Abstract:

In order to monitor the students’ measuring progress synchronously and provide effective guidance in teaching laboratories, we design a testing system to receive and send experimental data wirelessly, which consists of the single chip microcomputer, AVR ATmega 16, and the integrated wireless RF module, RF4432. Aiming at the two procedures and under the FIFOs pattern provided by wireless module, we develop a set of wireless communication protocols which can meet the needs of intercommunications among the master and slave machines. And timedivision communication is adopted to prevent data collision. We elaborate the establishment of the wireless communication circuit, the protocol and timing sequence of the system’s master and slave machines in detail, as well as the design of a visualized interface. Finally, the testing system is applied in Millikan oildrop experiment, and the results show that it not only runs stably and efficiently but also fulfills the requirements of monitoring students' experimental progress. In conclusion, it can enhance the experiment teaching efficiency significantly.

Key words: laboratory;wireless communication;single chip microcomputer;RF4432 module;visualized controlling interface