Group Assignment
Etching VS Milling, Why the difference?
(Milling) : Because it is paper-based, it is soft enough for mechanical bits to carve away the copper without ruining the tools.
(Etching) : Because the fiberglass core is so abrasive, industrial manufacturers prefer using chemicals (acid) to "eat" the copper away rather than physically cutting it
Select SRM-20 mill > PCB
Upload SVG / Notice Invert effect (white is milled/black is kept..good for traces)
PCB Defaults (1/64 for tracess , 1/32 for edges)
Machine parameters. make sure its 0
Make sure this is on to get the file saved to your pc
Calculate
Preview
Pro Tip / Warning
In my toolpath generated, and as per my schematic in Week 6 I am not using the full multiplexer footprint to run this PCB, I only used 4 channels of the multiplexer and the rest i did not even solder completely to the PCB.
Always run DRC prior to exporting the files from KiCAD, mainly addressing any errors found
Double checking the constraints , clearance and minimum trace width
Pad properties to ensure layer / diamaeter
Plot Settings, Note:Use Drill/place file origin and Fit to page,change drill marks to Actual Size
Inkscape post-processing
Preview
Edge settings , notice no black is cutting, white is left space
Edge Preview
Setting and Defining Zero (xy)-Click on Set to Origin Point,repeat process for Z
Setting and Defining Zero (xy)-Confirm , repeat process for Z
Zeros Set
Load the program
While Cutting
game-test.ino
#include
#include
#include
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define SCREEN_ADDRESS 0x3C
// --- MUX CONTROL PINS ---
const int S0 = 0; const int S1 = 1; const int S2 = 2; const int S3 = 3;
const int SIG_PIN = 26; // MUX1 (A0)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
void setup() {
Wire.setSDA(6); Wire.setSCL(7); Wire.begin();
pinMode(S0, OUTPUT); pinMode(S1, OUTPUT);
pinMode(S2, OUTPUT); pinMode(S3, OUTPUT);
analogReadResolution(10); // Standard 10-bit range (0-1023)
if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) for(;;);
display.clearDisplay();
display.setTextColor(SSD1306_WHITE);
}
void loop() {
// Select J1 (Channel 0)
digitalWrite(S0, LOW); digitalWrite(S1, LOW);
digitalWrite(S2, LOW); digitalWrite(S3, LOW);
delay(10);
int raw = analogRead(SIG_PIN);
// Convert raw value to Voltage
// Formula: (Raw Value / 1023.0) * 3.3 Volts
float voltage = (raw / 1023.0) * 3.3;
display.clearDisplay();
// Header
display.setTextSize(1);
display.setCursor(0, 0);
display.println("VOLTMETER MODE (J1)");
display.println("---------------------");
// Display Voltage
display.setCursor(0, 25);
display.setTextSize(2);
display.print(voltage, 2); // Show 2 decimal places
display.println(" V");
// Display Raw for comparison
display.setTextSize(1);
display.setCursor(0, 50);
display.print("Raw ADC: ");
display.print(raw);
// Visual Level Bar
int barWidth = map(raw, 0, 1023, 0, 60);
display.drawRect(65, 50, 60, 8, SSD1306_WHITE);
display.fillRect(65, 50, barWidth, 8, SSD1306_WHITE);
display.display();
delay(100);
}
