Yoshihiro Asano

Electric Production

◆ Making milling data

Download and edit png files.

We(from FablabKamakura) decided to make hello.ISP with resonator.
First, download traces and interior png files from Class page.
I add my name to original data with Illustrator.

Process files in Fabmodules.

Fabmodules is browser based wide-use CAM for digital fabrication machines.
This time I make .rml(Roland Mill) file from .png for SRM-20.

input format. → image(.png)
select png file in your PC.
output format. → Roland mill(.rml)

choose your machine → SRM-20
set x0,y0,z0 = 0.
change other properties.

click [calculate] button.
check the path and save it.

◆ Let's mill it with SRM-20!

stick copper board on waste board on base panel.
set base panel in SRM-20 main body.
set 1/64 bit with hex wrench.
connect SRM-20 to PC, and open software(V-panel for SRM-20).
move head and set current XY position as XY origin.
with holding mill, loosen fixing screw. then, hit the tip of mill against copper board softly.
set current Z position as Z origin.
load .rml file and run.

◆ My mistake

Outside path doesn't match. I don't know why, so I check .rml files.

How to read .rml file

I search and find some references.
According to this page...

PA - Pen Absolute
VS - Velocity Select
VZ - Velocity Select for Z-axis
MC - Motor Control / 0-OFF, 1-ON
PZ - set Z origin
PU - Pen Up
PD - Pen Down

Finally, I found the maximum value of Y-axis is strange.
Inner maximum is larger than outside of it!
So I think I mistook at setting origin.

Resolution issue

I made another data and run, then I found resolution is so important.
Different resolution makes defferent path, although other properties are same.

I made path file with not original resolution, and got some problem on board.
If you want to edit existing .png file, you have to set same resolution.

◆ Soldering

ATtiny44A
20MHz resonator
1μF capacitor
3.3V zener diord
Diodes have "Cathod band" that tell you which side is cathod.
mini USB port
pin head
chip resistor
You can know the value by checking number.

Soldering is from inside to outside!

◆ Programming

It needs long process..

Make ribbon cable

Through 6 cables to connector

Program firmware

I read FabAcademy's tutorial page.(walkthrough via Arduino UNO)
※Before start, you need to download Crosspack AVR X code fab_ISP_mac_0.8.2

unzip firmware, and go that directory via terminal.
type "make clean"
→ Error "Agreeing to the Xcode/iOS license requires admin privileges, please re-run as root via sudo."
→ I need to open X code, and agree terms(http://qiita.com/kazoo04/items/880283612abd85c0610a)
type "make fuse"
→ Error "avrdude: Error: Could not find USBtiny device (0x1781/0xc9f)".
→ I need to connect device.(=Arduino UNO)
Open "Arduino ISP" program from Sketch examples.
Connect Arduino and FabISP via ribbon cable.
- Slave Reset(RST) - pin10
- MOSI - pin11
- MISO - pin12
- SCK - pin13
- V - 5V , GND - GND
upload ISP program for Arduino
→avrdude: Error: Could not find USBtiny device (0x1781/0xc9f)
→ need to fix makefile configuration for avrdude

Comment out exisiting #AVRDUDE lines,and write following one.
"AVRDUDE = avrdude -c stk500v1 -b19200 -P /dev/tty.usbmodem1411 -p $(DEVICE)""
type "make fuse" again.

Finish

Get rid of 0 ohrm resiters, that'all!

Extra Error

In week8, I want to use FabISP as a programmer, but a problem happened.
If success, we can see FabISP in Mac System profiler > Hardware > USB > Hub.
But first time I cannnot find it.

I search for the way to solve and find Shino Onodela's page.
She wrote "Open terminal and type "system_profiler SPUSBDataType" .

After that, I can find it! yahoo!

◆ Data

trace png
trace rml
interior rml