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Heart rate measurement from fingertip

Posted on February 5, 2011 by R-B 841 comments

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 variation of the blood volume inside a finger artery, which is caused by the pumping action of the heart. It consists of an infrared LED that transmits an IR signal through the fingertip of the subject. A part of this infrared light is reflected by the blood cells. The reflected signal is detected by a photo diode sensor. The changing blood volume with heartbeat results in a train of pulses at the output of the photo diode,

Digital alarm clock using PIC

Posted on January 31, 2011 by R-B 4 comments

This project describes a digital clock with alarm function. It uses a PIC16F877 microcontroller to generate an accurate 1 sec delay with Timer0 using Roman’s zero error method. The time is displayed in large size font on a 4×20 character LCD that uses HD44780 display driver. You can synchronize the time with your computer time through a serial port. The required power is provided through a 9 V wall adapter which is used to obtain a regulated +5 V power supply using a LM7805 IC. The microcontroller runs with a 20 MHz external clock. The backlight of LCD is driven by

VGA monitor tester

Posted on January 21, 2011 by R-B One comment

If you are a computer technician and want to avoid the need of a PC on your desk to generate test rasters, this is something you need to build. This is an embedded monitor tester that you can use to test if a VGA monitor is working or not. You don’t need a bulky computer on your working desk anymore.

A physical display device for website visitors based on Atmega168

Posted on January 20, 2011 by R-B Leave a comment

If you have a blog or website and want to make a physical device to display the number of visitors, this project might be interesting to you. It describes about a similar device that can be directly connected to the internet via router and counts the visitors of your website. The number of visitors is displayed on seven segment LEDs.

Arduino: Digital energy monitor for your house

Posted on January 18, 2011 by R-B One comment

This project describes a whole house energy monitor that provides quick access to current energy use information, usb datalogging for detailed long term data storage and Internet connectivity for online graphing. The display unit uses four seven-segment LED displays that shows real power, apparent power, power factor, RMS voltage, RMS current, frequency and cumulative KWH consumed.

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