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Single-lead Heart Rate Monitor Analog Front End

Analog Device’s  AD8232 is an integrated signal conditioning block for ECG and other biopotential measurement applications. It is designed to extract, amplify, and filter small biopotential signals in the presence of noisy conditions, such as those created by motion or remote electrode placement. This design allows for an ultralow power analog-to-digital converter or an embedded microcontroller to acquire t ...

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8-bit MCUs That Can Operate Under 1.8 V

Sleep modes and idle modes in general-purpose microcontrollers have allowed embedded processors to reduce real-time energy consumption and tackle many battery- and low-powered designs. However, as embedded systems become increasingly complex, it takes additional logic to implement a denser, more sophisticated micro core as well as the higher-end peripherals we expect to see today. As a result, even in stand ...

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Infrared Communications for Atmel Mega644-1284 microcontrollers

Introduction Infrared (IR) can be used for line-of-sight communications over low to moderate range. IR is nice because of the lack of interference (except for sun and compact fluroscent lights) and freedom from FCC regulation. The web site http://tthheessiiss.wordpress.com/2009/08/05/dirt-cheap-wireless/ (Jacob Sikker Remin, 2009) shows how to use a IR remote control receiver and IR LED to send ASCII serial ...

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Mood vase

I'm a fan of LEDs, lots of LEDs.  So here's a slightly less crass way of using LEDs for decorative purposes.While this is by no means a neat and polished solution, and probably not the first of its kind, however the pulse effect is as far as I have seen unique, and exactly what I wanted.  I hope that this will inspire others to create similar. The set-up It consists of a plain, unmodified vase, and a small ...

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Engadino

This project is named "Engadino" after Engadin - ski resort in Switzerland. The reason for this is that I live in Switzerland, I like skiing and the name is easy to remember and pronounce. By itself the project is a clone of "Pinguino". "Pinguino is an Arduino-like electronics prototyping platform. It supports different 8- and 32-bit ©Microchip microcontrollers, all with built-in USB module (no FTDI chip !) ...

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Charge a nickel-cadmium cell reliably and inexpensively

Rechargeable NiCd (nickel-cadmium) cells are widely used in consumer devices because of their high energy density, long life, and small self-discharge rate. As a part of one project, I needed to design a reliable and inexpensive charger for a battery pack containing two NiCd AA-size 1200-mAh cells. In the process of the charger design, I needed to solve two main problems: first, setting a proper charge-curr ...

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Build your own (at)tiny colour sensor.

A few months ago, I saw an instructable by fjordcarver on how to build a coloursensor with an RGB led and an LDR. It inspired me to try whether I could improve his design. Here are the things that I wanted: The sensor should have as few pins as possible. It should work as a stand-alone device. All calculations should be done on the device. It should have a triggered mode and a continuous mode. All parameter ...

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