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GMU:Sensor Hacklab/Christian Doeller (view source)
Revision as of 08:29, 1 August 2016
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[https://vimeo.com/170147174 ===> VIDEO] | [https://vimeo.com/170147174 ===> VIDEO] | ||
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Finishing the prototype:<br><br> | Finishing the prototype:<br><br> | ||
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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> | 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> | 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> | 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 <br> when they are put on top of each other. <br> | ||
[[File:Raster_Karton.jpg]] <br><br> | [[File:Raster_Karton.jpg]] <br><br> | ||
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[[File:Alu_Karton2.jpg]]<br><br> | [[File:Alu_Karton2.jpg]]<br><br> | ||
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> | I first planned to use a resistor ladder for the Analog input pin of the arduino in order to minimize <br> the amount of pins being used.<br><br> | ||
[[File:Schematic_Raster_Styro.jpg]]<br><br> | [[File:Schematic_Raster_Styro.jpg]]<br><br> | ||
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[[File:Alu_Resistor_Ladder2.jpg]]<br><br> | [[File:Alu_Resistor_Ladder2.jpg]]<br><br> | ||
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> | As this did not work out (too many delays in the code, too slow, a lot of noise) I changed the design <br>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> | Now there are 6 + 8 = 14 wires coming out of the carpet. 6 of them are used as „digital out HIGH signals“<br> and the other 8 are used as „digital in, normally LOW“ pins that check if a button is pressed.<br> | ||
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External pullup or pulldown resistors do not need to be added.<br> | External pullup or pulldown resistors do not need to be added.<br> | ||
The code uses the built in IMPUT_PULLUP command. <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> | It is also configured to have a multi button press function for which you normally have to add diodes to each input<br> 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> | I don’t exactly know why but the comments tell that these external diodes do not have to be added when using <br>the keypad library.<br> | ||