GMU:Sensor Hacklab/Christian Doeller: Difference between revisions

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 [https://vimeo.com/170147174 ===> VIDEO]
+__________________________________________________________
+Finishing the prototype:<br><br>
+The plan was to implement more switches into the carpet-matrix in order to allow playing with more output possibilities.<br><br>
+I achieved that by changing the design:<br><br>
+) Layout<br>
+) Switch Design<br>
+) Programming<br><br>
+) <br>
+I designed a bigger and more complex layout of „switch holes“ inside the „distance grid“.<br>
+The switch holes are VERTEILT all over the mat.<br>
+I kept all the cut out pieces in order to change the design as I need it by putting them back in place.<br><br>
+„Raster_Styro.jpg“
+) <br>
+I changed the switch design: they now consist of two carpet-size cardboard pieces that are supplied with „circuit lanes“ made of aluminium foil. <br>
+There are two cardboard pieces: one is equipped with the bottom part of each switch, the other one is equipped with the upper part. <br>
+The bottom part features eight and the upper part features six „circuit lanes“ that are located in a way so that they form a kind of matrix-grid when they are put on top of each other. <br>
+Raster_Karton.jpg <br><br>
+Zeichnung_Karton.jpg
+Zeichnung_Karton2.jpg
+Zeichnung_Karton3.jpg
+Alu_Karton.jpg
+Raster_Alu_Karton.jpg
+Alu_Karton2.jpg
+I first planned to use a resistor ladder for the Analog input pin of the arduino in order to minimize the amount of pins being used.<br><br>
+Schematic_Raster_Styro.jpg
+Alu_Resistor_Ladder.jpg
+Alu_Resistor_Ladder2.jpg
+As this did not work out (too many delays in the code, too slow, a lot of noise) I changed the design by attaching a separate wire to each of the eight „circuit lanes“ that go to the Arduinos digital input.<br>
+Now there are 6 + 8 = 14 wires coming out of the carpet. 6 of them are used as „digital out HIGH signals“ and the other 8 are used as „digital in, normally LOW“ pins that check if a button is pressed.<br>
+Arduino_Raster_Karton.jpg
+)<br>
+The resistor ladder idea did not really work.<br>
+Therefore I decided to get a bit more into working with the Arduino Keypad library.<br>
+The library is made for a 4x3 keypad matrix.<br>
+This layout can easily be changed by adding more COLS and ROWS to the array.<br><br>
+You can find more information about the library here:<br><br>
+http://playground.arduino.cc/Code/Keypad
+http://www.dummies.com/how-to/content/how-to-specify-userdefined-functions-for-your-keyp.html
+Arduino_Raster_Matrix_Carpet.png
+External pullup or pulldown resistors do not need to be added.<br>
+The code uses the built in IMPUT_PULLUP command. <br>
+It is also configured to have a multi button press function for which you normally have to add diodes to each input in order to prevent short circuits.<br>
+I don’t exactly know why but the comments tell that these external diodes do not have to be added when using the keypad library.<br>