My notes :
step 1 : (After installing it...) First time start up eagle asks you to define a place when it can store future files.
step 2 : Download the library needed. (fabacademy library).
Put the file's in the defined eagle folder. (in my case: in documents folder).
step 3 : Turn off all the regular library's (don't want to see what you don't use).
Eagle library's folder > right click, choose 'use none'.
step 4 : Load the library's you do want to use.
Fab.lbr > right click > use.
regular library add > supply
regular library add > led
step 5 : make a new project
projects > eagle > right click > new project (and name it).
Double click to open.
step 6 : (Like in cmd) use typing to command. (in the bar in center top of the screen).
Type 'add' + enter.
In this new popped-up 'add' screen, find the 'tiny 44'.
Click ok and click again to place it.
continue collecting all the parts needed.
(example board:
http://academy.cba.mit.edu/classes/embedded_programming/hello.ftdi.44.png)
After placing your parts, also place a vcc and a gnd (from the supply library).
step 7 : Use the wire tool (from the toolbar) to connect al the parts.
Click on starting point once, click once more if you want the line to continue at a different angle, double click to close.
step 8 : When done with the basics, add a button, led and resistor on the board.
Because the micro controller has 3 legs left to use, I decided to put on 3 led's in stead of one.
This also means I need 3 resistors, one for each led.
When placing a LED, it also needs a resistor.
Check the datasheet of the led to calculate which resistor you need.
note: every colored led has a different datasheet
http://en.wikipedia.org/wiki/Ohm's_law
Law of Ohm : U = I x R (spanning = stroom x weerstand)
I = Ampere (stroom)
U = Volts (spanning)
R = Ohm (weerstand)
Red led :
http://www.digikey.com/product-details
Datasheet : http://optoelectronics.liteon.com/_ltst-c150ckt.pdf
info from datasheet : Forward Voltage > 20mA and the Typ. > 1.8
Step 1 : Start with calculating how much volt is left after it went trough the resistor:
5V (starting point is the micro controller) - 1.8V (the resistor) = 3.2 Volt
Step 2 : Calculate U = I x R (Volt = Ampere x Ohm)
Translate the 20mA to 0.02A.
3.2V = 0.02 x ...?
(switch the numbers around to get the right answer, like c = a x b).
3.2 / 0.02 = 160 Ohm.
To find which components are available in the fabLab > check the inventory :
https://docs.google.com/spreadsheet/pub
http://www.digikey.com/product-detail/en/LTST-C150GKT/160-1169-1-ND/269241 | 160-1169-1-ND |
LED GREEN CLEAR 1206 SMD | FV 2.1 = 20mA
http://www.digikey.com/product-detail/en/LTST-C150KFKT/160-1403-1-ND/386757 | 160-1403-1-ND |
LED YELLOW ORANGE CLEAR 1206 SMD | FV 2.0 = 20mA
http://www.digikey.com/product-detail/en/LTST-C230TBKT/160-1889-1-ND/3306146 | 160-1889-1-ND |
LED BLUE CLEAR 1206 REV MT SMD | FV 3.3 = 20mA
step 1 : route the board.
After completing the schematic drawing, switch to the board design.
Place all the parts where you like them to be, and draw the routing lines.
(use the ratsnest tool to get the yellow helper lines to be less chaotic.)
step 2 : When happy with the layout, you check the design rules (click the button in the toolbar).
Here you can set up the rules, (also load it/save it).
These rules will check for you if there are any design flaws in the layout of the board.
(The settings are about the width of the cutter head, and general setting of (in my case ) the Modela.)
step 3 : If any error occur, troubleshoot them.
Edit the design of the board, till no more design rule messages appear.
When done you can change the white outline around the board design to the desired (as small as possible) size.
step 4 : make the png files (at 1200 DPI, monochroome).
(one of the traces and one of the board outline).
Use the layer button in the toolbar to toggle the views correct for the exporting.
File > export > image.
Open up the board png in a pixel program (like paint).
Fill up the center of the board with white pixels, and save it.
(this makes sure that the Modela will cut around the outline of your board).
Step 5 : Mill the board & solder the components.
(And check for shorts.)