Redraw the echo hello-world board,add (at least) a button and LED (with current-limiting resistor) check the design rules, and make it extra credit: simulate its operation
DESIGN the cirquit
I used Eagle to redesign the hello board.
Tutorials:
http://www.youtube.com/watch?v=1AXwjZoyNno
http://www.youtube.com/watch?v=1AXwjZoyNno
//Download the Eagle libraries
//Drawing the schematic
I followed the tutorials on the above the video to design my circuit. select all the components that you need from the libraries and do the schematic connecting them with "net".
//Creating the board and Routing the signals
In the board view distribute the components in that way that they create easy connections.Draw the routes. in my board i have used one button and one LED.
//Creating the milling files
Hide all layers except from the top layer. Go to file> export> image, choose 500 dpi resolution and check the button Monochrome. This is the "traces.png" file. After created the png traces file edit it in Photoshop and create a border by changing the canvas size expanding it 20px for each side of the area and paint it black. Paint the rest of the area white.This is the "outside.png" file.
TIPS:
This is the first time for me that I design a circuit. The design process is difficult if you are a beginner but after some time it is getting easier. Try to place the components close to the corresponding connections. This will help you to design the routes and avoid complicated paths.
MILLING
Details about milling and solder the board you can find here
/Modela milling machine
/copper plate
//mill out the traces of a circuit board(1/64th n-mill)
//cut out the board(1/32 bit)
SOLDERING
/Components:
//resonator(C = Q/V, I = C dV/dt)
//resistors(I=V/R)
//J1 ISP
//J2 FTDI
//capacitor(unpolarized)
//microcontroller(attiny44)
//button
//led
Files:
