Copy and paste the code below into the Arduino IDE. Then, compile and upload it to your metro.
/*
* (PROJ03) Metro (and Metro Express) Persistence of Vision Display
* Desc: POV display for Metro & Metro Express using 7x LEDs and 7x 560ohm Resistors
*
* by Brent Rubell for Adafruit Industries. Support Open Source, buy Adafruit!
*/
int spacer[8][5] = {
{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0}
};
int A[8][5] = {
{0, 1, 1, 1, 0},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 1, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{0, 0, 0, 0, 0}
};
int B[8][5] = {
{1, 1, 1, 1, 0},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 1, 1, 0},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 1, 1, 0},
{0, 0, 0, 0, 0}
};
int C[8][5] = {
{0, 1, 1, 1, 0},
{1, 1, 0, 1, 1},
{1, 1, 0, 0, 0},
{1, 1, 0, 0, 0},
{1, 1, 0, 0, 0},
{1, 1, 0, 1, 1},
{0, 1, 1, 1, 0},
{0, 0, 0, 0, 0}
};
int D[8][5] = {
{1, 1, 1, 0, 0},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 1, 1, 0},
{0, 0, 0, 0, 0}
};
int E[8][5] = {
{1, 1, 1, 1, 1},
{1, 1, 0, 0, 0},
{1, 1, 0, 0, 0},
{1, 1, 1, 1, 0},
{1, 1, 0, 0, 0},
{1, 1, 0, 0, 0},
{1, 1, 1, 1, 1},
{0, 0, 0, 0, 0}
};
int F[8][5] = {
{1, 1, 1, 1, 1},
{1, 1, 0, 0, 0},
{1, 1, 0, 0, 0},
{1, 1, 1, 1, 0},
{1, 1, 0, 0, 0},
{1, 1, 0, 0, 0},
{1, 1, 0, 0, 0},
{0, 0, 0, 0, 0}
};
int G[8][5] = {
{0, 1, 1, 1, 0},
{1, 1, 0, 1, 1},
{1, 1, 0, 0, 0},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 0, 0, 1},
{0, 1, 1, 1, 1},
{0, 0, 0, 0, 0}
};
int H[8][5] = {
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 1, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{1, 1, 0, 1, 1},
{0, 0, 0, 0, 0}
};
int I[8][5] = {
{0, 0, 0, 0, 0},
{1, 1, 1, 1, 1},
{0, 0, 1, 0, 0},
{0, 0, 1, 0, 0},
{0, 0, 1, 0, 0},
{0, 0, 1, 0, 0},
{1, 1, 1, 1, 1},
{0, 0, 0, 0, 0}
};
int J[8][5] = {
{0, 0, 0, 1, 1},
{0, 0, 0, 1, 1},
{0, 0, 0, 1, 1},
{0, 0, 0, 1, 1},
{1, 0, 0, 1, 1},
{1, 0, 0, 1, 1},
{0, 1, 1, 0, 0},
{0, 0, 0, 0, 0}
};
int K[8][5] = {
{0, 0, 0, 0, 0},
{1, 0, 0, 1, 0},
{1, 0, 1, 0, 0},
{1, 1, 0, 0, 0},
{1, 1, 0, 0, 0},
{1, 0, 1, 0, 0},
{1, 0, 0, 1, 0},
{0, 0, 0, 0, 0}
};
int L[8][5] = {
{1, 1, 0, 0, 0},
{1, 1, 0, 0, 0},
{1, 1, 0, 0, 0},
{1, 1, 0, 0, 0},
{1, 1, 0, 0, 0},
{1, 1, 1, 1, 1},
{1, 1, 1, 1, 1},
{0, 0, 0, 0, 0}
};
int M[8][5] = {
{1, 0, 0, 0, 1},
{1, 1, 0, 1, 1},
{1, 0, 1, 0, 1},
{1, 0, 1, 0, 1},
{1, 0, 1, 0, 1},
{1, 0, 1, 0, 1},
{1, 0, 1, 0, 1},
{0, 0, 0, 0, 0}
};
int N[8][5] = {
{1, 0, 0, 0, 1},
{1, 1, 0, 0, 1},
{1, 0, 1, 0, 1},
{1, 0, 0, 1, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{0, 0, 0, 0, 0}
};
int O[8][5] = {
{1, 1, 1, 1, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 1, 1, 1, 1},
{0, 0, 0, 0, 0}
};
int P[8][5] = {
{1, 1, 1, 1, 0},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 1, 1, 1, 0},
{1, 0, 0, 0, 0},
{1, 0, 0, 0, 0},
{1, 0, 0, 0, 0},
{0, 0, 0, 0, 0}
};
