I have a program that checks to see if an RFID tag has been read, if it has, it runs some code.
I also have a count down timer function (timer) that I'd like to run in the background. It displays the clock on the bottom of the LCD.
The problem I'm having is that when I put timer(); in the main loop, the rest of the program is delayed for the duration of the count down which means that no RFID cards are read.
The timer works, but nothing below timer(); is running. I assume this is because of the use of delay.
Does anyone know how I can prevent this? Thank you.
#include <SPI.h>
#include <MFRC522.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
int readflag;
int initstate = 1;
int nextred = 4;
int nextblue = 8;
uint8_t readCard[4];
int minutes = 1; //start min
int seconds = 0; //start seconds
MFRC522 mfrc522(10, 9);
LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
///////////////////////////////////////// Setup ///////////////////////////////////
void setup() {
//Protocol Configuration
Serial.begin(9600);
SPI.begin();
mfrc522.PCD_Init();
mfrc522.PCD_SetAntennaGain(mfrc522.RxGain_max);
lcd.begin(20, 4);
}
///////////////////////////////////////////////////////////////////////////////
// Main loop
///////////////////////////////////////////////////////////////////////////////
void loop () {
do {
readflag = checkread();
if (initstate == 0) {
timer(); //start timer - timer works but nothing below timer(); is running.
lcd.setCursor(0,0);
lcd.print("Red team next: ");
lcd.print(nextred);
lcd.setCursor(0,1);
lcd.print("Blue team next: ");
lcd.print(nextblue);
}
}
while (!readflag);
tone(8, 850, 15);
recordid();
updatenextteamnumbers();
}
///////////////////////////////////////////////////////////////////////////////
// Function to update team next numbers
///////////////////////////////////////////////////////////////////////////////
void updatenextteamnumbers() {
//If Blue Tag scanned show team info
if (*((uint32_t *)readCard) == 0xACB7D573) {
Serial.println("Blue Tag detected, showing team info");
initstate=0;
}
//Red Team (sequence 4, 5, 2, 1, 9)
else if (*((uint32_t *)readCard) == 0x29FDC9F5 && initstate == 0) {
Serial.println("CARD 4 detected");
nextred = 5;
}
else if (*((uint32_t *)readCard) == 0x3FCE7832 && initstate == 0) {
Serial.println("CARD 5 detected");
nextred = 2;
}
else if (*((uint32_t *)readCard) == 0x3FCCECE2 && initstate == 0) {
Serial.println("CARD 2 detected");
nextred = 1;
}
else if (*((uint32_t *)readCard) == 0x3F7AB752 && initstate == 0) {
Serial.println("CARD 1 detected");
nextred = 9;
//activateredrelay
}
else if (*((uint32_t *)readCard) == 0x00000000 && initstate == 0) {
Serial.println("CARD 9 detected");
redwins();
}
//Blue Team (sequence 8, 6, 3, 7, 10)
else if (*((uint32_t *)readCard) == 0x00000000 && initstate == 0) {
Serial.println("CARD 8 detected");
nextblue = 6;
}
else if (*((uint32_t *)readCard) == 0x00000000 && initstate == 0) {
Serial.println("CARD 6 detected");
nextblue = 3;
}
else if (*((uint32_t *)readCard) == 0x3F7ABA82 && initstate == 0) {
Serial.println("CARD 3 detected");
nextblue = 7;
}
else if (*((uint32_t *)readCard) == 0x00000000 && initstate == 0) {
Serial.println("CARD 7 detected");
nextblue = 10;
//activatebluerelay
}
else if (*((uint32_t *)readCard) == 0x00000000 && initstate == 0) {
Serial.println("CARD 10 detected");
bluewins();
}
}
///////////////////////////////////////////////////////////////////////////////
// Stores the ID of the card that's been detected in readCard byte array
///////////////////////////////////////////////////////////////////////////////
void recordid() {
mfrc522.PICC_IsNewCardPresent();
mfrc522.PICC_ReadCardSerial();
for (int i = 0; i < mfrc522.uid.size; i++) {
readCard[i] = mfrc522.uid.uidByte[i];
Serial.print(mfrc522.uid.uidByte[i], HEX);
}
Serial.println("");
mfrc522.PICC_HaltA();
}
/////////////////////////////////////////////
// Returns 1 if a card has been detected
/////////////////////////////////////////////
int checkread() {
if ( ! mfrc522.PICC_IsNewCardPresent()) {
return 0; } //no card detected
mfrc522.PICC_HaltA();
return 1; } //card detected
/////////////////////////////////////////////
// Runs if red team wins
/////////////////////////////////////////////
void redwins() {
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Red team wins!");
lcd.display();
Serial.println("Red team wins!");
delay(36000);
}
/////////////////////////////////////////////
// Runs if blue team wins
/////////////////////////////////////////////
void bluewins() {
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Blue team wins!");
lcd.display();
Serial.println("Blue team wins!");
delay(36000);
}
/////////////////////////////////////////////
// Count down timer
/////////////////////////////////////////////
void timer() {
lcd.setCursor(0,3);
lcd.print("Time left:");
while (minutes > 0 || seconds >= 0) {
lcd.setCursor(15, 3);
(minutes < 10) ? lcd.print("0") : NULL;
lcd.print(minutes);
lcd.print(":");
(seconds < 10) ? lcd.print("0") : NULL;
lcd.print(seconds);
lcd.display();
decrement();
delay(1000);
}
}
/////////////////////////////////////////////
// Decrement timer
/////////////////////////////////////////////
void decrement() {
if (seconds > 0) {
seconds -= 1;
}
else {
if (minutes > 0) {
seconds = 59;
minutes -= 1;
}
else {
timeup();
}
}
}
/////////////////////////////////////////////
// Called when time expires
/////////////////////////////////////////////
void timeup() {
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Time up!");
lcd.display();
}