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Interfacing an AVR Controller to a GPS Mobile Phone
Posted on Tuesday, April 8, 2008   •   Category: AVR

My goal is to build a kind of a mobile tracker. There are many different use cases you can think of but one of the obvious is a device, that is able to report where it is. This device can be put in your car and it could trigger an alarm, if the car got stolen. Actually it could tell you where it is. There are already mobile tracking devices out there, but they seemed to be too expensive and too closed for my needs. Another option is one of these new Nokia N95 which have built-in GPS. They are really nice, but about 600€, which is not a bargain. So I decided to do my own.

50MHz Frequency Counter
Posted on Tuesday, April 8, 2008   •   Category: Test and Measurement

This is 50MHz Frequency counter based on AVR.It is designed by Ulrich Radig from German.He writes:The construction of a small Frequenzzähers thanks to the current Atmel AVR controllers or even the microchip PIC controller (to name but two) relatively quickly and easily. These are mostly internal timer / counter of the controller is used. The counter is supported by the adjacent signal at high input clock counted. The timer will be the counter to a specified time ever out and reset. Let’s take a look at a 20Hz TTL signal taktet to counter it is now in the counter register for a second of value 20 This is exclusively on the display or serial interface. After a successful auction at a relevant Internet auction house, I bought some 7Segment ads, I had to think of something. The result was therefore a little cheaper said 50MHz frequency counter, which I will not be denied.

PCM2706 High Fidelity USB Soundcard / USB Headphones
Posted on Monday, April 7, 2008   •   Category: USB Soundcards / USB Headphones

This is a high fidelity external USB Soundcard / USB Headphones project that can be built for your PC or Mac. It is based on the latest PCM2706 IC which functions as a high quality, crystal clear 16-BIT Stereo DAC. It is a single chip digital-to-analog converter that offers two D/A output stereo channels, digital S/PDIF output and requires very few external components. PCM2706 includes integrated USB 1.0 & USB 2.0 compliant interface controller and it is conveniently powered directly from USB connection. PCM2706 is a USB plug-and-play device and does not require any driver installation under Windows XP and Mac OSX. PCM2706 chip also provides seven functions that are controlled with tactile switches. It provides volume (up / down), Play, Stop, Previous Track & Next Track controls. These functions do not need any software or driver installation and work instantly after connecting PCM2706 to a computer's USB connector.

PIC Dual Temperature Meter
Posted on Sunday, April 6, 2008   •   Category: Test and Measurement

This is a simple to build PIC Temperature meter that allows to measure temperature in two different locations at the same time. Meter can display both Celsius and Fahrenheit values (together or individually) and is capable of measuring temperatures from -55 to 125 degrees Celsius (-67 to 257 degrees Fahrenheit). Never before such a useful and powerful circuit could be built with so little components and yet provide endless possibilities. This is all possible thanks to the use of PIC16F628 microcontroller and 2x16 character LCD display that act like a small computer which can be customizable thanks to upgradeable hex firmware. Presented PIC temperature meter uses two very exciting DS18S20 1-Wire digital temperature sensors. Unlike regular sensors where temperature readings are passed as varying voltage, DS18S20 passes temperature information in a digital format as data. This brings many new possibilities and enables to pass temperature information over much longer distances just over a two wire cable.

Dual Channel 70V PIC Voltmeter
Posted on Sunday, April 6, 2008   •   Category: Test and Measurement

PIC voltmeter can measure 0-70 Volts which should be more than enough for most of electronic projects providing excellent reading accuracy and resolution. It has two input channels for measuring two voltage sources at the same time. This PIC voltmeter project uses PIC16F876 microcontroller with built-in ADC (Analog to Digital Converter) and 2x16 backlighted LCD display.

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