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An SD-Cardreader with ATXMega16A4 who can read/write FAT16/32. The SPI works with 16MHZ. 1MB read in 4 Seconds and write in 19 Seconds with standard SD-Card. The FAT-Library from here: http://elm-chan.org/fsw/ff/00index_e.html is ported to XmegaVideo: http://www.youtube.com/watch?v=5K6KDO8dJYA

The new LPC810 from NXP is an ARM Cortex-M0+ based microcontroller in an 8-pin DIP package. It is also very cheap, although not as cheap as the NE555 in quantities (I quickly checked AVNET, the NE555 in a DIP8 package seems to cost about 10 dollar cents in volume). The NE555 needs a few external parts to work; the LPC810 has to be programmed, which of course adds to the production costs.

A while back, along with a bunch of yard sale electronic components, I received a box of AC adapters ("wall warts"). The voltage and current were were identified on some of them, whereas others had their ID tags damaged or missing entirely.

Ready to use for Breadboard. Small modules without wires : voltage regulator, 3 LEDs, pushbutton, potentiometer ...Voltage Regulator: small module that brings the power TO220 to the breadboard without wires but with a switch and an LED indicator. Mini-platinum: the same PCB for 3 leds or potentiometer or pushbuttun ... ready to use

A little circuit to try out the built-in I²C driver of the LPC810. Thanks to the Switch Matrix the I²C interface can be connected to the few available pins of the LPC800 Mini Kit board. The I²C driver is used in polling mode.

By Michiel Ter Burg See also http://www.luidsprekers.org/STA/. The goal was not to build a super Hi-Fi amplifier, but to see if it would be possible to build a reasonable amplifier using standard transformers.

A simple circuit for quickly testing model plane servos. The pulse width is controlled with P1. The circuit can be powered from 4 NiMH cells.This circuit can also be used as a sort of power potentiometer. Published in issue 439, July/August 2013

[This question has been answered, the solution can be found in the comments.]

Here is an article proposal that I feel would fit nicely in the summer issue, or perhaps before summer, as a solar panel charger is best used during the summer. The design has been tested as a prototype in our boat last summer and is now rolled into a more permanent design that I will install, come spring.

Many people feed garden birds in the wintertime with seeds, nuts and peanuts. But when the temperature gets below zero degrees celsius, water freezes and the birds don't have drinking water anymore. So it is a good idea to put a small can with drinking water in your garden too and … heat it to keep the water liquid.

1. Introduction

Many boilers are indirectly heated by the central heating unit. A three way valve directs the hot water from the normal circuit to the boiler spiral. When this valve leaks during normal heating, water is fed through the boiler spiral and cools the boiler. This will increase the number of boiler heating cycles. The effect is a high gas consumption.

This project is a wireless power transmitter, compliant with the WPC consortium's Qi specification for managed wireless power transfer.  Under this system, up to 5 watts radiated power is transmitted as an encapsulated AC signal through an air-coupled inductor.  This project uses the A11 class coil assembly to accomplish the transmission function.  For best safety at least 1m

In order to make use of the POQiRX, it is strongly recommended that a BLiVIT be in conjunction with this project.  The receiver can be used in a standalone configuration, but the BLiVIT has a space allocated to mount the receiver as a daughter board.

Published in Elektor Summer 2014 edition July/August.LED-Taschenlampen gibt es in verschiedenen Größen und Preislagen zu kaufen, so dass sich die Frage stellt, ob sich ein Selbstbau überhaupt lohnt. Aus der Sicht des Hobbyelektronikers sprechen einige Gründe dafür:

Das Projekt  ist eine kapazitive Steuerung auf Basis der Charge-Transfer-Methode im 'Pfeiltastenlayout' . Die Schaltung ist darauf ausgelegt, verschiedene Geräte durch Glasscheiben und Ähnliches hinweg zu steuern. Ein möglicher Anwendungsfall, welcher Anlass für den Entwurf der Schaltung war, ist die Steuerung eines 'Snake-Spiels' in einer Vitrine.

This is a follow-up of the AirControl which was published in Elektor (ID: 090329-1) in 2010. This enhanced version features a SD card socket, a high-precision pressure sensor, a dot matrix display and an optional GPS receiver, which should make a perfect hiking/walking companion... You are interested in electronics and hacking, hiking and walking, take a look and join the group...

If your USB device ever suffers from noise caused by an earth loop or if you want to protect your PC against external voltages then you need a USB isolator.

This stand-alone data logger displays pressure, temperature and humidity readings generated by I²C-bus sensors on an LCD panel, and can run for six to eight weeks on three AA batteries. The stored readings can be read out over USB and plotted on a PC using gnuplot.

Deleted Project!!No interest & other's are saying that they have a better way, so I will see what projects that they can design and offer to Elektor.