Simple method of single chip microcomputer processing password

rain

Simple method of single chip microcomputer processing password [Copy link]

The following are some of my views on keyboard password input and processing using a single-chip microcomputer. The keyboard is a 4*4=16 -key small keyboard connected to port P2 , with four rows and four columns connected to P2 respectively.

The high and low bits of the port. The P1 port is connected to 8 LEDs to save the input password. The main idea is " first in, first out " .

Alex112

Thanks! Will check it out first!