NXTW

stuffs
mathani:

Get you best paper, cut a circle and fold it, fold it so that the circumference falls on a fixed point inside. Repeat, using random folds. Now see the creases. This is how you paper-fold an ellipse.

mathani:

Get you best paper, cut a circle and fold it, fold it so that the circumference falls on a fixed point inside. Repeat, using random folds. Now see the creases. This is how you paper-fold an ellipse.

(via visualizingmath)

Raspberry Pi with I2C-Arduino-Slave

binerry:

image

Since Raspberry Pi has only about 8 GPIO’s (or up to 17 if you reconfigure UART, SPI and I2C as GPIO) or for some other reasons, it may be helpful to combine Raspberry Pi with another μC or PIC (or even a ready-to-use μC-/PIC-Board like Arduino, Netduino or Pinguino) e.g. to get more I/O’s or just to seperate two different application areas. Such a combination is surely easy to setup via serial or usb - but at least if serial/usb is already in use or if you are thinking about using more than one further μC or PIC its getting a bit clumsy. Much more flexible and cleaner will be a solution via I2C - in this case you can easily address up to 128 slaves.

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talyellin:

Exploring the first 100 digits of PI.
3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067

talyellin:

Exploring the first 100 digits of PI.

3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067

(via visualizingmath)

Anonymous asked: which is the most perfect geometrical figure?

visualizingmath:

I’m not sure, Anonymous! I’m just going to say it’s the circle.

Anywho, while trying to form an opinion on the answer to your question, I looked up “circle” on Wikipedia and found this picture:

image

"Area enclosed by a circle = π × area of the shaded square." I know it’s not very impressive, but I’ve just never thought of it like that! Thanks, Anon.