(this article is a work in progress). My own advice will be added later...
Having a system that regularly writes parameters to the EEPROM can wear out the EEPROM, since it is only guaranteed to endure 100 k erase/write cycles. Writing the parameters to a circular buffer in EEPROM where each of the elements in the buffer can endure 100 k erase/write cycles can circumvent this. However, if the system is exposed to RESET conditions, such as power failures, the system needs to be able to identify the correct position in the circular buffer again. This document describes how to make safe high endurance parameter storage in EEPROM/
Read more: http://www.atmel.com/images/doc2526.pdf
If you upgrade to windows 8.1 64-bit, you may find that you cannot install argyll drivers for your colorimeter in a usual way.
To install them, you need:
Keywords: Apache MPM ITK PHP MySQL VPS CentOS
In this article I'm going to describe a typical configuration for a private web server. I assume you use CentOS 6 as your operating system, in other *nix distributions some paths and commands may vary. However, the idea remains intact:)
Most servers require PHP as scripting language, and MySQL for databases
If you run multiple websites, it is always better to run them as different users. Even if a hacker gets access to one of your sites, there's a high chance that the others will remain intact.
We all are familiar with iButton devices - a small chip used as a key almost everywhere:Those keys use Maxim's (formerly Dallas Semiconductor) 1-Wire protocol. It's a nice thing and it is used in many other devices, like temperature sensors (DS18B20, DS18S20 for instance).
As it comes from the name, 1-Wire devices require only one wire for data transfer. Some devices are also capable of using ithis line as a power source. (However, one will still need another wire - for ground).You can attach a large number of devices to the same line. That's especially well when you are using Arduino - OneWire line takes only one digital pin, and you theoretically can plug all you OneWire sensors, keys etc to this line.