From techradar: History of Modems
Dec 27th
There’s an interesting article over at techradar.com showing the development of modem technology, from the 1950’s onwards. Re-live those dialup days!
Merry Christmas!
Dec 25th
Hope everyone has had a good Christmas. What gadgets were you all lucky enough to receive this year?
Handy Link: The Ultimate Online Calculator
Dec 17th
Need a calculator for every occasion? This handy online calculator site has everything a science or Electronics nerd could possible need. Hope it’s useful.
Handy Link: Using the AVR EEPROM in GCC-AVR
Dec 11th
EEPROM memory can be extremely useful in Microcontroller projects, either as a fail-safe mechanism (to stores the state of your outputs so you can restore them if power is lost) or as a non-volatile storage area for data gathered via sensors.
This tutorial from AVR Freaks explains how to read from and write to EEPROM memory using AVR-GCC. Hope its useful to someone.
From alan-parekh.com: Single Button Code Entry System
Dec 9th
Forget keypads and RFID tags, the guys over at alan-parekh.com have come up with the simplest possible user interface for a code entry system: a single button. Sold in kit form via their online store and incorperating a PIC 16F628A microcontroler and relay, this kit allows you to program and input a four-digit code using only one button.
Details and a video explaining how the kit works can be found here.
Handy Link from scienceprog: MAX232 Alternatives
Dec 8th
The MAX232 Intergrated Circuit is invaluable to anyone wanting to interface their 5v UART projects (or other embedded devices, such as the Linksys WRT54G) with a PC. But what if you want a simple (and, more importantly, cheaper) alternative. This article from Scienceprog.com should scratch your itch.
Simple LAN Controlled Stereo Audio Switch
Dec 7th
I needed an idea that I could use to teach myself about using a relay with Microcontrollers and solve that age old problem: Switching between speakers and headphones on my PC without having to actually get up and mess around in the rats nest of wire’s behind it.
The solution: Use a 5v DPDT relay, a few 3.5mm stereo sockets and an Ethernet-capable Arduino to create a simple audio switch which would allow me to switch one audio source (my PC’s Soundcard in this case) to one of two outputs (headphones or speakers) via a web interface running on the Arduino from the comfort of my web browser.
Handy Link: AVR Timer Calculator
Nov 30th
Ok, here’s another little gem I came across on the web that I think you’ll find useful: A web-based Timer calculator, courtesy of Frank at circleofcurrent.com
Just put in your clock frequency and the time (in seconds) you need to count to and let the calculator do the rest.
8 bit and 16 bit timer resolution values are catered for and he even includes a prescaler function so you can experiement with different prescaler values.
Note, You’ll need to make sure that you have Javascript enabled in your browser to use it.
AVR C Bit Level Operations Guide
Nov 28th
Found this very comprehensive guide (Link is a PDF document), during my travels on Google, showing how to perform bit-level operations in AVR C. Hope it’s useful to someone.
If you’ve not got a PDF reader to hand, then you can use Google’s Quick View link to this guide to view it in your browser
Apache on an LG Cookie
Nov 19th
[smartads]
After recently buying an LG KP500 ( The “Cookie”) and spending a day playing round with it (as you do), I discovered that the phone had an installation of the Apache Webserver, of all things, on it!
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