FabISP Production and programming

The FabISP is an in-system programmer for AVR microcontrollers, designed for production within a FabLab. To Make an in-circuit programmer by milling the PCB ,I Download the Board Files and Mill the Board with Roland SRM-20 Milling Machine. this is the choice model: FabOptimus (R_pullup=1.5K) http://fab.cba.mit.edu/classes/863.16/doc/tutorials/FabISP/FabISP_Demystified.html

FabISP: Programming

I been followed the tutorial on : http://archive.fabacademy.org/archives/2016/doc/programming_FabISP.html 1) Download the software :http://winavr.sourceforge.net/download.html 2) Download the Fabisp drivers https://learn.adafruit.com/usbtinyisp/drivers 3) Download the FabISP Firmware :http://academy.cba.mit.edu/classes/embedded_programming/firmware.zip 4) Plug in another FabISP or USBtiny programmer 5) Install the drivers:

Circuit Board Traces

I Download the traces png and Mill using the fab modules and a 1/64" bit. Design Files : http://fab.cba.mit.edu/classes/863.16/doc/tutorials/FabISP/FabISP_Demystified_files/FabOptimus_Traces.png

Board Outline

I Download the outline png and Mill using the fab modules and a 1/32" bit. Design Files : http://fab.cba.mit.edu/classes/863.16/doc/tutorials/FabISP/FabISP_Demystified_files/FabOptimus_Outline.png

Generate file for milling machine

From site : http://mods.cba.mit.edu/

Setup of milling machine

to proceed to the milling of the pcb board, I clean the working plane and load the 1/64 bit for the tracks, then insert the parameters for the machining, gauge the z axis and set the origins of the piece to be mill.I had no problem.When it's finished I clean the pcb board.

below is the programming process in windows powershell like administra-

tor, in the firmware folder:

PS C:\Users\UTENTE\Desktop\FAB ACADEMY 2018\FAB ISP OPTIMUS\firmware\fabISP_mac.0.8.2_firmware> .\makefile clean PS C:\Users\UTENTE\Desktop\FAB ACADEMY 2018\FAB ISP OPTIMUS\firmware\fabISP_mac.0.8.2_firmware> make hex 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    2016       0    2016     7e0 main.hex PS C:\Users\UTENTE\Desktop\FAB ACADEMY 2018\FAB ISP OPTIMUS\firmware\fabISP_mac.0.8.2_firmware> make fuse avrdude -c usbtiny -p attiny44  -U hfuse:w:0xDF:m -U lfuse:w:0xFF:m avrdude: AVR device initialized and ready to accept instructions Reading | ################################################## | 100% 0.02s avrdude: Device signature = 0x1e9207 avrdude: reading input file "0xDF" avrdude: writing hfuse (1 bytes): Writing | ################################################## | 100% 0.02s avrdude: 1 bytes of hfuse written avrdude: verifying hfuse memory against 0xDF: avrdude: load data hfuse data from input file 0xDF: avrdude: input file 0xDF contains 1 bytes avrdude: reading on-chip hfuse data: Reading | ################################################## | 100% 0.02s avrdude: verifying ... avrdude: 1 bytes of hfuse verified avrdude: reading input file "0xFF" avrdude: writing lfuse (1 bytes): Writing | ################################################## | 100% 0.02s avrdude: 1 bytes of lfuse written avrdude: verifying lfuse memory against 0xFF: avrdude: load data lfuse data from input file 0xFF: avrdude: input file 0xFF contains 1 bytes avrdude: reading on-chip lfuse data: Reading | ################################################## | 100% 0.00s avrdude: verifying ... avrdude: 1 bytes of lfuse verified avrdude: safemode: Fuses OK avrdude done.  Thank you. PS C:\Users\UTENTE\Desktop\FAB ACADEMY 2018\FAB ISP OPTIMUS\firmware\fabISP_mac.0.8.2_firmware> make program avrdude -c usbtiny -p attiny44  -U flash:w:main.hex:i avrdude: AVR device initialized and ready to accept instructions Reading | ################################################## | 100% 0.02s avrdude: Device signature = 0x1e9207 avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed          To disable this feature, specify the -D option. avrdude: erasing chip avrdude: reading input file "main.hex" avrdude: writing flash (2016 bytes): Writing | ################################################## | 100% 2.23s avrdude: 2016 bytes of flash written avrdude: verifying flash memory against main.hex: avrdude: load data flash data from input file main.hex: avrdude: input file main.hex contains 2016 bytes avrdude: reading on-chip flash data: Reading | ################################################## | 100% 1.37s avrdude: verifying ... avrdude: 2016 bytes of flash verified avrdude: safemode: Fuses OK avrdude done.  Thank you. avrdude -c usbtiny -p attiny44  -U hfuse:w:0xDF:m -U lfuse:w:0xFF:m avrdude: AVR device initialized and ready to accept instructions Reading | ################################################## | 100% 0.01s avrdude: Device signature = 0x1e9207 avrdude: reading input file "0xDF" avrdude: writing hfuse (1 bytes): Writing | ################################################## | 100% 0.02s avrdude: 1 bytes of hfuse written avrdude: verifying hfuse memory against 0xDF: avrdude: load data hfuse data from input file 0xDF: avrdude: input file 0xDF contains 1 bytes avrdude: reading on-chip hfuse data: Reading | ################################################## | 100% 0.00s avrdude: verifying ... avrdude: 1 bytes of hfuse verified avrdude: reading input file "0xFF" avrdude: writing lfuse (1 bytes): Writing | ################################################## | 100% 0.00s avrdude: 1 bytes of lfuse written avrdude: verifying lfuse memory against 0xFF: avrdude: load data lfuse data from input file 0xFF: avrdude: input file 0xFF contains 1 bytes avrdude: reading on-chip lfuse data: Reading | ################################################## | 100% 0.02s avrdude: verifying ... avrdude: 1 bytes of lfuse verified avrdude: safemode: Fuses OK avrdude done.  Thank you.

it seems that everything went well!

now I can test the pcb card, then connect the usb cable to the mini usb port of the card and connect it to the computer….

Houston we have a problem!

Now I can test the pcb card, then connect the usb cable to the mini usb port of the card and connect it to the computer, but it is not detected and therefore does not work! I'm looking for a solution and I think the card has been programmed so the problem could only concern the USB connector due to a cold soldering. I then take the pcb card and review the tracks of the mini usb connector.Al the next attempt to connect with the computer the card finally works! Problem Solved!!!