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Week 8 - Electronics production ​

Assignments ​

Group Assignment ​

  • Characterize the design rules for your in-house PCB production process
  • Submit a PCB design to a board house

Individual Assignment ​

  • Make and test a microcontroller development board that you designed
  • Extra credit: make it with another process

Group Working ​

My group work is attached here: https://fabacademy.org/2025/labs/unnc/assignments/week8/week08.html

Indiviual Working ​

This week, I will be machining circuit boards using the Roland MDX-40 that is a small desktop CNC machine.

Machining ​

Connect the computer to the Roland device and print the file

After processing:

Welding:

The development board will be tested in the next week's homework Input: https://fabacademy.org/2025/labs/unnc/students/xu-sun/assignments/week9/week09.html

To demonstrate that the board is functional, I uploaded a simple test program that controls the LEDs connected to pins D4 and D5 to blink. Additionally, a red LED is connected to the 3.3V power line to indicate whether the board is powered on.

Test code:

c++
const int led1 = D4; 
const int led2 = D5; 

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
}

void loop() {
  digitalWrite(led1, HIGH);
  digitalWrite(led2, LOW);
  delay(500);

  digitalWrite(led1, LOW);
  digitalWrite(led2, HIGH);
  delay(500);
}

Reference: ​

The reference and design files are listed below: