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Smart pen with spell checker

06.08.2013

Young German entrepreneurs Falk Wolsky and Daniel Kaesmacher are planning to start serial production of the Lernstift pen, capable of checking spelling and putting beautiful handwriting, in six months.

Lernstift contains an embedded computer running a Linux kernel operating system, a motion sensor, memory, a Wi-Fi adapter and a vibration motor. The motion sensor, consisting of an accelerometer, a gyroscope and a magnetometer, has a resolution of 400 dpi. It scans the text that the user writes. Every second, the sensor is able to send data to the processor 200 times.

The computer has software installed that decrypts the data received from the sensor. The program was developed by "the world leader in optical recognition technology" Vision Objects and "has been tested on millions of tablets and smartphones around the world." The authors of the project turned to many third-party companies for help. For example, the design of the handle was developed by the design office ipdd from Stuttgart.

The program needs much less data than the sensor can provide - a resolution of 100 dpi is enough to recognize handwritten text, and 50 times per second is enough to receive data. The program is executed by the processor included in the computer built into Lernstift, which is equipped with 128 MB of RAM. The recognition rate of one character is 20 ms.

Lernstift can do two things. The first function is error checking. If the user makes a mistake in a word, the pen will automatically vibrate. The second function is handwriting improvement. The pen vibrates if the handwriting becomes illegible.

The Lernstift software is able to adapt to a person's handwriting. To calibrate the pen, the user needs to write a few words in block letters and then in italics. Based on these data, the program will further study the user's handwriting.

The Lernstift pen is intended to be used by children aged 5 years and older and adults of all ages. Pen nibs can be changed. Pens are planned to be produced in blue and pink colors - for boys and girls. And an open programming interface (API) will allow third-party developers to create various applications for Lernstift.

Lernstift can be connected to a computer, smartphone or tablet and save the text that is written with it. So you can save notes, or, for example, parents can check the progress of their child. Notes can be shared on Facebook and Twitter.

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