Competition answer Machine in this paper use 8×10 keys and their X,Y data to confirm the respondents’ location which express as different X-coordinate and Y-coordinate. When the respondent sends out signal, first confirm its Y-coordinate, then scan and make notes. The signal which is pitched on ranks high-level inverter, and others low-level inverter. After coding by encoder, the signal finally shows the Y data in LED. Subsequently, confirm the X-coordinate and dispose it, using the same method as Y-coordinate. And then, it can ensure the respondents’ location according to the (X,Y) which just got, spring the sound controller through RS trigger lastly.
