WEEK04-ELECTRONICS PRODUCTION

Part 1 Machine PCB

1. Download PNG files of ISP.

ISP should be make this week. Download the PNG files for the traces and the board outline.

The picture of trace and board outline is high resolution.

The dark part is PCB with copper, the white part can't be removed.

2. Transform the picture to the code that can be read by mill machine.

Fab Modules is a excellent online convert tool. Click on http://fabmodules.org/

Set input format as PNG, choose the trace picture.

Set output format as Roland mill.

Then set the speed of moving, it should be 2 mm/s.

Choose milling cutter, it's very smart here, there are PCB traces outline and rough cut finish cut, just choose you will do. Choose PCB traces(1/64), means the diameter of milling cutter is 1/64 in.

Calculating the milling path, there are some parameters should be set. Don't change the recommended parameters untill the quality of cutting is not good.

Click on calculate, then the path was showed in 3D.

Check it if no problem click on save.

Repeat input PCB outline, but set speed as 3 mm/s and choose milling cutter as PCB outline (1/32).

Click on calculate and save and copy them to SRM-20 control computer.

3. Prepare for cutting.

Cut PCB with SRM-20 mill machine. Stick adhesive tape on the back of PCB.

Stick full of the PCB, ensure there is no overlap.

Choose milling cutter. Use 1/64 first and then 1/32 for cutting outline.

Load mill cutter, very carefully here, for the cutter is easy be broken.

Set origin XY, should be very carefull, make sure the cutter is far from PCB,if the cutter hit the PCB it will be broken. Choose a place and click on "Set Origin Point"-"X/Y".

Set origin Z, also should be very carefull, down the cutter when it is close to PCB about 2 mm loose the mill support then tighten it after the cutter touch PCB. Click on "Set Origin Point"-"Z".

4. Add file and cut.

Add file, and click "output", then the machine will work, if the door of machine is open an warning will appear.

Some information is showed on the panel like the position of cutter, speed of spindle.

Nice cutting. After cutting PCB trace need to change cutter, and set origin Z.

5. Take PCB out after cutting.

If the cutting is done, clear it.

Use tools to remove the tap on back of PCB and deburring with sandpaper. A nice PCB was fabricated.

Trace rml Download

Outline rml Download

Part 2 Solder

1. Prepare the components.

We need chip, resistors, diodes, led, capacitor and pin header.

2. Prepare for soldering.

We need soldering station and accesory. The smoke is harm to people, so we need a fan to suct.

Soldering.

3. Have done it

Soldering is a hard work for me, it takes me a long time.

The directions must be sure when soldering diodes.

Pay attention when soldering the led, if the direction is not right it won't be on.

4. Remove the copper on ISP head.

Remove the copper on ISP head, if not it may short.

5. Some bad thing happened.

I get a wrong resistors, it should be 499 Ω，I found the lable showed 4993 and it means 499×10^3.

I have to take it down and change it. And unfortunately, I burn the led. No RED and BLUE green, change them as blue and yellow.

Finally, I finished.

6. Check it.

Plug in computer then the blue LED is on.

Part 3 Programming

1. Download software and setup them.

It is complicated to programe when the system is windows need to setup 5 software. Then check them as tutorial.

Download the fts_firmware and put it on desktop. Then open the makefile and change the programmer name. Open Git Bash, and cd to the folder, like "user/desktop/fts_firmware_bdm_v1".

2. Make

"make clean", "make", "make flash", "make fuses"

3. Broke the joint

The programmer was made successfully, but one more thing need to do breake the joint. After doing this instructor Mr Sili help to test on his computer, it worked.

Download