Recently, I needed to do a small experiment with dot matrix, and I went to buy a few pieces. At that time, the store asked me, "Do you want to share the yang or the common yin?" At that time, I was guilty. Is this also a common yin and a common yang? The conversion of 90 degrees of Gongyang is not the same as that of the common yin. The 90 degree of the common yin is not the same as that of the common yang. Fortunately, I remembered the model at that time, and the thing was successfully bought back, but this question must be solved to ask the shit. Now the text and information of the search are organized as follows:
First of all, to solve the problem of common yin and yang, there are such words on the Internet.
Argument 1: In fact, monochrome dot matrix LED does not matter whether it is common or negative, so the name is mostly caused by industry habits. On the market, the so-called common yang or common yin of 8*8 dot matrix LEDs is generally defined according to the polarity of the first pin of the dot matrix. The first pin is anode for common yang, and vice versa. Common shade.
Statement 2: The seller said that the common yin or the common yang should be said to be a common yin or a common yang
From these two pictures, we see that the first foot is in the first line, so these two statements are actually the same.
Let's talk about some basic knowledge of dot matrix.
Pin definition:
Some dot matrixes are marked with the first leg, but some are not marked. Now everyone defaults to the same order as the IC pin. The reading is that the first leg is generally on the side with the word on the side, and the word is the first on the left side. The foot is 1, then sorted counterclockwise to 16 feet, as shown:
Row definition
8*8 dot matrix internal structure
Common yin
Common yang
The above figure also marks the corresponding pin number of each row and column of ark sz410788k dot matrix. I am not sure whether all the 8*8 dot matrix pins correspond to the same row and row as the ark dot matrix. But the order of the two or three types of dot matrix I have used so far is the same as the above two icons!
If you do not know the pin order, you can use a pointer multimeter to detect
The specific steps for measuring the pins are as follows (you can use a multimeter or other voltage source to test, I am using a mechanical multimeter)
1. [Fix the positive and negative poles] Turn the multimeter to the resistance file ×10, first select a pin with the black probe (output high level), the red probe touches the remaining pins, and the dot matrix has no light. If there is no light, use a black probe to select another pin. The red probe touches the remaining pins. When the dot matrix emits light, the pin that the black probe touches is the positive electrode, and the red probe touches the light. The pins are negative and the remaining 6 pins are positive.
2. [Pin No.] First record the positive and negative distribution of the pin of the device. The positive (row) is represented by a number, the negative (column) is represented by a letter, the negative pin number is determined first, and the black probe selects a positive electrode. Pin, red dot negative pin, see the diodes in the first few columns, the first column writes A on the pin, the second column writes B on the pin, the third column... and so on. . This way half of the pins are numbered. The remaining positive pins use the same method. The first line is highlighted on pin 1, the second line is on pin 2, the third line, and so on.
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