Digital tube and single chip microcomputer

No matter how the pins of 1. digital tube are arranged, they are all connected to P0.0~P0.7 according to abcdefg (assuming P0 port is used). Therefore, when you draw the schematic diagram, you must find out which pins are abcdefg of the digital tube.

2, you don't know the digital tube pin arrangement order in your hand, it's very simple. You use a multimeter to click on the above picture, first find a sorting chart, and then click the pin of the male * * * terminal and another non-male * * * terminal according to the picture (note here that the male and female digital tubes of * * * * are in different directions. * * * When the sun is shining, put the red pen on the public side and the black pen on the public side.

According to this method, if the corresponding line segment is lit, it means that the sorting is the same as the corresponding graph. If it doesn't light up, find another sorting chart and measure it again as above until it is correct.

Generally, you can try twice at most. Because the commonly used digital tube is Figure (B). It can be measured in the order of Figure B first.