Parallax has introduced their Optical Finger Navigation (OFN) sensor module. This HID is designed to sense the presence of a finger and track its movement much like a mouse. Interfacing is via I2C, supply voltage between 3.3 and 5.5 volts, and convenient 0.1? pin spacing for breadboarding. The datasheet explains the theory of operation as using an onboard Image Acquisition System that obtains microscopic images of the finger surface, and those images are processed by a Digital Signal Processor. [via]
Parallax Optical Finger Navigation module – [Link]
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