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nRF51822 with Arduino development

by on Nov.20, 2016, under My gadgets

This is my experiment of burn bootloader on nRF51822 and upload code with serial cable and Arduino IDE.


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WebBluetooth With CC2541

by on Nov.20, 2016, under My gadgets


This project shares my experience with WebBluetooth with Bluetooth hardware (CC2541 – Texas Instruments)

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Blink an LED the hard way

by on Nov.21, 2014, under Uncategorized

Here is an example of using Arduino Due’s usb host port. The USB device is also an Arduino so repeat this experiment will be easier. The Arduino Leonardo is running LUFA’s Generic HID demo. If you don’t want to set up toolchain for LUFA. There is a pre-compiled hex file for Leonardo. Please notice this demo will take over USB and you have to reset your Leonardo to enter bootloader again. The Due side code can be compiled and uploaded with Arduino 1.5.8 directly.


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Phosphorescent message card

by on Feb.02, 2014, under My gadgets

Visualize hidden message with a phosphorescent card.


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Google Glass controlled flashlight

by on Dec.05, 2013, under Uncategorized

This is an updated version of flashlight on Google Glass. This flashlight get power and control signal from Glass’s micro-usb Port. A glassware can be voice activated to toggle the flashlight. However USB OTG (USB host) function requires root in XE11. More information on Github:

Photo Dec 05, 1 34 58 AM

Photo Dec 05, 1 33 37 AM (continue reading…)

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Plastic push-in rivets fastened laser-cut box

by on Nov.24, 2013, under Uncategorized

This is a laser-cut acrylic box that fastened by plastic push-in rivet.


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ftdi processing

by on Oct.07, 2013, under Uncategorized

A recompiled JD2XX library that can work with processing. Using FTDI API can send and receive data at a much higher speed than Virtual Com Port. This works well with Arduino Duemilanove (ft232).






Some dll is needed in java/bin in processing’s application folder.

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Google glass talks to Arduino and Raspberry Pi

by on Jul.09, 2013, under My gadgets

Use Google glass voice command to control a LED on Arduino and Raspberry Pi via XMPP messages.

Try it:  Source code:

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Directional Speakers

by on Jan.25, 2013, under My gadgets

This speaker modulates audible sound on ultrasonic signal and send the modulated sound in a beam through the array of piezo speakers. The sound will be demodulated with the non-linearity of air itself and can be heard right in front of  the speaker. The case is made by laser-cut cherry wood. A small laser diode is used to indicate the path of sound.

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Branch Light

by on Jan.25, 2013, under My gadgets


Branch Light is designed as a new form of mood light. Normally mood light is a single light or a light strip that you can not change it’s shape easily. This modular mood light units use magnets to connect each other so they can be rearranged easily. It is ideal for decoration under table or on vertical surface like refrigerator. The magnetic connection provides mechanical, power and signal connetion. (continue reading…)

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