Generate PCB files using Altium Designer software
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To generate PCB files using Altium Designer software, click Design → "update PCB Document". This process is relatively complicated and is mainly completed in the following 8 steps.
1. Click the magnifying glass button on the left side of the menu bar. The generated PCB file will appear in the minimum system 1. PcbDoc, select the entire circuit diagram, drag it to the appropriate area of the grid, and click the delete key to delete the floating layer;
2. Place components. Note that the crystal oscillator should be as close to the microcontroller as possible. If you did not select edit menu → Set Reference → Pin1 when drawing the component library of the pull-up resistor, the pull-up resistor will disappear;
3. Customize the board size. Under the Keep Outlayer layer, click the menu Place→Line and draw a suitable board outline, usually a rectangle with chamfered corners;
4. Add 4 vias. Click Place→via and set the size to 3.5mm. This is designed for fixing the circuit board.
5. Modify component annotations uniformly. Here is a very useful experience for you. The steps are as follows:
First, select a text with the left mouse button, point to it with the right mouse button → select Find Similar Objects, change Text height → any to same → click OK, and modify the Text height size in the dialog box that opens. You can then find that all text sizes have changed accordingly, which is very convenient.
The minimum system after the first five steps are completed is shown in Figure 6. 1. PcbDoc file.
6. Wiring. This step is a crucial step in generating PCB files, which can be completed in 3 small steps: ① Set electrical characteristics. Click Design→Rules…, the first step is to set Electrical Clearance→set it to 12mil. The smaller the value, the higher the precision and the higher the price; the second step is to set Routing→width, right-click to add new rule→vcc→change to 20mil, and similarly change Gnd to 20mil to prevent confusion with other lines;
Step 3: Routing vias → Set the outer 50mil and inner 25mil. ② Fully automatic routing. Generally, beginners use this type of routing rules, and the steps are as follows: Auto Route→all→Route all. Fully automatic routing principle: shortest line and least vias. As long as there is no problem with the schematic diagram drawn before, the fully automatic routing will not go wrong. ③ Manual routing. This step is suitable for skilled engineers and has a certain degree of difficulty for beginners, so I will not go into details here.
Figure 6 Minimum system after the first 5 steps are completed 1. PcbDoc file
7. Write characters or Chinese characters on the circuit board. In the Top overlay layer, press the font button to write Chinese characters or characters. Select True Type for Font, and the font can also be modified. The PCB file after the first 7 steps are completed is shown in Figure 7.
Figure 7 PCB file after the first 7 steps are completed
8. Copper coating. This step is the last key step in generating PCB files. The following is an example of a two-layer board. ① On the Top layer. The steps are as follows: Select hatched (grid copper coating) → Set Track width and Grid size to the same 10mil → Select Gnd for Connect to Net → Select Pour Over All Same Net Objects → Check Remove Dead Copper. The PCB file with copper coating completed on the Top layer is shown in Figure 8. ② On the Bottom layer, the steps are the same as above, which are omitted here. The finished PCB file is shown in Figure 9.
Figure 8 PCB file after the top layer copper is applied
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