Week04: Electronics Production

Assignment


Make milling data

I chose hello.ISP.44.res board. Then I put a mark on to identify which is mine.

Download and opened hello.ISP.44.res's traces data by GIMP.

Add a mark on and save as PNG file. Ensure the size and resolution is same as original one.
download .xcf
download .png

I used Fab Modules to make milling data for SRM-20.

Traces
input format -> image(.png) -> select png file
output format -> Roland mill(.rml)
process -> PCB traces(1/64)
machine -> SRM-20
Set x0(mm) -> 0, y0(mm) -> 0, z0(mm) -> 0
cut depth(mm) -> 0.2
Click calculate
Click save
download .rml


I also used hello.ISP.44.res's interior.
Interior
input format -> image(.png) -> select png file
output format -> Roland mill(.rml)
process -> PCB traces(1/32)
machine -> SRM-20
Set x0(mm) -> 0, y0(mm) -> 0, z0(mm) -> 0
cut depth(mm) -> 0.6
Click calculate
Click save
download .rml

Milling

I used SRM-20.


Press to power on (green light)


Click VPanel for SRM-20 icon


then open window and press view to move the head


Set endmill with an allen wrench
Endmills, 1/64 and 1/32.


Move the head to the place where I want to start milling on PCB.(1)
Set Origin Point X/Y.(2)


Set Z point by touching endmill to PCB.

Click Cut to open to choose file
(1)Delete all
(2)Add
(3)Output
then start milling.


Milling


After finishing traces by 1/64, start interior by 1/32 using same XY Origin Point. Set Z Origin Point again for 1/32.

Milling finished.


Use Solvent to take out


My fabISP


Soldering

After washing FabISP, put flax on, then start soldering.
Solder USB jack first, Attiny 44, other tips and Pin header the last.
R1: Resistance 1k [ohm](1000) x 1
R2: Resistance 499 [ohm](4990) x 1
R3,R4: Resistance 100 [ohm](101) x 2
R5: Resistance 10k [ohm](1002) x 1
C1: Capacitor 1u [F] x 1
D1,D2: Zener diode 3.3 [V] x 2
IC1: Attiny 44 x 1
20MHz: Resonator 20M[Hz] x 1
SJ1,SJ2: Wire x 2
J1 ISP: Pin header 2x3 x 1
J2 USB: USB jack x 1


Preparing an ISP

I used Arduino Uno as an ISP to program Fab ISP.
( ISP = In-system Programmer)

In Arduino IDE, Open File -> Examples -> 11.ArduinoISP ->ArduinoISP

Connect Arduino to Mac, then upload ArduinoISP to Arduino.

Preparing make Fab ISP as programmer

Download and Install CrossPack for AVR to Mac.

Download and Install Xcode to Mac.

To find my PC's port, open the Arduino IDE, and check under Tools > Port.
The port is /dev/cu.usbmodem1421.

Download firmware.zip and unzip on Desktop which is fabISP_mac.0.8.2_firmware.
Open fabISP_mac.0.8.2_firmware -> Makefile
In Makefile, add a line below and save;

AVRDUDE = avrdude -c stk500v1 -b19200 -P /dev/cu.usbmodem1421 -p $(DEVICE)

Two "AVARDUDE = " line above should be commtent out by using #.

download Makefile

Confirm the PATH through
From Tarminal,
$ echo $PATH
/Library/Frameworks/Python.framework/Versions/3.5/bin:
/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:
/usr/local/CrossPack-AVR/bin
/usr/local/CrossPack-AVR/bin is added.


Wiring Arduino to FabISP

Read connecting information in ArduinoISP.

Wiring Arduino to FaB ISP
Arduino Uno Fab ISP
10 RST
11 MOSI
12 MISO
13 SCK
5V V
GND GND



Program the FabISP

From Terminal,
$ cd Destop/
$ cd fabISP_mac.0.8.2_firmware/
$ make clean
$ make hex
$ make fuse
$ make program

This is the response from system.


Verify FabISP

Apple menu on tool bar ->about this mac -> system report -> System Profiler -> Hardware -> USB -> Hub
"FabISP" should be listed in the hub menu, but still Arduino Uno instead.

Desolder two jumpers, SJ1 and SJ2.


Then "FabISP" is in the list.


Make cable
I checked the cable by using tester.

My FabISB


Using AVRISP

When AVRISP is used instead of Arduino, connect two wires as below. One is PC to AVRISP. Another Mini USB cable from PC is needed to supply power to FabISP.


Use different line of "AVRDUDE =" in Makefile.