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Search results: 18   Output: 1-10
  1. Alan Stummer Electronic Design By using a constant-current source along with a ratiometric DAC configuration, the output intensity of a laser diode can be carefully set and controlled using this simple circuit. This circuit was designed to meet a ...
    23-03-2017
  2. Martin Jagelka, Martin Daricek Martin Donoval EDN Continuous monitoring of heart activity permits measurement of heart rate variability (HRV), a basic parameter of heart health and other diseases. This Design Idea is a new design of pulse oximetry ...
    03-07-2015
  3. Part 1 - Theory and Schematic Operation of the board The operation of the board is very simple. After powering the board from a 3-5.5 V supply, the Enable (EN) pin must be pulled high to activate the IR sensor. Next, place the tip of your ...
    24-12-2012
  4. When I first built the Heart rate measurement through fingertip project, the infrared LED and photodiode used for finger photoplethysmography were actually from salvaged parts, and therefore, I could not provide specifications for them in the ...
    30-11-2012
  5. Part 1 - Features, Schematic and Demonstration Seeeduino Description Seeeduino is Arduino compatible board based on Atmel AVR ATmega328. Its design is based on Diecimila scheme, 100% compatible to its existing program, shield and IDEs. On the ...
    11-01-2012
  6. Description A customizable Breathalyzer that talks and tells you how much you’ve had to drink. It’s also open source and can easily be modified with your own text on the LCD screen and audio MP3 files. When tethered to a PC with a USB ...
    30-12-2011
  7. Part 1. Schematic Part 2. Software Output The use of this device is very simple. Turn the power on, and you will see all zeros on display for few seconds. Wait till the display goes off. Now place your forefinger tip on the sensor assembly, and ...
    28-03-2011
  8. Part 1. Schematic Software The firmware does all the control and computation operation. In order to save the power, the sensor module is not activated continuously. Instead, it is turned on for 15 sec only once the start button is pressed. The ...
    14-03-2011
  9. Introduction Heart rate measurement indicates the soundness of the human cardiovascular system. This project demonstrates a technique to measure the heart rate by sensing the change in blood volume in a finger artery while the heart is pumping the ...
    11-02-2011
  10. Audioguru Circuit Description: U1a operates as a low-noise microphone preamp. Its gain is only about 3.9 because the high output impedance of the drain of the FET inside the electret microphone causes U1a’s effective input resistor to be ...
    13-04-2010
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