Scrolling LED Matrix Display with Arduino

# Wokwi Library List
# See https://docs.wokwi.com/guides/libraries
# Automatically added based on includes:
MD_Parola

#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
// set to 1 if we are implementing the user interface pot, switch, etc
define USE_UI_CONTROL 0
if USE_UI_CONTROL
include
endif
// Turn on debug statements to the serial output
define DEBUG 0
if DEBUG
define PRINT(s, x) { Serial.print(F(s)); Serial.print(x); }
define PRINTS(x) Serial.print(F(x))
define PRINTX(x) Serial.println(x, HEX)
else
define PRINT(s, x)
define PRINTS(x)
define PRINTX(x)
endif
// 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 HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
define MAX_DEVICES 11
define CLK_PIN 13
define DATA_PIN 11
define CS_PIN 10
// HARDWARE SPI
MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
// SOFTWARE SPI
//MD_Parola P = MD_Parola(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);
// Scrolling parameters
if USE_UI_CONTROL
const uint8_t SPEED_IN = A5;
const uint8_t DIRECTION_SET = 8; // change the effect
const uint8_t INVERT_SET = 9; // change the invert
const uint8_t SPEED_DEADBAND = 5;
endif // USE_UI_CONTROL
uint8_t scrollSpeed = 30; // default frame delay value
textEffect_t scrollEffect = PA_SCROLL_LEFT;
textPosition_t scrollAlign = PA_LEFT;
uint16_t scrollPause = 0; // in milliseconds
// Global message buffers shared by Serial and Scrolling functions
define BUF_SIZE 75
char curMessage[BUF_SIZE] = { "" };
char newMessage[BUF_SIZE] = { "Tinkercircuits.com" };
bool newMessageAvailable = true;
if USE_UI_CONTROL
MD_UISwitch_Digital uiDirection(DIRECTION_SET);
MD_UISwitch_Digital uiInvert(INVERT_SET);
void doUI(void)
{
// set the speed if it has changed
{
int16_t speed = map(analogRead(SPEED_IN), 0, 1023, 10, 150);
if ((speed >= ((int16_t)P.getSpeed() + SPEED_DEADBAND)) || (speed <= ((int16_t)P.getSpeed() - SPEED_DEADBAND))) { P.setSpeed(speed); scrollSpeed = speed; PRINT("\nChanged speed to ", P.getSpeed()); }
}
if (uiDirection.read() == MD_UISwitch::KEY_PRESS) // SCROLL DIRECTION
{
PRINTS("\nChanging scroll direction");
scrollEffect = (scrollEffect == PA_SCROLL_LEFT ? PA_SCROLL_RIGHT : PA_SCROLL_LEFT);
P.setTextEffect(scrollEffect, scrollEffect);
P.displayClear();
P.displayReset();
}
if (uiInvert.read() == MD_UISwitch::KEY_PRESS) // INVERT MODE
{
PRINTS("\nChanging invert mode");
P.setInvert(!P.getInvert());
}
}
endif // USE_UI_CONTROL
void readSerial(void)
{
static char *cp = newMessage;
while (Serial.available())
{
cp = (char)Serial.read(); if ((cp == '\n') || (cp - newMessage >= BUF_SIZE-2))
{
*cp = '\0'; // end the string
cp = newMessage;
newMessageAvailable = true;
}
else
cp++;
}
}
void setup()
{
Serial.begin(57600);
Serial.print("\n[Parola Scrolling Display]\nType a message for the scrolling display\nEnd message line with a newline");
if USE_UI_CONTROL
uiDirection.begin();
uiInvert.begin();
pinMode(SPEED_IN, INPUT);
doUI();
endif // USE_UI_CONTROL
P.begin();
P.displayText(curMessage, scrollAlign, scrollSpeed, scrollPause, scrollEffect, scrollEffect);
}
void loop()
{
if USE_UI_CONTROL
doUI();
endif // USE_UI_CONTROL
if (P.displayAnimate())
{
if (newMessageAvailable)
{
strcpy(curMessage, newMessage);
newMessageAvailable = false;
}
P.displayReset();
}
readSerial();
}