Heart rate measurement from fingertip

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.

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Lessons for first time Propeller Programmers

If you are looking for beginner's lessons on Propeller microcontroller, these tutorials will be very helpful.

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Digital timer relay switch

A programmable digital timer switch based on a PIC16F628A microcontroller. You can set both on and off time using push button switches. The program menu, and time information is displayed on a LCD screen.

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Digital Temperature Meter using PIC16F688

A digital temperature meter based on PIC16F688 microchip and DS1820 temperature sensor that displays temperature on Celsius and Fahrenheit scales.

Very cool project, firmware written in mikroC compiler.

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40x7 Running Message Display using PIC Microcontroller

LED matrix message displays are really cool. Here is one based on PIC microcontroller that displays time, calendar, temperatures, and, text messages. It can store for up to 10 messages, each 250 characters long, and supports both static and running messages. Message selection can be done through an IR remote control. The brain of this device is a PIC18F252 microcontroller and uses 16-bit serial-in-parallel-out shift registers to drive the LED columns. It operates with 12-24 V DC power supply.

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