_REDRAWING ECHO HELLO-WORLD BOARD
This week's assignament was about redrawing the echo hello-world board, by adding at least a button and a LED light, and stimulate the operation after.
To redraw the board, I downloaded EAGLE CadSoft which is a PCB Design Software.
After downloading EAGLE, I added the fab components library to the software in the schematic window, Library tool bar + Use and loaded it. Once in the schematic view, just by typing "add" on the command bar the components appear and I started designing the board.
Once the components are all in the schematic and wired, the switch to board button, took me to the Board view and organized the components according to its conections and polarity.
_MILLING THE BOARD
Once the board was ready, I milled it in the Modela machine BUT after setting the milling presets for the trace (1/32), I made the mistake of giving the Z (mm) value: 0. Never again! the right value: -0.0; instead of milling it was cutted, and the mill broke. What is more, for milling the interior I did it in two times, first with a -0.0 z(mm) value and the second time with a -0.1 z (mm) value. This was the result:
A lot of wires were broken, just in case I checked it with the voltimeter, and they were not conected indeed. So, the second time, I corrected these values, and for milling the interior traces I gave the z (mm) -0.0 value and it looked ok so I left it as it was.
Finally, I soldered the components:
Microcontroller (ATTINY44A)
1 Capacitor 1uf
2 10K Resistors
1 499ohms Resistor
6 pin programming header, for programming the board
20Mhz Resonator
Swith button (OMARON)
1 Led light: red in this case
FTDI Header, which allows the comunication between the board and the computer
.png image exported from Eagle schematic board, only with the top layer on and edited in gimp.
First attempt to mill the board.
Second board milled with the components soldered.