Week 4

The assignment for this week was to make the FabISP in-circuit programmer. The first step was to mill the PCB. I downloaded the two milling files, the first one is the Traces and the second is Interior.

With the Traces file I set the milling machine to the 1/64" endmill and milled the inner traces of the PCB. After that I changed to the 1/32" endmill, loaded the Interior file and milled out the board.

This is a list of all the components to use for the FabISP.

USB - mini UX60A-MB-5ST

2 DIODE ZENER 3.3V BZT52C3V3-7-F

atTiny44 ATTONY44A-SSU-ND IC MCU 8BIT 4KB FLASH 14SDIC

20MHZ Resonator XC1109CT-ND CER RESONATOR 20.00MHZ SMD

0 OHM Resistor RC1206JR-070RL

499 Resistor RES SMD 499 OHM 1% 1/4W 1206

1K Resistor RES SMD 1K OHM 1% 1/4W 1206

10K Resistor RES SMD 10K OHM 1% 1/10W 0603

2 100K Resistors RES SMD 100 OHM 1% 1/4W 1206

6 pin Header 609-3487-1-ND BERGSTIK HDR 6POS .100" DR SMT

Next I wanted to design my own ISP. I started working with Eagle and reverse engineered the schematics of the board. These are my SCH and BRD files.

I designed the board in a long thin shape so I will be able to vinyl cut it and make it as a bracelet.