By: Dr. Ahmed ElShafeedraelshafee.net/Spring2017/practical-app-ee-iv---lecture-02.02.pdfDr. Ahmed...
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By: Dr. Ahmed ElShafee Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ١ Lecture (02) design schematic and PCBs using eagle Before start • You will be making a schematic (astable.sch) file which contains your circuit diagram & a PCB board layout (astable.brd) file. • Each file has its own editor window. At any time you will change just one of these but the two are linked, so that the connections & components on the schematic always exist on the board. • For example if you try to delete components on the board you will be asked to make the change on the schematic first. • To undo command (Edit‐>Undo or Ctrl‐Z) • to refresh the display View‐>Redraw (F2) Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٢
Transcript of By: Dr. Ahmed ElShafeedraelshafee.net/Spring2017/practical-app-ee-iv---lecture-02.02.pdfDr. Ahmed...
By:
Dr. Ahmed ElShafee
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ١
Lecture (02)design schematic and PCBs using
eagle
Before start
• You will be making a schematic (astable.sch) file which contains your circuit diagram & a PCB board layout (astable.brd) file.
• Each file has its own editor window. At any time you will change just one of these but the two are linked, so that the connections & components on the schematic always exist on the board.
• For example if you try to delete components on the board you will be asked to make the change on the schematic first.
• To undo command (Edit‐>Undo or Ctrl‐Z)
• to refresh the display View‐>Redraw (F2)
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٢
• Start the EAGLE control panel.
• Options‐>Directories gives a list of directories. Change the projects directory if necessary to something convenient that you can write, e.g.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٣
• All new projects will be created inside this directory, and the EAGLE project navigator in the control panel uses this as a root.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٤
Schematic Creation
• Start the EAGLE Control Panel application. Create a new project: File‐>New‐>Project.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٥
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Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٦
• Rename the project if you wish as follows: the control panel window indicates whether a project is open with a green circle next to the project name. Click this if necessary to close the project. Then
• Right‐click‐>Rename
• on the project's name. After having renamed the project you can reopen it.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٧
• Right‐click on the Project name ‐>New‐>Schematic. The schematic window will open. Inside the schematic window:
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٨
• File‐>Save as (choose a suitable name for your schematic sheet
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٩
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Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ١١
• Add components to your schematic:
• Edit‐>Add‐> Select component.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ١٢
• Click on add icon
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Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ١٦
• Left‐click to place each component. Right‐click before placing to rotate the component. Any number of the selected component can be added. To stop the ADD procedure select Edit‐>Stop Command.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ١٧
• Press “esc” to end add command
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ١٨
• components can also be moved after adding, with the Edit‐>Move command,
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ١٩
• or rotated with the Edit‐>Rotate command.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٢٠
• Copy , delete
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٢١
• Rest of components used in astable circuit
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٢٢
Name Library Device Package
Electrolytic cap 220uF rcl > CPOL-EU CPOL-EUE5-10.5 E5-10,5Resistors 1/4W – normal fit rcl > R-EU_ R-EU_0207/10 0207/10
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Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٢٣
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• Change value
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Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٢٧
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• move block
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Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٣٠
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• Add more components
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٣٢
Name Library Device Package
78xx Voltage regulator –Vertical
linear > 78* 7805TV TO220V
Power socket Con-jack DCJ0202 DCJ0202LED 5mm Led > LED > LED5MM LED5MM
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• Add supply
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• Connecting components using net
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• Where a wire joins the middle of another there must be a green circle (Draw‐>Junction) to indicate connection. Sometimes two nets are adjacent and appear joined but in fact are not. The View‐>Show tool () is invaluable here. If you click on any part of a net it will highlight all connected wires and component endpoints. You can then easily check what is missing. When you encounter such an error simply delete (Edit‐>Delete) line segments around the problem and rewire again (Draw‐>Net).
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٣٩
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٤٠
• Electrical Rule Check
• When you think you have connected everything you must do an ERC which will identify disconnected pins, nets which are next to each other but not connected, etc.
• Tools‐>ERC
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٤١
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• Add docfield:
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• Edit‐>Global attributes‐>New and add name=DRAWING_AUTHOR, value= <your text>. View‐>Redraw (F2) will update the displayed text as in Figure 5.
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Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٤٨
• Printing a Parts List :
• You can print a parts list for a schematic (including resistor and capacitor values) with File‐>Export‐>Partslist.
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Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٥١
Board Creation & Layout
• File‐>Switch to Board
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٥٢
• The board consists of all your components, with connections shown as a rats‐nest, and a rectangular wire outline (default 100mmX80mm) which represents the board area.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٥٣
• You can do this any time, but it is easier before you have populated the board outline. The wire rectangle defines where the board will be cut. To change the board size Edit‐>Move and left‐click near the middle of the top or right side of the rectangle to pick it up. Re‐position making sure the board stays rectangular, and left‐click again to terminate. Don’t ever reposition the bottom or left sides, which should intersect very near the “origin” cross.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٥٤
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٥٥
Position the components inside the board outline
• Move the components one by one inside the rectangular board outline (Edit‐>Move) and position them where you want. Note that you must move components into the allowed 100*80mm area and cannot rearrange them outside the allowed area
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٥٦
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Use EEE custom DRC and autoroute parameters
• In order for board manufacture to allow easy soldering we need to make pads bigger by changing the default DRC rules
• File ‐ Allows you to pick which DRC file to use.
• Layers ‐ layers can be added by changing Setup to be something like (1*2*15*16)
• Clearance ‐ This tells Eagle how much room you want between the different types of electrical contacts on the board. 20 mils is a reasonable clearance.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٥٩
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٦٠
• Distance ‐ Copper/Dimension is the distance from any routing to the edge of the board. Drill/Hole is the distance from any routing to a hole in the board.
Sizes ‐ Set the minimum sizes.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٦١
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٦٢
• Restring ‐ Restring controls the size of the through‐hole pads/vias. Typically I just leave these at their default values.
Shapes ‐ Allows you to make pads have rounded edges. Typically I don't touch this one either.
Supply ‐ The checkbox allows you to turn on thermals for vias, and Thermal Isolation lets you pick the length of the thermal traces. Typically I don't touch these values at all.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٦٣
• Masks ‐When PCBs are fabricated, they have a coating that covers and insulates all of the board, except for areas designated by the stop mask. After fabrication, if they are being assembled by a machine (or a person with a reflow oven), a stencil is created and solder paste is applied via that stencil to the pads/vias that need to be soldered. Stop controls the size of the openings in the stop mask for the various parts, and Cream controls the size of the openings in the stencil. Once again, the default values work just fine for our typical usage.
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٦٤
• DRC check
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٦٥
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٦٦
• Rotate and move some components
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٦٧
• ratsnest
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٦٨
• Auto route
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٦٩
• After auto route
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٧٠
• Add missing wires on top layer
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٧١
Another trial
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Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٧٢
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And that’s the manual solution
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Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٧٥
Thanks,..
See you next week (ISA),…
Dr. Ahmed ElShafee, ACU : Spring 2017, Practical App EE IV ٧٦
