The following schematic, row1 ~ row4 for the out signal, line1 ~ line4 for line signals, signal acquisition button, the first full-line home signal to 0, and then read out the signal, signal out to determine whether there are 0 signal, if signal 0 , then press the indicated button, and then in accordance with the state of rows and columns to determine which button is depressed, and 16-band light-emitting diodes to form instructions.

4×4键盘识别技术.doc

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