Changes

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* brightness: average luminance seen through camera
 
* brightness: average luminance seen through camera
 
* camera: grab image from camera
 
* camera: grab image from camera
 +
* button down: current state of the mouse button (1 == down; 0 == ip)
 +
* mouse x: x position of mouse
 +
* mouse y: y position of mouse
    
The OLPC XO can measure external inputs with its microphone jack:
 
The OLPC XO can measure external inputs with its microphone jack: