| 摘要 |
A wireless keyboard capable of implementing handwriting function is provided. The wireless keyboard comprises a control circuit. The control circuit comprising a switching matrix circuit; a micro-controller connected to the switching matrix circuit, the micro-controller being used to transform data transmitted from the switching matrix circuit into RS-232 codes; two ultrasonic wave receivers for receiving signals transmitted from a ultrasonic wave generator installed in a pen, and then calculating the coordinate of the pen according to time difference; a microprocessor connected to the two ultrasonic wave receivers, the microprocessor being used to transform the data processed by the ultrasonic wave receivers into UART format; and a bluetooth module connected to the micro-controller and the microprocessor, the bluetooth module being used to transmit the UART format data from the micro-controller or the microprocessor to a computer supported by bluetooth system.
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