I keep on getting this error message in my code and don't know how to fix it.
#include <SPI.h>
// Include Libraries
#include "Arduino.h"
#include "LiquidCrystal.h"
#include "RFID.h"
// Pin Definitions
#define LCD_PIN_RS 7
#define LCD_PIN_E 6
#define LCD_PIN_DB4 2
#define LCD_PIN_DB5 3
#define LCD_PIN_DB6 4
#define LCD_PIN_DB7 5
#define RFID_PIN_SDA 10
#define RFID_PIN_RST 8
// Global variables and defines
// object initialization
LiquidCrystal lcd(LCD_PIN_RS,LCD_PIN_E,LCD_PIN_DB4,LCD_PIN_DB5,LCD_PIN_DB6,LCD_PIN_DB7);
RFID rfid(RFID_PIN_SDA,RFID_PIN_RST);
// define vars for testing menu
const int timeout = 10000; //define timeout of 10 sec
char menuOption = 0;
long time0;
// Setup the essentials for your circuit to work. It runs first every time your circuit is powered with electricity.
void setup()
{
// Setup Serial which is useful for debugging
// Use the Serial Monitor to view printed messages
Serial.begin(9600);
while (!Serial) ; // wait for serial port to connect. Needed for native USB
Serial.println("start");
// set up the LCD's number of columns and rows
lcd.begin(16, 2);
//initialize RFID module
rfid.init();
menuOption = menu();
}
// Main logic of your circuit. It defines the interaction between the components you selected. After setup, it runs over and over again, in an eternal loop.
void loop()
{
if(menuOption == '1') {
// LCD 16x2 - Test Code
// Print a message to the LCD.
lcd.setCursor(0, 0);
lcd.print("Circuito Rocks !");
// Turn off the display:
lcd.noDisplay();
delay(500);
// Turn on the display:
lcd.display();
delay(500);
}
else if(menuOption == '2') {
// RFID - RC522 RF IC Card Sensor Module - Test Code
//Read RFID tag if present
String rfidtag = rfid.readTag();
//print the tag to serial monitor if one was discovered
rfid.printTag(rfidtag);
}
if (millis() - time0 > timeout)
{
menuOption = menu();
}
}
// Menu function for selecting the components to be tested
// Follow serial monitor for instrcutions
char menu()
{
Serial.println(F("\nWhich component would you like to test?"));
Serial.println(F("(1) LCD 16x2"));
Serial.println(F("(2) RFID - RC522 RF IC Card Sensor Module"));
Serial.println(F("(menu) send anything else or press on board reset button\n"));
while (!Serial.available());
// Read data from serial monitor if received
while (Serial.available())
{
char c = Serial.read();
if (isAlphaNumeric(c))
{
if(c == '1')
Serial.println(F("Now Testing LCD 16x2"));
else if(c == '2')
Serial.println(F("Now Testing RFID - RC522 RF IC Card Sensor Module"));
else
{
Serial.println(F("illegal input!"));
return 0;
}
time0 = millis();
return c;
}
}
}
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