The system completes the communication between the personal computer and the CC2430 by the serial port. The serial port is not the RS232 serial port but a port from A type to the USB port. The phenomenon of the experiment is displayed with the help of the serial debugging assistant. The operator can send the data and receive it from the personal computer to the CC2430 on the computer. On the other side, the CC2430 is able to receive the data from the host computer and send it to the host computer. This realizes the operator controls the CC2430 by the personal computer. It consists the hardware part and the software part.

One of the most widely-studied sub-problems of opinion mining is sentiment classification, which includes three study levels: word, sentence and document. At the third level, most of the existing methods ignore comparative sentences which have particular sentence patterns and may lower the precision of the document-level analysis. This paper studies sentiment analysis of comparative sentences. The aim is to determine whether opinions expressed in a comparative sentence are positive or negative. Experiments of comparing with document-level sentiment analysis based on simple sentences shows the effectiveness of the proposed method.