Week07. Electronics design¶

This week, I did the following.

• Group Assignment

  • Verify the operation of the circuit created using the oscilloscope.

• Individual Assignment

  • Create circuits created by yourself.
  • Write the program to the circuit with the programmer created in Week 5

Group Assignment¶

The content of our group assignment is here
Week07 Group Assignment

Impressions¶

I thought that the output of the signal of the alphabet with a clear waveform is a good example that it can be understood that the digital data consists of all 1/0.

Electronics design¶

I designed the circuit using Eagle.
The procedure was as follows.
See the tutorial for usage

• Tutorial

Project Settings¶

1. Download the library to use with FabAcademy.

   • libraries

2. Import library

   • Options -> Directories -> Libraries
     • Enter the library path
     • 

3. The library is displayed.

   • 

Electronics Design¶

Schematic Design¶

1. Create New Project

   • File -> New -> Project
   • 

2. Create Schematic

   • File -> New -> Schematic

3. Add Modules (add command)

   • 
   • Too Many Modules…

4. Reduce Libraries

   • Select a library you do not use and select Use None
   • 
   • Reduced libraries
   • 

5. Write schematic…

   • 5V&GND not found

6. Reuse Libraries

   • 

7. Using Modules Lineup

   • 

8. Wiring while watching the following images

   • 

9. Just move it, the line does not come

   • 

10. When you move with MoveGroup, the line also comes in

    • 

11. Result

    • 

12. Check ERC

    • Tools -> ERC
    • 

From here, add LEDs and switches
Make the following wiring

• Connect LED to PA7

• Connect a switch to PA3, and if not pressed with a pull-up resistor, set the voltage to be applied.

• Add LED & Switch

  • The switch has a pull-up resistor so that the normal state is HIGH, and becomes LOW when pressed.
    If do not put anything, the state will not be stable.
  • 

• Overall

  • 

Board Design¶

1. Switch Board

   • 

2. Settings

   • Since the grid is not displayed, therefore, make display settings of the grid Draw a line every 0.05 inches
   • 

3. It was impossible to wire the switch to PA3
   Use the pin on the left according to the location of the switch

   • Change PA3 to PB3

4. Result

   • 

5. Check DRC

   • Perform design rule check
   • Change the clearance to 0.4 mm
   • 

6. Fix the error

   • Air Wire mean not connect
   • wire Stab mean overlap
   • 

7. Write Outline

   • 

8. Export

   • 800 dpi
   • monochrome
   • 
   • 
   • 

To Cutout¶

I Cut it like Week 5.

1. Cutout
   • 
2. Line up
   • 
3. Soldered
   • 
4. Connect
   • 

Programming¶

Using Tool & Software

• Programmer

  • FABISP (created in Week 5)

• Software for communication

  • FTDI USB serial conversion adapter
  • Need install Driver

• Test Programs

  • hello.ftdi.44.echo.c
  • hello.ftdi.44.echo.c.make

• Commands

  • hello.ftdi.44.program.png

• Communication Test Program

  • term.py

• FirstCommand

• make -f hello.ftdi.44.echo.c.make

  • 

• Second Command

• sudo make -f hello.ftdi.44.echo.c.make program-usbtiny-fuses

  • 

• Third Command

• sudo make -f hello.ftdi.44.echo.c.make program-usbtiny

• 

• Communication Test

• serial is not found

  • type “pip install pyserial”
  • 

• Retry Communication Test * I have been used Python3 but term.py is for Python2.

• I change term.py for Python3.

  • Changed term.py

• Program not work

• Error in serialwin32.py at line 308
  • data was need encode
• 

• 

• Hello world

• 

Files¶

• HelloEchoWorld.sch
• HelloEchoWorld.brd
• EchoHelloWorldTrace.png
• EchoHelloWorldRound.png