Using three pins to drive three LEDs and read three buttons

Sometimes in more complex projects it is a waste to dedicate a line for every LED or button. If you thinking of selecting bigger microcontroller because you need additional pin to drive LED, think of smart way out. Francois AUGER & Philippe Fretaud have shared their technique of interfacing three LEDs and three buttons with three I/O pins. They used special Charlieplexing method of connecting all together and then wrote code piece to drive LEDs and read buttons. Three additional diodes allow reading buttons without affecting other components. Using three additional diodes is way more efficient than expanding number of pins. See video bellow of live action. Continue reading

The Outstanding Arduino Strobe Algae Bioreactor

We all knew that Arduino is definitely a very special electronic device, as you can do many incredible electronic projects with a simple arduino! Well, if you’re looking for a home décor, but you don’t want to spend huge money out from your wallet, maybe this fantastic Arduino Strobe Algae Bioreactor is your ideal choice. Why? Believe it or not, the Arduino Strobe Algae Bioreactor is only cost you about $60 and less than three hours to accomplish it! Honestly, you don’t need to be an expert to build this project, as it only require basic power tools. For your information, algae has been recognized as one of the most potential environmental friendly powers, where many researchers have been involved in the algae experiment to cultivate the unknown parts of algae. In this project, it’s a very easy one, where you use a platform for one technique that is broadly used with to trick the algae into reproducing. The algae species reacts differently in many ways to its environment. You can create a microcontroller platform that can be variably set… Continue reading

The RGBike POV is The Right Choice for All the Beginners!

You know what, most children (Even the adults) love something totally different than other, as it making us feeling cool and outstanding! If you’re the parent of the kids, and you would like to reward them for being a good child, then might be this RGBike POV is the right choice! Why this RGBike POV is special from the others? Well, with the full color POV, which is capable of displaying text, images and small animations on it, it’s very hard to resist this beauty! For this project, it uses 16 RGB LEDs on a single layer board printed circuit board. To be honest, this open source project is entirely through-hole design, which is making the whole assembly becoming easier! Beside that, you need to use a Hall Effect sensor, as this for synchronizing the image display. Since the ATmega328p microcontrollers are being used in this project, so it makes the whole thing arduino compatible. The RGBike POV is fitted the 26” wheels perfectly, but it also have the downfall, as only one side of the wheel is illuminated. In… Continue reading

Marquee LED Array Display is Marvelous!

You have nothing else to do during the weekend and you don’t want to waste your time wandering at the shopping mall? Hmm, maybe this Marquee LED array display can keep you busy for a while! If you think that this Marquee LED array display is nothing, but an ordinary LED display, then you’re totally wrong here! This Marquee thing is allowing you to keep up to date on incoming emails, news, daily weather or even the stock/forex quotes. Ok, first of all, you have to prepare 120 LEDs, where the LEDs will be used to build an array display. Beside that, you need to learn how to control them all from one microcontroller, also the correct ways to talk to it from your computer (Don’t worry, the video clip on the below will show you step by step how to deal with this gigantic Marquee LED array display!) This project is makes use of row-column addressing, thus it will let you to control many LEDs without having one wire going to each one. Beside that, if you want to… Continue reading

RFDisplay – The Magnificent Display with RF Connection to a PC!

Have you ever thought that you can use some of your imagination to build something out of a large array of lights? However, you might think it’s pretty hard, as you didn’t sure how to connect a large number of them, especially when microcontrollers don’t have enough output pins for each light here? Well, your worries seem to be useless here. Do you know that the same persistence of vision tricks that are used to make a CRT display work could also be applied to LEDs in a grid pattern and there is an automated weather station that can be used to send weather data to the display from via a RF link? With these features, you can simply build an incredible RFDisplay! Basically, the main concept behind persistence of vision is that if a bright light is flashed the light will be perceived as being lit for a long time. As a result, if the light is flashed fast enough (over 60HZ in this display), it will be perceived as being constantly on. The display uses this trick to… Continue reading

Arduinome – The Better Version of Monome!

Does anyone here love monome? For those of you that have deep interests on the monomer, then you’ve came to the right place, as today you will have the chance to get involved with Arduinome! For your information, Arduinome is the better upgrade version of Monome, where it’s actually a merge of microprocessor based hardware interface with development environment on the computer. In other meaning, this Arduinome is a clone of the original Monome with the use of an Arduino as its main brain! For your information, monomer is a small Philadelphia-based hardware company that specializes in making controllers for electronic music performance and new media art. Monome 40h is their first proud product, which it’s an eight-by-eight grid of backlit buttons that used to connect to a Mac or PC by simply using a USB cable and with the help of OpenSound Control protocol. About the Arduinome, it’s a more sophisticated upgrade version of Monome, where it has the following features, such as 8×8 bright LEDs, 8×8 arcade buttons, a well handcrafted box and the high quality Midi-out function!… Continue reading