Images

Calibrating

 

Cheap XRAM front

 

Cheap XRAM side 2

 

Cheap XRAM side

 

Component side final card in box

 

Component side final

 

Component side Old 2

 

Component side Old

 

Connector

 

Development under way 2

 

Development under way

 

Front side final

 

Hanger

 

Lid of box

 

Sensor

 

Solder side final

 

Solder side Old

 

Thermometer in place 2

 

Thermometer in place


 

Elaboration:
A big difference in the computer function from the user's point of view is that you cannot normally load your own software, but the existing software is more hidden. The fact that you cannot load your own software makes the system significantly less complicated and more reliable than a personal computer normally is. Another important factor for both reliability and responsiveness compared to a typical personal computer, is that no complicated start-up procedure is normally needed; the actual system program, i.e. the application, is in most cases statically located in a ROM or flash memory. The application itself can therefore start within a few milliseconds after power on or reset from the watchdog. The programs are often relatively small, typically in the range of one kB to one MB. Embedded systems, or embedded systems, refer to computers or computer-like systems incorporated into devices that have one or a few special functions, often with some form of real-time requirements. The software in an embedded system is usually stored in ROM or flash memory. Embedded systems are often part of an appliance or machine including hardware and mechanical parts. Examples of devices with built-in systems are home electronics, mobile phones, industrial robots and also (more modern) white goods, cars, airplanes and modern trains. Some embedded systems are built around similar hardware as personal computers and can therefore use versions of operating systems developed for them such as Windows (see picture) or Linux, whereby several hundred MB of program memory may be required. Often such systems are nevertheless optimized for built-in use, for example Windows CE or some customized Linux distribution where programs are stored in ROM or Flash instead of on the hard drive and other optimizations have also been made. In some cases, however, long start-up times are accepted in the same way as with a personal computer (see picture). There are also intermediate things between computers and embedded systems in the sense that the user can supplement or replace software to a limited extent, an example being mobile phones. Many, but far from all, embedded systems can be said to be real-time systems.