Week4：electronics production

Milling sequence

design the PCB layout with CAD software, such as Eagle, Autocad, ...ect, then, export the PCB layout with vector graphics format, such as .PNG file.
Import the image file into CAM software to generate G-code.
Import the G-code to the milling machine, secure the milling material, pick and set correct end-mill and mill it.

Milling the PCB with two different machine

In this weeks' assignment, I had tried to mill the PCB in two differents way: 1.Roland Modela MDX-20 with off-line version fabmodules.
2.Roland Modela SRM-20 with on-line HTML5 version fabmodules.

1.MDX-20

secure the fr1 PCB board with double-side tape.
use hex wrench to set-up the 1/64 milling tool.
use up/down button to control the drill, make sure the drill is close enough to fr1 board, release the drill little bit after confirm the drill is touch down to the board re-screw up it.
load traces
set the cutting z-asix(mm) to -0.4, click 'move to xmin,ymin' make sure the cutting area is fine, click make .rml to generate the cutting route and click 'send it!' to start the milling process.
after finish the traces, load interior
replace the milling tool from 1/64 to 1/32
set the z(mm) to -2
use up/down button to re-set the z-axis to 0
make .rml and send it!
after dreak off some milling tools and ta da!

after some try & error at soldering... I re-mill the PCB board in another milling machine.

Use Roland SRM-20 milling machine to cut the pcb

In fabacademy 2015, fabmodule had re-write to HTML5 online version. be aware the image need to convert to black and white image.
upload traces image to Fabmodules.org from browser.
select roland Mill(.rml), PCB traces(1/64)
select output machine to SRM-20, click 'calculate' button and 'save' button.
Secure the milling tool, open V-panel, click 'Contiune' radio button, use '-X down' button, click 'Set Origin Point Z' to set the z-axis to 0.
Click 'Cut' button and load the file that download from fabmodules.org
Click 'Output' button the begin the mill process.
repeat the process to finish the interior.

use soldering iron to connect the smd components

pick the correct components base on the hello ISP 44.board
set the temperature at 400 °C
melt a little bit on the soldering iron
scrape on the PCB
put the component on and use soldering iron to connect the component to pcb board.
connect ATTiny-44 first.
connect 0 ohm to SJ1 and SJ2
connect 101 smd resistor to 'R1 1k'
connect 511 smd resistor to 'R2 499'(because I can't find 499 resistor)
connect 101 smd resistor to R3 and R4
connect 103 smd resistor to R5
connect 3.3v transistor to D1 and D2
use multimeter to test the wire.

Programming the FabISP

Arduino as ISP

Prepare an Arduino as ISP
download Arduino IDE
open sample code 'ArduinoISP'
click 'upload' button, you will see RX / TX led blinking for a while.
after upload finished, take 10uF capacitor, plug the positive side to arduinos' 'Reset', nagative side to Gnd.
Note: during upload process, do not connect any wire except the USB cable... :p