When working with more complex Ardiuno projects you may find that there isn't enough SRAM - the memory used for storing and manipulating variables when a sketch is running. A typical Arduino board such as the Uno only has two kilobytes, which can run out quickly. Of course there is the internal EEPROM, however this is slower and has a finite life. Australian Nick Gammon has described a way to use additional, external SRAM ICs via the SPI bus with an Arduino to increase the temporary memory that is simple and inexpensive.
For more information an Nick's detailed tutorial, visit his site here. Andfor morenews, updates and items of interest.please follow us on twitter, Facebook and Google+. Another way to increase all three memories of an Arduino (SRAM, flash memory and EEPROM) is to upgrade your project to the Arduino Mega2560:
Not only does the Mega2560 have 54 digital and 16 analog input pins, it has eight kilobytes of SRAM, as well as 256 kilobytes of flash memory. Therefore by using a Mega2560 - you have more sketch room, more variable space, and a bucketload of I/O.
Using the popular Bluetooth Bee, Legwinskij has demonstrated a method of uploading Arduino sketches wirelessly using a Bluetooth-enabled PC. Although the process is not entirely automated at this stage, it will be a project worth monitoring - as once the process is completed it will make updating the software on embedded Arduino systems much easier. The following is a short demonstration of the current process:
For more information and the current progress, visit Legwinskij's blog here. Andfor morenews, updates and items of interest.please follow us on twitter, Facebook and Google+.
The Bluetooth Bees are a convenient method of connecting your projects with Bluetooth, and also fit in any socket designed for an XBee. Once paired with another Bluetooth device such as an Android phone or tablet, it is easy to monitor data from the serial output via terminal emulation software on the device.
Although many people try and investigate the actions of others using the Internet, cracking passwords and so on, nothing beats good old fashioned espionage and with that in mind is this FM radio transmitter. Naturally it has other applications such as a baby monitor, one-way front door intercom or just to fool about with a car radio. Using a minimum of parts and powered by a simple coin battery, this transmitter can operate on a frequency of between 80 and 150 MHz, with a range up to 100m.
It is easy to build and only requires a few components, some stripboard and soldering. To get started, see the instructions page here. Andfor morenews, updates and items of interest.please follow us on twitter, Facebook and Google+.
If you are interested in analogue electronics such as the radio bug described, a great starting point is the book "Getting Started in Electronics" by Forrest Mims III:
Over 128 pages he teaches you the basics, takes you on a tour of analog and digital components, explains how they work, and shows you how they are combines for various applications. It even includes circuit assembly tips and 100 electronic circuits and projects you can build and test. Even if you're not new to electronics, this book makes a great shop reference.