Ways of getting numbers

* Getting a range of numbers read by the difference in resistance.

* Suggestions by Andreas are:

- Graphite;

- Motor;

- LDR;

- Potentiometer.

* Building a prototype of a kaleidoscope.

* Measuring the end (parts to cut, the PVC pipe has rough edges).

* Cutting the end.

* Building a box to contain the electronics and cables out of a foam board.

* Building the container.

* Base and wall.

* A prototype.

* Applying the graphite.

* Attach to a cable (that will later be connected to the arduino board).

* Placed at the top of the box.

* Blackened.

* Electronics:

- 10kΩ resistor;

- Arduino board.

* Graphite-based prototype.