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Christian Doeller: Conceptual Sensor (view source)
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[[File:SchwammCloseup.jpg]]<br> | [[File:SchwammCloseup.jpg]]<br> | ||
''Variable Resistance'', modified chalk board | ''Variable Resistance'', modified chalk board | ||
The biggest challenge of Variable Resistance was to find materials that are flexible in terms of the current flowing though them. <br><br> | |||
We tested things by including them into the circuit of a 555 timers astable mode.<br><br> | |||
After trying out things that I carried to the classroom I had the idea to connect something to the circuit that was already there.<br> | |||
The chalk board was a good example: by connecting a humid rag (to pin 6) and a piece of wet aluminium foil sticking to the board (to pin 7) I could draw sounds by wiping the surface.<br> | |||
Thereby I found out that it is very important to „calibrate“ the used material: a very high and still hearable tone should sound when the rag is put directly onto the aluminium connector.<br> | |||
By moving the rag further away, the tone will become deeper and deeper (as the resistance rises).<br> | |||
This tone range can be adjusted by turning a potentiometer (between pin 7 and 8) and by trying out different capacitors (between pin 1 and 2).<br> | |||
WORK IN PROGRESS<br><br> | |||
[[File:GridSketch.jpg]]<br> | |||
Sketch for the frame of the maze (10 cm x 10 cm).<br> | |||
Each corridor should have a width of at least 1 cm. <br><br> | |||
[[File:GridSketch1.jpg]]<br> | |||
Final sketch for the two dimesnional structure of the maze.<br> | |||
Defining pins for connecting the „on“ / „off“ circuit.<br><br> | |||
[[File:underneath.jpg]]<br> | |||
Setting up the switch structure with wire and tape.<br> | |||
Adding a connection for the „hell“ - circuit (red).<br><br> | |||
[[File:paperwalls.jpg]]<br> | |||
Building the three dimensional wall structure of the maze.<br> | |||
The paper walls are jammed into the sliced Kappafix.<br><br> | |||
[[File:MazeSchematic.jpg]]<br> | |||
Schematic for the electronics with four 555 Timers:<br> | |||
- monostable mode (trigger) for „on“ and „off“<br> | |||
- astable mode for heart beat sound<br> | |||
- monostable mode (trigger) for „hell“ sound<br> | |||
- astable mode for „hell“ sound (using the same speaker)<br><br> | |||
[[File:MazeBoard.jpg]]<br> | |||
Circuit borad with reset switch.<br> | |||
RESULT<br><br> | |||
[[File:MazeSetup.jpg]]<br><br><br> | |||
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== Variable Resistance == | |||
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