Hi to all I'm new to all this and so please forgive stupid questions.
I have a application to record time in and time out for emplyees. I have and rfid sd card to save data to and a rtc for time plus two buttons on IN one OUT.
I'm still working on the code but in general its working I can read the card data and time and save them to the SD. But because I do not know, for now, how to write a retrive data from the cards and calculate the time I am savng the time with a IN or OUT at the end and then do the math in excel.
My problem is I have three steps,
readRFID();
logCard();
verifyCheckIn();
verify check in i may take out seeing i do not know if someone is checking in or out. (that part was for cjheckin time)
So I thought about using a button one for In the other for Out.
This is where I am stuck after looking fo days I'm still not sure how to do it. In the code below once it ask for check in or out even if i press the button it does not continue the loop.
I still would like to and a display but still need to get this part to work frist.
I was thinking instaed of two function to add IN or OUT I could use a variable to reduce lines coding.
Thanks for any help.
#include <Adafruit_GFX.h>
#include <gfxfont.h>
#include <Adafruit_SSD1306.h>
#include <splash.h>
#include <MFRC522.h> // for the RFID
#include <SPI.h> // for the RFID and SD card module
#include <SD.h> // for the SD card
#include <RTClib.h> // for the RTC
#include <Wire.h>
// set button pin numbers:
const int buttonIN = A1; // the number of the pushbutton pin
const int buttonOUT = A2; // the number of the pushbutton pin
//variables will change
int buttonINState = 0;
int buttonOUTState = 0 ;
// define pins for RFID
#define CS_RFID 10
#define RST_RFID 9
// define select pin for SD card module
#define CS_SD 2
// Create a file to store the data
File myFile;
// Instance of the class for RFID
MFRC522 rfid(CS_RFID, RST_RFID);
// Instance of the class for RTC
RTC_DS3231 rtc;
// Define check in time
const int checkInHour = 9;
const int checkInMinute = 00;
// Variable to hold the tag's UID
String uidString;
//Variable to hold user check in
int userCheckInHour;
int userCheckInMinute;
// Pins for LEDs and buzzer
const int redLED = 6;
const int greenLED = 7;
const int buzzer = 3;
void setup() {
// initialize the pushbutton pin as an input:
pinMode(buttonIN, INPUT);
pinMode(buttonOUT, INPUT);
// Set LEDs and buzzer as outputs
pinMode(redLED, OUTPUT);
pinMode(greenLED, OUTPUT);
pinMode(buzzer, OUTPUT);
// Init Serial port
Serial.begin(9600);
while(!Serial);
// Init SPI bus
SPI.begin();
// Init MFRC522
rfid.PCD_Init();
// Setup for the SD card
Serial.print("Initializing SD card...");
if(!SD.begin(CS_SD)) {
Serial.println("initialization failed!");
return;
}
Serial.println("initialization done.");
// Setup for the RTC
if(!rtc.begin()) {
Serial.println("Couldn't find RTC");
while(1);
}
else {
// following line sets the RTC to the date & time this sketch was compiled
rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
}
}
void loop() {
//read the state of the buttons value:
buttonINState = digitalRead(buttonIN);
buttonOUTState = digitalRead(buttonOUT);
//look for new cards
if(rfid.PICC_IsNewCardPresent()) {
readRFID();
logCard();
verifyCheckIn();
}
delay(10);
}
void readRFID() {
rfid.PICC_ReadCardSerial();
Serial.println("Tag UID: ");
Serial.println("Premere bottone IN per ingresso");
Serial.println ("Premere bottono OUT per uscita");
//check if the button is pressed
while (digitalRead(buttonINState) == HIGH){}
if (buttonINState == LOW){
uidString = String(rfid.uid.uidByte[0]) + " " + String(rfid.uid.uidByte[1]) + " " +
String(rfid.uid.uidByte[2]) + " " + String(rfid.uid.uidByte[3]) + " IN";
Serial.println(uidString);
}
//check if the second button is pressed
else if (buttonOUTState == LOW){
uidString = String(rfid.uid.uidByte[0]) + " " + String(rfid.uid.uidByte[1]) + " " +
String(rfid.uid.uidByte[2]) + " " + String(rfid.uid.uidByte[3]) + " OUT";
Serial.println(uidString);
}
// Sound the buzzer when a card is read
tone(buzzer, 2000);
delay(100);
noTone(buzzer);
delay(100);
}
void logCard() {
// Enables SD card chip select pin
digitalWrite(CS_SD,LOW);
// Open file
myFile=SD.open("DATA.txt", FILE_WRITE);
// If the file opened ok, write to it
if (myFile) {
Serial.println("File opened ok");
myFile.print(uidString);
myFile.print(", ");
// Save time on SD card
DateTime now = rtc.now();
myFile.print(now.year(), DEC);
myFile.print('/');
myFile.print(now.month(), DEC);
myFile.print('/');
myFile.print(now.day(), DEC);
myFile.print(',');
myFile.print(now.hour(), DEC);
myFile.print(':');
myFile.println(now.minute(), DEC);
// Print time on Serial monitor
Serial.print(now.year(), DEC);
Serial.print('/');
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.print(now.day(), DEC);
Serial.print(' ');
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.println(now.minute(), DEC);
Serial.println("sucessfully written on SD card");
myFile.close();
// Save check in time;
userCheckInHour = now.hour();
userCheckInMinute = now.minute();
}
else {
Serial.println("error opening data.txt");
}
// Disables SD card chip select pin
digitalWrite(CS_SD,HIGH);
}
void verifyCheckIn(){
if((userCheckInHour < checkInHour)||((userCheckInHour==checkInHour) && (userCheckInMinute <= checkInMinute))){
digitalWrite(greenLED, HIGH);
delay(2000);
digitalWrite(greenLED,LOW);
Serial.println("You're welcome!");
}
else{
digitalWrite(redLED, HIGH);
delay(2000);
digitalWrite(redLED,LOW);
Serial.println("You are late...");
}
}
Ture