301 Moved Permanently

Posted December 29, 2011 by Chris

“I started this project more to gather some experience with FPGAs, rather than to design or own such a device, but it ultimately developed into a complete design, consisting of several boards.” The design is not over complicated and it’s a great example of how a simple FPGA project can turn into a useful tool for audio processing.

Posted December 28, 2011 by Chris

“So here is the strategy: for a Softrock-class radio, we will use a phase-locked loop (PLL) that tunes using a resolution of 8kHz, say, and which might lock onto the frequency a little slowly. We will do this by dividing a crystal oscillator down to 8kHz, dividing a variable frequency oscillator by some integer so that it produces 8kHz when tuned to a desired frequency, and lock them.”

Posted December 27, 2011 by Chris

“The Glove Mouse is a former 6.111 [digital electronics lab] project by Tony Hyun Kim (EECS ’09) and Nevada Sanchez (EECS ’10), in which we demonstrated intuitive control of a map application using only one’s hands. We liked the project so much, that we kept it alive during our free time even after the class. Most recently, we upgraded the gloves with wireless transmitters in March 2010.”

Posted December 26, 2011 by Chris

“In the heart of the D1 radar sensor is a radar chip based on UWB radar technology from Novelda. An UWB radar sensor sends out EM pulses and looks at the pulses that are reflected back. When an EM pulse hits the wall in the video above, a part of the pulse is reflected back to the radar and a part of it penetrates the wall and is reflected from the cabinet behind the wall.”

Posted December 25, 2011 by Chris

Merry Christmas 2011

Posted December 24, 2011 by Chris

“This article introduces an implementation of a simplified filtering algorithm that was inspired by Kalman filter. The Arduino code is tested using a 5DOF IMU unit from GadgetGangster – Acc_Gyro . The theory behind this algorithm was first introduced in my Imu Guide article.”

Posted December 23, 2011 by Chris

“My implementation produces 640×480 signals, but the display is limited to 80×60 blocks…the HCS12 bus can run at 25MHz max, and it takes at least 5 bus cycles to write a byte to an I/O port. For normal VGA, pixels must be written out at a rate of 25MHz.”

Posted December 22, 2011 by Chris

Today’s article shows you how to build a basic wireless input and output system in the form of a single transmitter and single receiver. Communication is one way to keep things simple with two xbee modules being used for the wireless link. In the end, a small trimpot will control the movement of a servo motor.

Posted December 21, 2011 by Chris

“This project is based on obdev’s RemoteSensor and their firmware only USB implementation, the main change is the replacement of the analog sensors with a SHT11 digital temperature and humidity sensor. The sensor unit consists of an ATTiny45 MCU, a SHT11 sensor, and a hoperf RFM12 868 MHz transceiver module. It is powered by 2 AA cells and is expected to give >1 year of battery life.”

Posted December 20, 2011 by Chris

“In previous and parallel work with autonomous airships we gained experience with UAV control and autonomous navigation. Compared to airships, the multirotor UAVs we use in one of our current projects are of course much smaller and can carry much less payload. On the other hand, due to their size, they can be deployed a lot faster and do not require any preparation except for connecting the batteries.”