As previously explained iButton - electronic key is widely used for electronic identification purposes in home as well as in professional high security systems. In this article we will give you entire project written in AVR C compiler Codevision that reads iButton code, checks CRC and writes it to serial port.
This article will give basic overview of iButton functionality and usage. Example of iButton usage with complete source code can be read in article iButton AVR readout example project used with DS1990R-F5. The iButton is a computer chip enclosed in a 16mm thick stainless steel can. Because of this unique and durable container, up-to-date information can travel with a person or object anywhere they go. The steel iButton can be mounted virtually anywhere because it is rugged enough to withstand harsh environments, indoors or outdoors. It is small and portable enough to attach to a key fob, ring, watch, or other personal items, and be used daily for applications such as access control to buildings and computers, asset management, and various data logging tasks.
We are witnessing the growing influence of the Android operating system. The intensity of the growth of mobile devices with the Android OS is growing exponentially. Android has a large community of developers writing applications ("apps") that extend the functionality of the devices. Developers write primarily in a customized version of Java. Apps can be downloaded from third-party sites or through online stores such as Android Market, the app store run by Google. As of October 2011 there were more than 400,000 apps available for Android, and the estimated number of applications downloaded from the Android Market as of December 2011 exceeded 10 billion. So, in that amount of applications, engineers can find many useful things that can help us at any time. Since our fields of interest include microcontrollers and electronics in general, we recommend the following applications.
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