7. Electronics design¶

Instruction¶

Group Assignment

Here

Individual 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.
Optionally, simulate its operation.

What I did this week¶

Test the operation of a circuit board by multimeter and oscilloscope → Group Assignment
Design: Redraw the circuit board with botton and LED → in this page
Check: Design Rule Check and make the circuit board → in this page
Make: Assemble electronic components to the board→ in this page
Test: Write programme to the microcomputer on making breakout board→ in this page

2. Design: Redraw and design in Eagle¶

The board image i will make¶

a button
LED (with current-limiting resistor)

ATTINY 1614

add Library
eagle/fab.lbr
new > schematic
“add” parts I will use

FAB > LEDFAB1216 FAB > R > R1206FAB(Register) FAB > SW_SWITCH_TACTILE_6MM FTDI-SMD-SHAPE UPDI_3POS_SMD_SHAPE PINHD-1X02 CAP_UNPOLARIZEDFAB 5V GND (Version 1)

net and move components in order

set input “Value”

switch to board mode and put these parts in order

drawing by “Route Airwire”

draw the layout by “POLYGON”

Assign Shortcut of making hole to F12 in accordance with this instruction

option > assign > new

SET COLOR_LAYER 116 0;SET FILL_LAYER 116 1;run drill-aid 0

making holes by press “F12”

hide layers and display only top and pats

3. Check: DRC (Design Rule Check)¶

Validating your work through the use of a Design Rule Check (DRC).

press drc and set clearance parameters “16mil”

press command : drc

After that, nothing is displayed. Turns out there was no problem.

Draw pathroute by mods in accordance with exported the design data¶

select top and pad → export as filename “top”

file > export > image

Export “top.png”image

display only document and centerdrill

export image as filename “holes_outline.png” in the same setting

import the image to mods and calculate pathroute by mods

Size: 46.3 x 35.2 mm

launch the image in gSender and connect PC to CNC machine

CNC machine I used : Genmitsu PROVerXL 4030

press homing
install endmill (1/64) and set its position
load file .nc and start job
image of milling by 1/64

after detaching endmill (1/64), install endmill (1/32) and set its position
video of milling by 1/32

done

At the end of milling, unfortunately the circuit board came un stick because the board wasn’t fixed enough by glue. So I couldn’t cut the board completely. As the cutting process was almost finished, I decided to cut the remaining by pliers.

4. Make: Assemble electronic components to the circuit board¶

export to “bom” from brd and display parts list

collect components

Soldering

5. Test: Write programme to the microcomputer on making breakout board¶

setup ATtiny1614

File -> PreferencesAdditional Board Manager URLs: http://drazzy.com/package_drazzy.com_index.json

Boards Manager

write echo program to the breakout board

//
// hello.t1614.echo.ino
//
// tiny1614 echo hello-world
//    115200 baud
//
// Neil Gershenfeld 12/22/19
//
// This work may be reproduced, modified, distributed,
// performed, and displayed for any purpose, but must
// acknowledge this project. Copyright is retained and
// must be preserved. The work is provided as is; no
// warranty is provided, and users accept all liability.
//

#define max_buffer 25

static int index = 0;
static char chr;
static char buffer[max_buffer] = {0};

void setup() {
   Serial.begin(115200);
   }

void loop() {
   if (Serial.available() > 0) {
      chr = Serial.read();
      Serial.print("hello.t1614.echo: you typed \"");
      buffer[index++] = chr;
      if (index == (max_buffer-1))
         index = 0;
      Serial.print(buffer);
      Serial.println("\"");
      }
   }

source

setting in arduino

complete writing

Check with serial monitor by connecting to serial
Confirmation that echo is returned without any problem.

write the programme of Blink of Red/Yellow/Blue LED in turn

// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin LED_BUILTIN as an output.
pinMode(1, OUTPUT);
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);

}

// the loop function runs over and over again forever
void loop() {
digitalWrite(1, HIGH);   // turn the LED on (HIGH is the voltage level)
delay(1000);                       // wait for a second
digitalWrite(1, LOW);    // turn the LED off by making the voltage LOW
delay(1000);                       // wait for a second

digitalWrite(2, HIGH);   // turn the LED on (HIGH is the voltage level)
delay(1000);                       // wait for a second
digitalWrite(2, LOW);    // turn the LED off by making the voltage LOW
delay(1000);                       // wait for a second

digitalWrite(3, HIGH);   // turn the LED on (HIGH is the voltage level)
delay(1000);                       // wait for a second
digitalWrite(3, LOW);    // turn the LED off by making the voltage LOW
delay(1000);                       // wait for a second

}

done!

What I learned this week¶

Individual and Group Assignment

Understand how information can be sent through an electronic board.
Using an oscilloscope allows you to feel that the microcontroller is working.
Combination of only 0 and 1 can be conveyed the imformation to MCU by electrically controlled potential differences.
The first thing to do after building a foundation is to write echo and blink of LED programme
Imagined how amazing it is that every electronic device in the world is controlled by a microcomputer.

file¶

Switch_LED.brd

Switch_LED.sch

Acknowledgement¶

Mr.Tamiya and Ms.Kamei as supportive instructors in Fablab Kannai

and You!

Last update: June 3, 2022