Keyboard with 4* 5 matrix keyboard, with two key combination. 2. Hardware connection is a bit confusing, and the arrangement of the various buttons and paste the key code corresponding to face chaos. If the use of conventional textbooks matrix keyboard scanning more complicated to achieve. 3. need to identify the two double bonds, but the two double bonds are special positions K17, K18 and K19, K20. 4. Based on 2,3 points. here with columns, rows are all zero output , read the rows, columns of pin-level information. comprehensive information look-up table for the two sets of keys. For Speed Press, there are two bits to 0. For the two buttons pressed, 3 or 4 bit to 0.

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