Changeset 286 in t29-www for en-v6/miscellaneous.php
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- Aug 15, 2012, 3:41:34 PM (12 years ago)
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en-v6/miscellaneous.php
r262 r286 29 29 alt="Picture of the Pianola" width="700" height="618" class="nomargin-bottom" /> 30 30 </div> 31 <h3 id="Q1"> technikum29 supports school projects:</h3>32 31 33 <p>Microcontrollers revolutionize34 and influence next to everything. How can schools participate on these35 developments and perform successful and interesting projects?<br>36 Six pupils of Q1 (12th year in school) of the Albert-Einstein secondary37 school were looking for a suitable idea for their so called "project38 week". This project should be connected to mathematics, physics and/or39 computer science. This is where the technikum29 got involved. The idea40 the pupils came up with was to connect technology from the 1950s with41 modern equipment of 2012. Communication spanning time and technology.<br>42 <div class="box left">43 <img src="/shared/photos/kommunikationstechnik/arduino1.jpg" width="606" height="335" />44 </div>45 <p>Traditionally such projects required knowledge only accessible to46 computer scientists, engineers and the like. Often they had to spend47 weeks of reading data sheets, writing cryptic assembly code etc. How48 things have changed! Since 2009 a cheap and versatile module named49 "Arduino" is available - a controller based on the well known ATmega50 328 chip featuring 32 kB of memory. Arduino boards are designed not51 for the expert but for the layman and are the perfect base for52 creative people, artists, designers etc.53 <br>54 This project focuses on connecting computers to the "real world". The55 small Arduino board can be programmed to be used as an interface for56 nearly everything. The pupils decided to connect an early fax machine57 (a Siemens KF108 made in 1958) to a modern PC. <br>58 This fax machine is based on a rotating drum which holds the sheet of59 paper to be transmitted to the receiving station. The picture is60 scanned in a spiral movement by a photodetector that slowly moves in61 parallel to the axis of the drum. Of course, this is incompatible with62 more recent fax machines.63 64 The Arduino was planned to act as the interface between this historic65 device and a modern PC. Thus the pupils first had to learn how to66 program such a micro controller which turned out to be quite difficult67 for non-programmers. Nevertheless the software approach has its68 advantages: It is more easily debugged compared with a traditional69 hardware based interface. Thus it only took a single week to program70 and interface the Arduino board to the Siemens fax.71 72 <div class="box left">73 <img src="/shared/photos/kommunikationstechnik/arduino2.jpg" width="606" height="354" />74 </div>75 76 <p>The fax machine generates an auido signal with a frequency of 1.5 kHz77 denoting black pixels to be transmitted. To convert this into a binary78 signal with a 5V level an amplifier circuit is needed that is followed79 by an RC-combination. In addition to that a synchronization signal is80 necessary to signal the start of a new line being scanned. This is81 generated utilizing a reed-contact that is triggered by a so called82 "super magnet" that has been glued onto the axis of the scanner drum.83 The reed-contact thus generates a signal for every revolution of the84 drum which corresponds to a single line being scanned.<br>85 86 The control program for the Arduino was developed by the pupils (the87 source code can be found <a href="/de/lernprojekte/arduino-projekt-programme/"> >>HERE</a>). It allows the picture being scanned, a historic Mickey-Mouse drawing, to be transferred to the PC88 where it is displayed slowly line by line with good resolution.89 90 The experiment was a full success and will inspire future projects.91 92 <p class="small">*) Arduino: The name of this board derives from King "Arduino of93 Ivrea" who lived in medieval times in northern Italy where the94 controller was developed.</small> <br>95 96 97 32 <h3 id="leander">Art in the Museum</h3> 98 33
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