Week6

Electronics Design

Group Assignment Link

  • Use the test equipment in your lab to observe the operation of a microcontroller circuit board (in minimum,
  • check operating voltage on the board with multimeter or voltmeter
  • use oscilloscope to check noise of operating voltage and interpret a data signal)
  • Document your work (in a group or individually)

    • Assignment

  • Redraw one of the echo hello-world boards or something equivalent, add (at least) a button and LED (with current-limiting resistor)
  • or equivalent input and output, check the design rules, make it, test it
    • The software used to design electronic circuits is Eagle
    I started by referring to the Fab Academy Tutorial
    Eagle Tutorial Link

    This is 412 Hello-EcoBoard
    I'm not going to use a serial monitor
    So I don't need FTDI fins
    I will programming using the updi pin


    Attiny 412 pinout
    0, 1, 2 pins are LED
    4pin is a button
    5pin will connect UPDI


    First open Eagle and File > New > Schematic


    1. add component (Ctrl + Shift + A)
    2. draw line (Alt + N)
    3. name
    Draw a circuit diagram in the order above


    When searching for components, it's easy to search by attaching a '*' on both sides
    Pre-add 1206 C and R used in fablab
    [SnapEDA] - This site makes it easy to find the ibr file containing the desired footprint
    [FAB.ibr]
    [ATtiny412 datasheet]
    [ATtiny412.lbr]


    I've added 3 LED and button,
    I found the resistance value of 1k through this link
    and used a pull-up register
    [What is pull-up register?]- I referred to Ji-hwan Kim's works



    design rule check (Ctrl + Shift + E)
    Make sure there are no errors through the and move on to the board
    (You can ignore the warning)




    Let's move on to the board
    First, set the design rules
    In the [4th week of the group work], we learned the minimum value of 0.4mm.
    Set all settings to 0.4mm


    Place the Capacitor closest to MCU VCC and GND to maintain potential difference
    Make the yellow box efficient after connecting the wires


    gbr file export
    File > CAM Processer


    Print through (Ctrl + p) before export
    True-size prints can help you size up real-world components and reduce mistakes


    Check it again on the top copper and press process job


    The gbr file is a great formate that includes both an outline, holes and a copper


    coin-sized circuit board
    Milling took about 15 minutes
    Clearance should be given at least 0.5mm to make it easier to soldering
    Bantam PCB use Link(week4 group work)


    To check components our 1206 resistance is out of stock
    So i use a different resistance


    The LEDs are on + and - so be careful
    Check the multimeter for the direction of the light
    Let the red part go to the VCC


    completed circuit board

    File
    circuit board SCH file
    circuit board BRD file