We use 74LS138 and 74lS160 drive 8*8LeD dot matrix display, the circuit diagram should be what kind of ah, solve ah!
On the network many diagrams, this is the expansion of the mouth of the IC, because the microcontroller IO port is limited and the current is small, can not be directly driven, you need to expand and drive
1617 connect 74LS138 B1 Y1 to LCD E port of A1
74LS160 is two (ten) binary counter, 74LS138 is 38 line drive, with multiple 74LS138 parallel output, the front of the 74LS160 ABCD output end of a 8421 yards - three wire converter, and then 74LS138
