A writing system that includes a reusable notebook including a sheet having a working surface. The working surface includes a printed code including an operative control. The writing system includes a writing instrument configured to capture images of the printed code and a computing device configured to communicate with the reusable notebook and/or the writing instrument. The sheet includes a porous surface located in the working surface. A writing material of the writing instrument comprises solid particles having a particle size greater than a porosity of the porous surface.

One embodiment is an apparatus for capturing marker stroke locations, including erasures. The marker includes a transmitter of acoustic pulses and an erasure cap detector that detects when a removable erasure cap is attached to the marker. A receiver includes two or more sensors to sense the acoustic pulses, the receiver operable to determine and track marker locations. When the removable erasure cap is attached to the marker, the marker locations are erasures, and when there is no erasure cap attached, the marker locations being tracked capture strokes. Another embodiment is a method of capturing marker stroke locations, including erasures, using the marker, the removable erasure cap for erasures, and the receiver.

One embodiment is an apparatus for capturing marker stroke locations, including erasures. The marker includes a transmitter of acoustic pulses and an erasure cap detector that detects when a removable erasure cap is attached to the marker. A receiver includes two or more sensors to sense the acoustic pulses, the receiver operable to determine and track marker locations. When the removable erasure cap is attached to the marker, the marker locations are erasures, and when there is no erasure cap attached, the marker locations being tracked capture strokes. Another embodiment is a method of capturing marker stroke locations, including erasures, using the marker, the removable erasure cap for erasures, and the receiver.

A writing instrument having a plurality of retraction mechanisms, wherein each of the plurality of retraction mechanisms is configured to actuate a respective retractable writing tip, each retraction mechanism being configured to produce a different predetermined sound that is suitable for being detected by an electronic device, and each of the different predetermined sounds is configured to communicate a different command to the electronic device.

A writing instrument having a plurality of retraction mechanisms, wherein each of the plurality of retraction mechanisms is configured to actuate a respective retractable writing tip, each retraction mechanism being configured to produce a different predetermined sound that is suitable for being detected by an electronic device, and each of the different predetermined sounds is configured to communicate a different command to the electronic device.

Systems and methods are disclosed directed toward the inscription of handwritten notes. The embodiments of the present disclosure enable autonomous or semi-autonomous drafting of words, symbols, letters, or signs on sheets of paper or other material using a pen plotter mechanically coupled with a writing instrument.

Systems and methods are disclosed directed toward the inscription of handwritten notes. The embodiments of the present disclosure enable autonomous or semi-autonomous drafting of words, symbols, letters, or signs on sheets of paper or other material using a pen plotter mechanically coupled with a writing instrument.

Aspects of the present invention relate to external user interfaces used in connection with head worn computers (HWC).

Aspects of the present invention relate to external user interfaces used in connection with head worn computers (HWC).

Disclosed is a digital pen that tracks the user's writing and provides useful feedback based on the user's writing. In one embodiment, the pen may provide feedback when the user has written a misspelled word, invalid mathematical expression, or any noncompliant expression. The pen may also provide feedback relating to the user's handwriting. The feedback may be visual, auditory, or tactile, and may be realtime or delayed. Statistics relating to the user's performance may be tracked, uploaded to external devices, and shared with others. This allows the user and interested parties to track the user's progress over time. The disclosed pen will be useful in educational settings.