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Introducing Easy Pulse: A DIY photoplethysmographic sensor for measuring heart rate

Posted on September 12, 2012 by R-B 165 comments

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 article. As a result of that it takes quite a bit of time to replicate that project with a different set of IR LED and photodiode as the values of the current limiting and biasing resistors may have to be changed for the new sensor to work properly. Today, I am going to talk about a revised version of the same project but with all the

Breakout board for PIC16F1847 microcontroller

Posted on August 9, 2012 by R-B 13 comments

This is an improved version of my 18-pin PIC16F series breadboard module that I have used in many of my PIC tutorials and projects published in this website. The new version has got a +5V power supply regulator on-board and a 2.1mm female barrel jack for DC input from a wall adapter. The 18-pin PIC16F series microcontrollers are still very popular among hobbyists and beginners because of their compact size, low cost, and simplicity. The PIC16F1847 is the latest release in this series and is equipped with lot more peripherals and enhanced features than its predecessors. This breakout board will be helpful

Building wireless sensor applications using Dorji’s DRF5150S and DRF4432S RF modules (Part 1)

Posted on August 4, 2012 by R-B 10 comments

Dorji Applied Technology is a China-based company that primarily focuses on building different types of RF modules that can be easily incorporated in designing wireless data loggers, sensor network, telemetry and other wireless applications. Their products mostly use RF transceiver chips from ADI, Infineon, and Silicon Labs. Some of their RF modules have an additional preprogrammed microcontroller that allows direct interface of selected analog and digital sensors to the module. This means you don’t need any external MCU or to write codes for these sensors. I have been playing with their DRF5150S and DRF4432S RF modules for past couple weeks

Intelligent temperature monitoring and control system using AVR microcontroller

Posted on August 2, 2012 by R-B 13 comments

Controlling temperature has been a prime objective in various applications including refrigerators, air conditioners, air coolers, heaters, industrial temperature conditioning and so on. Temperature controllers vary in their complexities and algorithms. Some of these use simple control techniques like simple on-off control while others use complex Proportional Integral Derivative (PID) or fuzzy logic algorithms. In this project I’m going to discuss about a simple control algorithm and utilize it intelligently unlike analogue controllers. Here are the features of our controller: Audio-visual setup for setting temperature limits. Fault detection and evasive action. Temperature monitoring and display. Audio-visual warning. System status. Settable

chipKIT Project 2: Temperature and relative humidity logger

Posted on July 13, 2012 by R-B 8 comments

This project is about building a PC-based temperature and relative humidity logger using the chipKIT Uno32 board and the DHT11 sensor. The project setup requires no additional wires (other than the USB cable) and components; the DHT11 sensor is directly plugged into four I/O pins of the Uno32 board and the project is ready to go. This could be a handy and an easiest way to setup an ambient room monitoring system for a server room. The Uno32 reads the temperature and relative humidity from the DHT11 sensor at preset interval and sends the data to PC through the USB-UART

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