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Real-time sound spectrography using Atmega1284

Posted on December 18, 2014 by R-B One comment

A sound spectrogram is a visual representation of the frequency components contained in an audio signal. The device that generates the spectrogram is called spectrograph. In a spectrogram, the horizontal axis is time and the vertical axis represents frequency. The spectrogram is color coded or gray-scaled to represent the relative intensity of the sound in each frequency region and time. Some of the applications of spectrograms are speech analysis and enhancement, studying bird and animal calls, music formation, etc. During pre-computer era, the spectrograms were generated using analog techniques that involved a series of bandpass filters. With the advent of

Gesture glove to vocalize sign language

Posted on December 17, 2014 by R-B 2 comments

The Fall semester of 2014 is now over and we get to see some new and exciting embedded projects from students of Cornell published on Bruce Land’s ECE4760 class website. Monica Lin and Roberto Villalba have made a gesture glove for people with hearing disabilities. This device is intended to help them to better communicate with other people by converting their gestures into speech. For their project, they used five flex sensors to sense and quantify the bending of each finger, and the MPU-6050 (a 3-axis gyroscope and a 3-axis accelerometer) sensor to detect the orientation and rotational movement of the hand.

Turning an old Ardroid phone in to a WiFi webcam for remote monitoring

Posted on December 16, 2014 by R-B Leave a comment

If you have a spare Android phone lying around somewhere with no use, you would probably need to read this Instructable to turn it into an useful WiFi-enabled webcam that could be used for remote monitoring. The author explains the technique with Motorola Droid Razr Maxx Android device, and uses IP Webcam App for video feeding. IP Webcam allows you to view the WiFi webcam video inside your WiFi network without connecting to internet, as well as outside the WiFi through VLC player or web browser. The instructable describes well how to setup a permanent local IP for your phone

TrH Meter kits are back in stock now

Posted on December 13, 2014 by R-B Leave a comment

TrH Meter is a DIY digital room thermometer plus hygrometer that displays temperature and relative humidity on 4 large (1 inch) seven segment LED displays which adjust their brightness level according to the surrounding illumination. It consists of a closed loop system that continuously assesses ambient light condition using an inexpensive light-dependent resistor (LDR) and uses that information to adjust the brightness of the display. An inexpensive DHT11 sensor is used to measure temperature and relative humidity. You can buy a complete TrH Meter kit with a preprogrammed PIC microcontroller from our Tindie store. Note: New kits come with Red

Active IR gesture sensing

Posted on December 10, 2014 by R-B Leave a comment

From Silicon Labs’ application note on IR Gesture Sensing: Touchless user interfaces are an emerging trend in embedded electronics as product designers seek out innovative control methods and more intuitive ways for users to interact with electronics. Active infrared proximity motion sensing can solve this challenge. Silicon Labs Si114x proximity and ambient light sensor products are ideally suited to touchless gesturing applications such as page turning on an e-reader, scrolling on a tablet PC, or GUI navigation. The Si114x features up to three LED drivers and has the ability to sense gestures within a 7 to 15 cm product interaction region, assuming a hand as

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