Think & Create

Dandelion’s preliminary library for Processing

by on Sep.24, 2011, under Uncategorized

It may still be confusing to write and read the commands of dandelion. So I released this library. It has packed all calculation needed for dandelion. All you need to do is call the methods in the library can read its value.
Here is a picture of how to install the library. Open the “Processing” folder in “Documents”. If the “Libraries” folder does not exist, create it. Then put the dandelion folder in it.
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Dandelion introduction

by on Sep.21, 2011, under Uncategorized


Dandelion is a project inspired by Gainer. It proves a simple solution to interact between the physical world and the digital world. When connecting the board to a computer, it acts as a serial port on the computer. That makes it easy to be manipulated by any program language. Then various sensors or actuators can be connected to its 10 digital IO ports and 2 analog input ports. All commands and data are sent in ASCII forms and those commands are user-friendly. Most important, it connects via Bluetooth. This can save a USB port and communicate in distance. Also it is an ideal platform to develop Android related gadgets. (continue reading…)

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Dandelion setting up tutorial for Mac OS X

by on Sep.21, 2011, under Uncategorized

The method is quite similar to setting up a normal Bluetooth serial module. You may also refer to
http://www.rioleo.org/setting-up-the-arduino-pro-mini-and-bluetooth-mate-on-mac.php

First of all you need to have you Bluetooth enabled. Then click on the bluetooth icon on the menu bar and choose “Set Up Bluetooth Device”.
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Digital Smart Ruler—when Euler circuit meets electronic circuit

by on Jul.21, 2011, under My gadgets


Higher quality of pics will be available soon.
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Dandelion Bluetooth IO interface

by on May.25, 2011, under My gadgets

Dandelion is a project inspired by Gainer. It proves a simple solution to interact between the physical world and the digital world. When connecting the board to a computer, it acts as a serial port on the computer. That makes it easy to be manipulated by any program language. Then various sensors or actuators can be connected to its 10 digital IO ports and 2 analog input ports. All commands and data are sent in ASCII forms and those commands are user-friendly. Most important, it connects via Bluetooth. This can save a USB port and communicate in distance.
(continue reading…)

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Sigma Delta DAC DDS

by on Mar.13, 2011, under My gadgets

To build a DDS we need a DAC. As a hobbyist DDS, R2R Resistor Ladder Networks or PWM is often used. PWM waves generated by a built-in module in the micro-controller may be the most simple and cheap choice. But when we have to generate the wave with our own code, we can also choose the Sigma Delta modulator to convert the N-bit PCM data to one-bit PPM stream for output.


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8pin AVR fuse resetter

by on Dec.26, 2010, under My gadgets

An 8pin AVR only has 5 IO pins in default which is not enough in some applications. The reset pin can be treated as the additional pin at the cost of disabling the ISP function. Then the chip can only be programmed by a High-voltage Serial Programmer. So this device is useful to reset the fuses in AVR and enable them to be reprogrammed again.
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Pepper Protocol Analyze

by on Dec.25, 2010, under My gadgets

Pepper is tiny IO board using USB. It is compatible to Gainer, which can be easily controlled by Flash, Max/MSP or Processing. The Pepper is a good choice to link the computer and the physical world without concerning the programs outside the computer. It is more efficient than Arduino in some simple applications.
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Experience “Octave illusion” with Arduino

by on Dec.21, 2010, under My gadgets

The original design is on Elektor, “Ear boggle”. In that case, a 40106 is used to output alternating square waves. Although that circuit is simple, it can be ever simplified by using a micro-controller. I used an Arduino board to output the sound in sine wave form which is the same to the original experiment by Diana Deutsch. In addition to the Arduino, two resistors, two capacitors, a 3.5mm jack and an earphone are all we need.
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Digital variable resistor

by on Nov.28, 2010, under My gadgets

Resistors are essential parts in a circuit. When we prototype our ideas, we need various kinds of them. But it is annoying to put the resistors back to their original pocket after the experiments and it is a bit wasteful to put them in trash bin. With this digital variable resistor, the problem is solved.
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