse side of the board, there are two batteries CR2032, two capacitors, voltage regulator LM7805, and the power button with latching.
DIY SMD LED heart - [Link]
by SteveQuinn @ instructables.com:
For those of you who remember the eighties, this will no doubt bring back fond memories when every piece of audio equipment in the known universe was at the time equipped with a plethora of LEDs.
More specifically the ubiquitous Graphic Equaliser or ‘Graphic EQ’.
This Instructable is centred around the MSGEQ7 to create a simple 2 Channel Graphic EQ and documents my first, poor attempt at using the Arduino Uno R3, the Arduino development environment and coding in ‘C’ for well over a decade.
LED Graphic Equaliser from the 80s - [Link]
by Colin Jeffrey @ gizmag.com:
Researchers from the University of Manchester and University of Sheffield have developed a new prototype semi-transparent, graphene-based LED device that could form the basis of flexible screens for use in the next-generation of mobile phones, tablets and televisions. The incredibly thin display was created using sandwiched “heterostructures”, is only 10-40 atoms thick and emits a sheet of light across its entire surface.
Flexible graphene-based LED clears the way for flexible displays - [Link]
by Phil Townshend @ edutek.ltd.uk :
A nifty 32×7 dot matrix display module, programmable via an RS232 serial port. There are preset inputs to display preset messages or simply control directly from a PC or laptop.
The principle of the display is based on our persistance of vision, the same thing that enables us to watch movies without seeing the flickering changes of frame. This display has 32 LEDs horizontally by 7 vertically. At any one time there is only ever one column of LEDs lit. The on’s and off’s are presented to the anode connections while the columns are enabled one by one. In this way a dot display of characters can be generated and when the speed is increased sufficiently, we stop seeing the flickering and see it as a steady display of dots.
LED Dot Matrix Display - [Link]