This projects describes an optical method to measure heart rate through fingertip. The volume of blood inside the finger artery varies with heartbeat. When an infrared light is passed through the fingertip, the amount of light absorbed is directly related to the blood volume. A photodiode senses this change in absorption and the signal is amplified further with a two stage filter/amplifier. The microcontroller reads the output from the amplifier and display the heart rate on a 3-digit seven segment LEDs.
Saturday, February 5, 2011
Wednesday, January 5, 2011
Thursday, September 30, 2010
A digital temperature meter based on PIC16F688 microchip and DS1820 temperature sensor that displays temperature on Celsius and Fahrenheit scales.
Posted by Raj at 7:38 PM