LED dot matrix how to use it, what is the principle?
Just put 64 LED in 8 rows and 8 columns. One LED has two feet. This one should know. Then, put one foot of each line together. (either the anode, or the negative pole, should be unified), and then draw a line out of the line as a drive line, there are 8 such lines. Then, each of the columns is not connected to the foot, followed by columns, but also lead a line out. Column scan line. The 8 lines connect to one of the 8 pins on a chip,
Each output line, each line of 8 lights, add output 00000001, only one light, and then switch to the second line, showing the status of the second line, assuming the output of 00000010, second lights;...... In this way, the 8 lines are circulating. Because of the visual residue, in the bright second line, people think the first line of lights and images.
Here the 8X8 dot matrix is used to illustrate. 8X8 needs a total of 64 dot matrix of light emitting diodes, light emitting diodes and each intersection is placed in rows and column lines, when corresponding to a column of the 1 level, a row of 0 level, the corresponding diode lights; to display graphics or fonts, only need to consider the display mode. The brightness of each display point can be effectively controlled by programming to control each display point corresponding to the level of LED anode and negative pole.
