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Easy Pulse board used as biofeedback for virtual jogging

Posted on April 1, 2013 by R-B Leave a comment

Sergej Stoetzer and two of his students just finished their virtual jogging project, where the Easy Pulse board has been used to provide a biofeedback to their system. They interfaced an ear-clip sensor to the Easy Pulse board to detect the heart beat during virtual jogging. The output of the Easy Pulse board goes to a Lego Mindstorms NXT-Brick, which in turn hits the Arrow Up key on a keyboard connected to PC. On the PC, a Google Street view is opened which moves forward every time the Arrow Up key is hit. So, the idea is to give you a

TrH Meter kits are back in stock at Tindie

Posted on March 10, 2013 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 for $26.00. Tindie buying link for TrH Meter kit.

SPI7SEGDISP8.56 kit is now available with blue seven segment LED displays

Posted on March 2, 2013 by R-B Leave a comment

SPI7SEGDISP8.56 is a MAX7219 based serial seven segment LED display module that allows you to add 8 digits of seven segment LED displays to your project using only 3 I/O pins, and provides full control of all the digit segments including decimal points. The LED display size is 0.56″ and all 8 digits are arranged into two rows of four. SPI7SEGDISP8.56 display kit is now also available with blue LED color. You can buy one for $13.50 on Tindie. SPI7SEgDISP8.56-1R Buying links: SPI7SEGDISP8.56 buying link – Red color SPI7SEGDISP8.56 buying link – Yellow color SPI7SEGDISP8.56 buying link – Green color SPI7SEGDISP8.56 buying link

I2C EEPROM plus Temperature Sensor breakout board

Posted on February 26, 2013 by R-B 3 comments

This tiny breakout board carries Microchip’s 24LC512 EEPROM and MCP9802 temperature sensor devices, both of which support I2C protocol. This board can be used for both sensing the ambient temperature and storing it. The MCP9802 is a digital temperature sensor with an user-selectable resolution from 9 to 12 bit. It can measure temperature ranging from -55°C to +125°C and notifies the host microcontroller when the ambient temperature exceeds a user programmed set point through its ALERT output pin. This board allows you to store up to 32000 temperature samples when you use the sensor in high resolution mode (12-bit, 0.0625°C)

New version of MAX7219 based 4-digit serial seven segment LED display

Posted on February 20, 2013 by R-B Leave a comment

This (SPI7SEGDISP4.40-1R) is a revised version of the previous SPI seven segment LED display (4 digit) board that displayed numerals and decimal points. The new version has a better quality seven segment LED display (LTC-4727JS) with three extra LED segments, as shown below. The additional colon segments are useful in projects where you need to display time (HH:MM or MM:SS).

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