int Q[8][5] = {
{0, 1, 1, 1, 0},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 1, 0, 1},
{1, 0, 0, 1, 0},
{0, 1, 1, 0, 1},
{0, 0, 0, 0, 0}
};
int R[8][5] = {
{1, 1, 1, 1, 0},
{1, 0, 0, 1, 0},
{1, 0, 0, 1, 0},
{1, 1, 1, 1, 0},
{1, 1, 0, 0, 0},
{1, 0, 1, 0, 0},
{1, 0, 0, 1, 0},
{0, 0, 0, 0, 0}
};
int S[8][5] = {
{0, 1, 1, 1, 1},
{0, 1, 0, 0, 1},
{0, 1, 0, 0, 0},
{0, 0, 1, 0, 0},
{0, 0, 0, 1, 0},
{1, 0, 0, 1, 0},
{1, 1, 1, 1, 0},
{0, 0, 0, 0, 0}
};
int T[8][5] = {
{1, 1, 1, 1, 1},
{1, 0, 1, 0, 1},
{1, 0, 1, 0, 1},
{0, 0, 1, 0, 0},
{0, 0, 1, 0, 0},
{0, 0, 1, 0, 0},
{0, 0, 1, 0, 0},
{0, 0, 0, 0, 0}
};
int U[8][5] = {
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 1, 1, 1, 1},
{0, 0, 0, 0, 0}
};
int V[8][5] = {
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{0, 1, 0, 1, 0},
{0, 0, 1, 0, 0},
{0, 0, 0, 0, 0}
};
int W[8][5] = {
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 0, 0, 1},
{1, 0, 1, 0, 1},
{1, 0, 1, 0, 1},
{1, 1, 1, 1, 1},
{0, 0, 0, 0, 0}
};
int X[8][5] = {
{1, 0, 0, 0, 1},
{0, 1, 0, 1, 0},
{0, 0, 1, 0, 0},
{0, 0, 1, 0, 0},
{0, 1, 0, 1, 0},
{1, 0, 0, 0, 1},
{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0}
};
int Y[8][5] = {
{0, 0, 0, 0, 0},
{0, 0, 0, 0, 0},
{0, 1, 0, 1, 0},
{0, 1, 0, 1, 0},
{0, 1, 1, 1, 0},
{0, 0, 1, 0, 0},
{0, 0, 1, 0, 0},
{0, 0, 0, 0, 0}
};
int Z[8][5] = {
{0, 0, 0, 0, 0},
{1, 1, 1, 1, 1},
{0, 0, 0, 1, 1},
{0, 0, 1, 1, 0},
{0, 1, 1, 0, 0},
{1, 1, 0, 0, 0},
{1, 1, 1, 1, 1},
{0, 0, 0, 0, 0}
};
// LED pins
int LEDPins[] = {2, 3, 4, 5, 6, 7, 8, 9};
// space between the letters
float letterSpacing = 0.5;
void setup() {
// start serialmon.
Serial.begin(9600);
// set all leds to output mode
for (int pin = 0; pin < 8; pin++) {
pinMode(LEDPins[pin], OUTPUT);
}
}
void loop() {
printLetter(M);
printLetter(spacer);
printLetter(E);
printLetter(spacer);
printLetter(T);
printLetter(spacer);
printLetter(R);
printLetter(spacer);
printLetter(O);
printLetter(spacer);
// delay 2s
delay(2);
}
// outputs a letter to the POV Display
void printLetter(int letter[8][5]) {
// row of letter array
for (int j = 0; j < 5; j++)
{
Serial.print("\nRow # ");
Serial.print(j);
Serial.println(".");
// column of letter array
for (int i = 0; i < 8; i++) {
// check for 1 within column6
if (letter[i][j] == 1) {
Serial.println("1 detected");
digitalWrite(LEDPins[i], HIGH);
}
else {
Serial.println("0 detected");
digitalWrite(LEDPins[i], LOW);
}
}
delay(letterSpacing);
}
}
I can't get a good photograph of the MetroPOV in action
Try checking the next section of this guide. We suggest some techniques, and even an app.
I don't see the LEDs lighting up in different patterns
Check your wiring, the led's are connected to pins 2, 3, 4, 5, 6, 7, 8, and 9 on the Metro or Metro Express
Nothing's working, I'm getting nowhere
Page last edited January 22, 2025
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