Posted September 2, 2014 by Chris

"Here is a method for making an encoder with two sensors for your application. If you only need speed sensing, you may want to skip down to the construction section. The important variables are the radius of the circle (r), the distance between the two optical sensors (s), and the number of divisions in the wheel (d). …."

Posted September 1, 2014 by Chris

"WireGarden is a simplified way to interact with sensors and other hardware. It is based on the Arduino platform. The WireGarden system has four main parts: Hardware, Arduino Software, Communication and User Software."

Posted August 29, 2014 by Chris

"Abstract: Measure the temperature with one or more LM35DZ or DS18B20 temperature sensors, and then publishes the result when the value changes or every 20min. There is also a alarm function when the value goes higher/lower than the alarm limits."

Posted August 25, 2014 by Chris

"An IR sensor is a device which detects IR radiation falling on it. There are numerous types of IR sensors that are built and can be built depending on the application."

Posted August 3, 2014 by Chris

"This is development board designed by me for the ATmega8 microcontroller. It is a miniature ARDUINO. You can burn your bootloader and then use with Arduino IDE or you can simply upload your hex file using DAPA programmer circuit."

Posted July 11, 2014 by Chris

"This is a conduction tester to check the connection on the built proto-board. Normally a circuit tester is used to check the conduction. But it is not suitable to check if wired or not in the circuit board with mounted parts because the semiconductor parts in the circuit become conductive under test voltage."

Posted July 8, 2014 by Chris

"The purpose of this project was to design and implement a digital stethoscope to serve as a platform for potential computer aided diagnosis applications for the detection of cardiac murmurs. The system uses a custom-built sensor to capture heart sounds at 8 kHz and converts them to electrical signals to be processed by an ATmega644 microcontroller."

Posted July 7, 2014 by Chris

"My first Physical Computing class assignment for this summer was to create a bicycle computer. This is a device that you stick on your bike and it tells you how fast you are going, what your speed is, etc. Following is how I made my own bicycle computer."

Posted June 30, 2014 by Chris

"Contact-less measurement of RPM will be achieved through an IR sensor. An IR diode will send a beam of infrared towards the rotating disc, and any reflected pulse will be received by a photo diode. The resistance of a photo diode drops drastically when exposed to infrared. An infrared is reflected by a white surface and absorbed by the dark ones."

Posted June 28, 2014 by Chris

"This article explores the suitability of a Wii nunchuk based USB accelerometer as an earthquake sensor for the Quake-Catcher Network (QCN) project. It examines the nunchuk over several metrics: precision and range, frequency response, total cost and availability."