I am first year doing software engineering. my professor wants me to design the schematic diagram, but I am the little bit confuse that what actually going on.
so please try to help me as we haven't study yet this material in the class




Design Steps
Eagle Schematic Setup
EAGLE is very popular and has lots of tutorials online. You are responsible for doing your own research to get this working.


These steps will define the electrical connections between components and add labels to the schematic. The board layout and the trace connections will be done later.

1. Install the free version of EAGLE from here: http://www.cadsoft.de/download/
   
   
2. Create a new EAGLE schematic.
   
   
3. To the schematic, add the following. Do not worry about importing third-party device libraries or creating your own libraries. You should be able to use only the supplied device libraries that come with EAGLE.
   
   
   1. The Microchip PIC18F452, 40DIP package. If this exact device does not exist in the Microchip device library, choose the one that looks the closest based on pin count and pin names.
      
      
   2. A polar capacitor close to one of the Vdd pins. This will be used as a “filter capacitor” that eliminates noise from the voltage supply.
      
      
   3. Two non-polar capacitors close to the OSC1, OSC2 pins, respectively. These will be used as crystal stabilization capacitors.
      
      
   4. 2 two-pin screw terminal block. They look like this:
      
      They are used to screw in bare wire to a board. The first terminal block will be to accept ground and +5V supply input wires. The second terminal block will be to accept wires for a signal output.
      
4. Connect the schematic wires (“nets”) such that:
   
   
   1. The crystal, stabilization capacitors, OSC1 and OSC2 pins are connected per Chapter 2.2 of the μC spec.
      
      
   2. One terminal of the supply block is connected to the positive side of the filter cap, and all device Vdd pins. To this net, also add a +5V or Vdd supply symbol.
      
      
   3. The second terminal of the supply block is connected to the negative side of the filter cap, all device Vss pins, and the second pin of the output terminal block. To this net, also add a ground supply symbol.
      
5. Choose value text for all components. This value text will be set to a DigiKey part number (usually ending in -ND) for the component.
   
   
   1. All components must be in-stock.
      
      
   2. All components must be active except for the PIC18F452, which is marked “not for new designs”.
      
      
   3. All components must be the cheapest possible component meeting requirements.
      
      
   4. For you to more easily understand the appearance of the components, and more easily route the PCB, use through-hole (not surface-mount) packages for all components.
      
      
   5. The capacitance for the filter cap will be anywhere from 1-50μF. Select a polar aluminum cap tolerating more than 5Vdc.
      
      
   6. The crystal should be selected for 8MHz operation (HS mode).
      
      
   7. The oscillator stabilization caps must be selected per chapter 2.2 of the spec. Use non-polar ceramic caps.
      
6. Ensure that all components in your schematic have the name and value visible.
   
   
7. Add meaningful names to all nets, with labels visible.
   
   
8. Add a frame with title block around your schematic. Add your name.

 

First off this is homework so it belongs in the homework forum. Since it is homework, you have to show your work. What have you done so far?

In my opinion, Eagle is one of the hardest to learn design applications out there. Do you have to use Eagle?

 

my professor wants me to design the schematic diagram, but I am the little bit confuse that what actually going on.

Download and install the program. Ask questions when you get stuck.

Eagle isn't really that hard to learn. Your instructor wouldn't ask you to do it if it was that difficult.

 

Download and install the program. Ask questions when you get stuck.

Eagle isn't really that hard to learn. Your instructor wouldn't ask you to do it if it was that difficult.

+1. Plus, you have the step by step guide right there in your first post.
Open a new schematic then click the ADD button to go to the list of library components. Eagle lets you browse and add to the schematic. You won't find many useful part numbers in many cases, especially connectors but do what I do, just add all the potential candidates and examine them in the PC layout editor. For example the screw connectors come in metric and inch pin spacings. Look at the drawing on the datasheet for the part. On the PC layout use the cursors or grid to measure things like pin spacings etc. until you are sure that you have the right pattern the delete the others. When you have all of your parts go to the schematic and wire them up.

Eagle uses NETS - a net is one complete connection between 2 or more pins. Use the WIRE (not line) function to connect all of the pins in one net. As you make connections, you will see point-to-point connections being made on the PCB. These 'air wires' are not traces, they just indicate connections to be made. Back on the schematic,use the LABEL command to place a visible label showing the net name on the wires. Eagle gives each net a default name. Use. the NAME command to name your nets.

You'll find frames for the schematic in a library folder named .. uh.. FRAMES. Add a frame that fits your desired page size - I like 11x17 - then use the TEXT command to fill in the title block.

While you are doing all of this pay attention to the drawing layers. Text goes on the SYMBOLS layer, your connections go on the NETS layer. Once you are done, run a DRC and fix up any missing pins etc.

You won't get this right the first time and it will take some practice to get a good looking, accurate skiz. My first outings with EAGLE were not without issues, even though I had used several others before. Just get started, save your work in increments and get with it.

Good luck!

 

Kicad is also a good free S/W package and is not restricted in board size.
If the option for other than Eagle is there.
Max.