– Download as PDF File .pdf), Text File .txt ) or read online. Electronic theory, schematic circuits and PIC tutorials. Like other multiplexing techniques (eg matrix), charlieplexing is used to control more loads The two LEDs are connected anti-parallel, the anode of the red LED (left) is. The term “Charileplexing” is not a familiar one for many electronics hobbyists. Charlieplexing is a technique proposed in early by Charlie Allen (at.

Author: Yozshuramar Kerr
Country: Suriname
Language: English (Spanish)
Genre: Science
Published (Last): 26 September 2010
Pages: 244
PDF File Size: 14.60 Mb
ePub File Size: 8.47 Mb
ISBN: 434-6-33092-351-7
Downloads: 15586
Price: Free* [*Free Regsitration Required]
Uploader: Akigul

In your living room, the big display is what you want. But in an embedded project, often less is more. You can see them in action, scrolling to some disco music in the video below. A little side-mounted header makes it easy to program the chip if you want to change anything. What makes a game a game? And how do we know how to play it? This state machine sleeps until one of the two buttons is pressed, at which time a wait animation starts.

The action begins with the next button press. Game play across only five LEDs makes for some pretty intense action, too. Fortunately, the buzzer is a big part of the experience.

It sounds one tone for each LED when the ball is in play, and a different tone to confirm button presses. For a study in minimalism, there sure is a lot going on here with all the different tones and animations.

If dungeon crawlers with satisfying hardware are more your thing, you really need to check out Twang. This simple game uses four buttons, four LEDs, and a small speaker.


The player moves in the four cardinal directions using buttons, and the LEDs show walls and corridors. If an LED is lit, it means the path in that direction is blocked by a wall, and attempting to move in that direction will make a beep. When the player reaches the exit, a short victory tune chirps from the speaker. The solution was to dedicate one pin to the speaker and the other four to charlieplexingwhich is a method of driving more LEDs than you have pins.

It takes advantage of the fact that most microcontroller pins can easily switch state between output high, output low, or low-impedance high-impedance input. As for the buttons, [David] charlieplexed them as well. A closed switch reads low on the input, and an open switch reads high.

Charlieplexing 8 LEDs – trouble generalizing routine

With charlieplexing, four pins is sufficient for up to twelve LEDs or buttons in any combination, which is more than enough for the Secret Maze. At the time, he was also fascinated by Charlieplexing — an awesome technique that either allows one to control multiple polarized components, such as LEDs, simply by connecting them in a specific way. Drawing inspiration from Charlieplexing, he came up with the idea to connect things in such a way that every node is connected by one connection to every other node — a complete graph from theorry topological view point this makes so much more sense visually.

Now, there is a balance to everything, and while this system can determine the resistance of. So good, in fact, that [daqq] is chharlieplexing published in Circuit Cellar! We love to see theory in the hacker chxrlieplexing, so keep it coming! Charlieplexing is a bit of a dark art around these parts. The theory is one thing, implementation is another.


Somehow, [bobricius] managed to fit LEDs on a PCB, all while managing to break out those signal wires to a sensible set of pads on one side of thhe board.


Only eleven charlieplexong are required to drive all these LEDs, making this project a great foundation for some very cool wearables or other projects that require a bright, low-res display. Both are great little boards, and the perfect solution for tiny displays for low-pin-count micros.

Building an electronic dice using an ATtiny10 with code that fits within 1kB is not too difficult. A third GPIO is used as a touch button input.

The Charlieplexing

Only the logic states used are listed in the table. If you have a cool project in mind, there is still plenty of time to enter the 1 kB Challenge! Deadline is January 5, so check it out and fire up your assemblers! By charlieplexiing our website and services, you expressly agree to the placement of our performance, functionality and advertising cookies.