Week5 : Electronics Production

• How to use milling machie(Roland DG SRM-20).
• How to flatten the surface of the sacrificial borad.
• How do aftertreatment with our equipment.
• Experiment: How much width can be processed by 1/64 end mill
(Our lab don't have 1/1000 end mill)
• 0.02mm(1/1000 inch) was the minimum line thickness
• 0.4mm(16/1000 inch) was the minimum for the gap between lines.

In System Program

ISP(In System Program) is to write a program to a micro controller after mounting it on an electronic circuit board. The advantage of this method is that there is no need to separately provide a writing step before assemble.
AVR is ISP micro controller.

In System Programmer or ISP programmer or AVR witer or AVR programmer

1. ATTiny 44 microcontroller (1 piece)
2. Capacitor 1uF (1 piece)
3. Resistor 100 ohm (2 piece)
4. Resistor 499 ohm (1 piece)
5. Resistor 1K ohm (1 piece)
6. Resistor 10K (1 piece)
7. 6 pin header (1 piece)
8. USB connector (1 piece)
9. jumpers - 0 ohm resistors (1 piece)
10. Zener Diode 3.3 V (2 piece)
11. Resonator　20MHZ(1 piece)
12. usb mini cable (1 piece)
13. ribbon cable (1 piece)
14. 6 pin connectors (attached to ribbon cable)(2 piece)

■Zener Diode Function

Normal diode works to prevent backflow of current.
But, Zener diode is the element that used for obtaining a constant voltage. This is the function that utilize the property that reverse current flows when apllying a certain voltage to zener diode.So, zener diode is mounted in the opposite direction to the ordinary diode.

■Capacitor Function

■Registor Function

The resistor resist the flow of electricity and has the role of adjusting to the current corresponding to the circuit.
We must pay attention to the description of the chip resistance code.
【In the case of normal number】
Last digit means multipulier of powe of ten. To put it simply, last digit means how many zeros to add.

113 -> 11×10³ =11kΩ
112 -> 11×10² =1.1kΩ

【In the case of including ”L” code】
Replace L with mΩ
11L =11mΩ
1L1 =1.1mΩ (If L is in the middle digit, Replace L to decimal point and mΩ)
10L5=10.5mΩ
【In the case of including ”R” code】
Replace R with decimal point
1R5 =1.5Ω
2R15=2.15Ω

Circuit data for RolandDG SRM-20(rml format file)

Interior data for RolandDG SRM-20(rml format file)

1. Remove foreign matter on the surface and oxide film.
2. Prevent oxidation of the joint.

1. Install X-code from Mac app store.
2. Download crosspack for mac from here and install it.
crosspack include avr-gcc, avrdude. avr-gcc is compier, avrdude is writing tool.


3. Get FabISP firmware for MacOS10.8.2 from here and move ZIP file to Desktop.
(firmware is software for controlling a computer system incorporated in an electronic device)
4. Open terminal and the following command is excuted.(For the subsequent procedures, refer to the procedure described here.)
   
   $ cd desktop
   $ unzip fabISP_mac.0.8.2_firmware.zip
   $ cd fabISP_mac.0.8.2_firmware
   
   following files were included.
   
   Makefile is a text file that describes rules such as compiling and installing e.t.c.
   
   
5. Connect ISP and AVR writer and PC
   
6. I used AVR ISP2 programmer, so I didn't need to edit Makefile. But if we use another ISP programmer, we have to edit following part of Makefile with texteditor.
   
   AVRDUDE = avrdude -c avrisp2 -P usb -p $(DEVICE) # edit this line for your programmer
   
   
   
7. Input following command. This commandd means execute "clean" target written in Makefile.
   
   $ make clean
   
   In Makefile, clean target is wrote like follows.
   
   following message was shown, it was success!
   rm -f main.hex main.lst main.obj main.cof main.list main.map main.eep.hex main.elf *.o usbdrv/*.o main.s usbdrv/oddebug.s usbdrv/usbdrv.s
8. Input following command. This commandd means execute "hex" target written in Makefile.
   
   $ make hex
   
   In Makefile, hex target is wrote like follows.
   
   following message was shown, it was success!
   avr-gcc -Wall -Os -DF_CPU=20000000 -Iusbdrv -I. -DDEBUG_LEVEL=0 -mmcu=attiny44 -c usbdrv/usbdrv.c -o usbdrv/usbdrv.o
   avr-gcc -Wall -Os -DF_CPU=20000000 -Iusbdrv -I. -DDEBUG_LEVEL=0 -mmcu=attiny44 -x assembler-with-cpp -c usbdrv/usbdrvasm.S -o usbdrv/usbdrvasm.o
   avr-gcc -Wall -Os -DF_CPU=20000000 -Iusbdrv -I. -DDEBUG_LEVEL=0 -mmcu=attiny44 -c usbdrv/oddebug.c -o usbdrv/oddebug.o
   avr-gcc -Wall -Os -DF_CPU=20000000 -Iusbdrv -I. -DDEBUG_LEVEL=0 -mmcu=attiny44 -c main.c -o main.o
   main.c:88:13: warning: always_inline function might not be inlinable [-Wattributes]
   static void delay ( void )
   ^
   avr-gcc -Wall -Os -DF_CPU=20000000 -Iusbdrv -I. -DDEBUG_LEVEL=0 -mmcu=attiny44 -o main.elf usbdrv/usbdrv.o usbdrv/usbdrvasm.o usbdrv/oddebug.o main.o
   rm -f main.hex main.eep.hex
   avr-objcopy -j .text -j .data -O ihex main.elf main.hex
   avr-size main.hex
   text data bss dec hex filename
   0 2002 0 2002 7d2 main.hex
   
9. Input following command. This commandd means execute "fuse" target written in Makefile.
   
   $ make fuse
   In Makefile, fuse target is wrote like follows.
   
   fuse is the bits of parameters that sets AVR chip operation.
   fuse setting items are as follows, but I do not understand the contents.
   

   name	function
   RSTDISBL	Reset pin prohibited
   DWEN	Debug Wire function permission
   SPIEN	Serial programming permission
   WDTON	Watchdog timer Always active
   BODLEVEL	Low voltage reset voltage level
   CKDIV8	Outgoing clock divided by 8
   CKOUT	CPU clock output from CLK0 pin
   SUT_CKSEL	Reset delay time setting

   following message was shown, it was success!
   ・・・・
   ・・・・
   ・・・・
   
   
   avrdude: verifying ...
   avrdude: 1 bytes of lfuse verified
   avrdude: safemode: Fuses OK (H:FF, E:DF, L:FF)
   avrdude done. Thank you.
   
10. Input following command. This commandd means execute "program" target written in Makefile.
    $ make program
    
    following message was shown, it was success!
    ・・・・
    ・・・・
    ・・・・
    
    
    avrdude: verifying ...
    avrdude: 1 bytes of lfuse verified
    avrdude: safemode: Fuses OK (H:FF, E:DF, L:FF)
    avrdude done. Thank you.
    
11. Verifing my ISP programmer is working
    
12. Remove the jumpers
    
    
    After remove jumpers this board should be used for ISP programmer.