Another useful application for a LED dot matrix display, well useful for those who use twitter. The purpose of the project is simple, it scrolls your twitters on the led matrix, this way you don’t have to be in front of your computer to see what’s new. Source codes and info about building it is provided by the author. The matrix is controlled by an Arduino
Physical LED Twitter Scrolls Your Twitters: [Link]
If you’re asking yourselves how to connect a solar panel to an Arduino you will find this project useful.
Hook a solar panel to your Arduino: [Link]
John Ryan on the Arduino forums says:
Here’s 2 ATMega168’s sharing one 16mHz resonator, one reset switch, two 10k resistors, one 220ohm resistor, and two LED pilots. I used a mini USB adapter and uploaded the LED blink test to both chips, and as Paul [Badger] suspected, they are perfectly synchronized - I’ve tested numerous resets, and the start up blink sequence and blink demo on both, are identical.
I don’t need synchronized chips, but I happen to have a use for 2 168’s connected via i2C - not sure if anyone else does but it adds a lot of pins and a second serial buffer for an almost next to nothing outlay. This can be put together using 1 RBBB and a second chip with the boot loader installed, so that’s quite inexpensive, so long as you’ve got got a mini USB adapter laying around.
Ladyada released this great tutorial on how to connect a parallel LCD to an Arduino. I’m sure this will prove useful to many people, because more and more projects are LCD based, and until now there wasn’t any good tutorial out there on hooking up an LCD. I don’t know if you noticed too, but simple LED projects are not surviving these days, people like LCD’s and interacting with them.
This project consist of an 8×8 LED grid controlled by the Arduino. The result is a particle effect, a particle that bounces around the LED matrix. But the arduino only has 13 outputs, so you can only control 13 LEDs? Well, the author discovered that trough Charlieplexing which is a complicated mode of wiring LED’s you can actually drive more LED’s with fewer outputs.
Arduino LED particle system: [Link]