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arduino-cli/libraries/MD_Parola/examples/Parola_Ambulance/Parola_Ambulance.ino

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+// Demonstrates revresed text (as if on front of an ambulance)
+//
+// NOTE: MD_MAX72xx library must be installed and configured for the LED
+// matrix type being used. Refer documentation included in the MD_MAX72xx
+// library or see this link:
+// https://majicdesigns.github.io/MD_MAX72XX/page_hardware.html
+//
+#include <MD_Parola.h>
+#include <MD_MAX72xx.h>
+#include <SPI.h>
+
+// Define the number of devices we have in the chain and the hardware interface
+// NOTE: These pin numbers will probably not work with your hardware and may
+// need to be adapted
+#define MAX_DEVICES 8
+
+#define PAUSE_TIME    1000
+#define SCROLL_SPEED  50
+
+#define CLK_PIN   13
+#define DATA_PIN  11
+#define CS_PIN    10
+
+// HARDWARE SPI
+MD_Parola P = MD_Parola(CS_PIN, MAX_DEVICES);
+// SOFTWARE SPI
+//MD_Parola P = MD_Parola(DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);
+
+char *msg[] =
+{
+  "Ambulance",
+  "Emergency",
+};
+
+void setup(void)
+{
+  // initialise the LED display
+  P.begin();
+  P.setZoneEffect(0, true, PA_FLIP_LR);
+}
+
+void loop(void)
+{
+  static uint8_t cycle = 0;
+
+  if (P.displayAnimate())
+  {
+    // set up the string
+    P.displayText(msg[cycle], PA_CENTER, SCROLL_SPEED, PAUSE_TIME, PA_PRINT, PA_NO_EFFECT);
+
+    // prepare for next pass
+    cycle = (cycle + 1) % ARRAY_SIZE(msg);
+  }
+}