Week 4 assignments:

Electronics Production:

From Fab Academy 2018 assignments
1. Characterize the specifications of your PCB production process.
2. Make an in-circuit programmer by milling the PCB.
Have:
shows how the board was made and programmed
Explanation of problems and how to solve them
Included a 'hero shot' of the board

For the assignment of week 4 which is to manufacture a programmer circuit, I fabricate the board by cnc milling.The milling machine allows the creation of 3D prototypes in materials such as plastics, wood, ABS (Acrylonitrile Butadiene Styrene), nylon, acrylics and modeling boards. It also allows the manufacture of printed circuit boards in bakelite for the development of electronic projects. In this case I used a Mdx-540 milling machine with the following characteristics:

- work area: 400 x 400 x 150 mm.
- Cutting material allowed: Plastic, MDF, Acrylic, bakelite
- Speed: 7.5m/s

Precision test (group assignment)

For the group assignment we have carried out a precision test of the Roland CNC milling machine.

1. TRACES.PNG.
2. BOARDONLINE.PNG.

1/64"

0.001"

For individual assignment I manufacture the FabTinyISP developed by BRIAN who makes an excellent explanation of the manufacturing process.

PCB Fabrication

The first thing to do is Download the PNG files for the traces and the board outline:

PCB Fabrication

The first thing to do is Download the PNG files for the traces and the board outline:

1. TRACES.PNG.
2. BOARDONLINE.PNG.

The next step is to generate the machining files, for this I use fabmodules.org, This platform allows generating the routes for milling, following is a detailed description of the steps to follow to generate the traces file and the cutting file.

  • 1. Import .PNG File
  • 2. Select output format and select Roland mill (.rml)
  • 3. Select Process and select PCB Traces (1/64)
  • 4. Edit parameters
  • 5. Save file

    • PCB TRACES

    To the PCB Cut I use the similar steps

  • 1. Import .PNG File
  • 2. Select output format and select Roland mill (.rml)
  • 3. Select Process and select PCB Outline (1/32)
  • 4. Edit parameters
  • 5. Save file

    • PCB OUTLINE

    The next step is to configure the milling machine

  • 1. put the bakelite piece in the machine fastened with double sided tape.
  • 2. Identify the location of the 1/32 and 1/64 tools
  • 3. Set XY Origin
  • 4. Set Z Origin with the sensor

    • Start milling

  • 1. Import .rml files
  • 2. Select tool
  • 3. Setting spindle rotating speed in 10000rpm
  • 4. Start milling
  • 5. Welding electronic components

    • List of electronic components

  • 1x Attiny45 Microcontroller
  • 1x green LED
  • 1x red LED
  • 2x 499 ohm resistors
  • 2x Resistances of 1k ohms
  • 1x 100nF Capacitor
  • 2x zener diode 3.3v
  • 2x Resistances of 49.9 ohms
  • 1x 3x2 pin header

    • Software Installation

    In this case I am using Windows OS, Is necesary install some drivers and software to upload the firmware to the board. For this I used de Brian tutorial.

    1. Install Git Download here

    2. Install the Atmel Studio 7 Download here

    3. Install GNU Make Download here

    4. Download avrdude, unzip the archive, and copy the archive inside to C:\Program Files. Download here

    6.Update PATH Download here

    Go to the Start menu and open the Control Panel, then go to System. From the left pane, choose "Advanced System Settings". Under the Advanced tab, click the "Environment Variables" button.
    Paste the ubication of the following files: avr8-gnu-toolchain, GnuWin32 and avrdude

    Sanity Check

    Download de firmware source code and extract the zip file Download here

    Edit Makerfile, open with SublimeText or another text editor

    Program the ATtiny45

    Connect to USB the two devices, open git-bash at the location where the firmware is located and run "make flash"

    Next, run "make fuses"

    Next, run "make rstdisbl"

    Finally, remove the bridge to turn the board into the programmer rather than the program

    Programmer validation

    You can validate the correct installation of the firmware in the devices administrator

    Include a ‘hero shot’ of the board

    Issues and remarks

    To solve this problem you must use a more updated version of the avrdude, in the following link you can find more information . The version that I use you can download it here

    DOWNLOADS