PIC PCB

From Ece

Introduction

In an effort to simplify development with the PIC, a basic, all-in-one PCB will be developed that houses programming and communication functionality and a power supply.

Parts List

• TTL-232R (USB -> Serial) datasheet.
• PICKit 2 datasheet.
• PIC24 datasheet.

ESOS

• PIC18 ESOS source code
• ESOS API and example code

Misc

• Proposed C coding standard

Eagle PCB Tips

Schematic Smash

"Smashing" a part means separating the part's package, name, and value. The name and value can now be moved, but are kept relative to the package.

1. Select the Group tool and highlight entire board
2. Select the Smash tool
3. Click on the highlighted group and press CTRL + Right click or Right click and select "Smash: Group" from the menu

Font Properties for Manufacturing

Since manufacturers prefer all silk-screen text to be in a line segment format, the font needs to be changed to "vector."

1. Before editing font properties, the package needs to be Smashed. See the section on Smashing the entire board.
2. Use the Group tool to select the entire board
3. Select Change -> Font -> Vector
4. Right click the highlighted group and select "Change: Group" from the menu

Manual Character Width

Eagle actually calculates a character's line width as a function of its size. For legibility, BatchPCB recommends 8 mil line width. For example, if the character "size" (height) is 32 mils, its "ratio" needs to be 25% in order to have a line width of 8 mils. To change the properties of all displayed text:

1. Use the group tool to select the entire board
2. Select Change -> Size -> 32
3. Right click on the highlighted group and select "Change: Group" from the menu
4. Select Change -> Ratio -> 25
5. Right click on the highlighted group and select "Change: Group" from the menu