How does the SMART Board interactive whiteboard know which SMART Pen Tray tool Im using?
Optical sensors in the pen tray automatically detect when a tool is lifted and send this information to the computer. If you pick up the red pen, your next contact with the surface will be in red ink. If you pick up the eraser, you’ll erase the ink. LED lights indicate which tool is active. If more than one tool is removed from the tray, the last tool selected will be active.
