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An electronic module that inserts into or is otherwise associated with a pen or other writing instrument. The electronic module includes a mechanism, such as an accelerometer, for detecting pen motion. The electronic module is preferably mounted in a substitute ink cartridge for a pen. Ballistic inf

An electronic module that inserts into or is otherwise associated with a pen or other writing instrument. The electronic module includes a mechanism, such as an accelerometer, for detecting pen motion. The electronic module is preferably mounted in a substitute ink cartridge for a pen. Ballistic information generated by the accelerometer is transmitted via the radio transmitter to a computer (e.g., a personal computer), where processing and/or storage of the accelerometer information may occur. The accelerometer information may be used, for example, for handwriting recognition or digital ink generation. The electronic module is preferably provided in a casing that is shaped like an ink cartridge. Contemporary pens usually include two cartridges within the pen, a first that supplies ink to the nib, and a second that presses the first against the nib. The components may be mounted in a cartridge that is placed in the position of the second cartridge.

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1. A device for sensing writing movement, comprising,an electronic module configured to be received within a cavity of a writing instrument, comprising: a ballistic generator that is configured to generate movement information resulting from writing movements; and a transmitter that is configured to

1. A device for sensing writing movement, comprising,an electronic module configured to be received within a cavity of a writing instrument, comprising: a ballistic generator that is configured to generate movement information resulting from writing movements; and a transmitter that is configured to transmit the movement information to a remote computer; and wherein the cavity is configured to receive a plurality of ink cartridges and the electronic module is configured to be inserted in place of one of the cartridges. 2. The device of claim 1, wherein the ballistic generator comprises an accelerometer.3. The device of claim 2, wherein the accelerometer is configured to generate writing instrument tilt information.4. The device of claim 1, further comprising a motion sensor configured to power on the electronic module upon detecting movement of the electronic module.5. The device of claim 1, wherein a first of the two cartridges is aligned to provide ink for a tip of the pen, and a second is positioned so that it abuts the first, and wherein the electronic module is configured to be positioned in the location of the second cartridge.6. A writing instrument, comprising:an electronic module configured to be mounted within the writing instrument, comprising a ballistic generator that is configured to generate movement information resulting from writing movements of the writing instrument, and wherein the writing instrument is a pen that is configured to receive a plurality of ink cartridges, and the electronic module is configured to be inserted in place of one of the cartridges. 7. The writing instrument of claim 6, wherein a first of the two cartridges is aligned to provide ink for a tip of the pen, and a second is positioned so that it abuts the first, and wherein the electronic module is positioned in the location of the second cartridge8. The writing instrument of claim 6, wherein the ballistic generator comprises an accelerometer.9. The writing instrument of claim 8, wherein the accelerometer is configured to generate writing instrument tilt information.10. The writing instrument of claim 6, wherein the electronic module further comprises a motion sensor configured to power on the electronic module upon detecting movement of the writing instrument.