324 lines
7.7 KiB
C++
324 lines
7.7 KiB
C++
// Source : http://tronixstuff.com/2013/11/19/arduino-tutorials-chapter-15-rfid/
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// with just a mod to print the tag nb before "Accepted"/"Rejected"
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#include <SoftwareSerial.h>
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#include <Servo.h>
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#include <EEPROM.h>
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//Pin definitions
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#define RED_LED 12
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#define GREEN_LED 13
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#define RFID_RX 2
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#define RFID_TX 3
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#define PROG_BUTTON 4
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#define SERVO_CTRL 5
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// Others parameters
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#define SERVO_SPEED 2
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#define SERVO_PWR_TIME 500 //time to stop powering servomotor after the end of move
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#define DOOR_OPENED_TIME 3000
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#define EMPTY_TAG {0,0,0,0,0,0,0,0,0,0,0,0,0,0}
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#define UNWRITTEN_TAG {255,255,255,255,255,255,255,255,255,255,255,255,255,255}
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//Globals declarations
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SoftwareSerial RFID(RFID_RX, RFID_TX); // RX and TX
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Servo door_servo;
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int data1 = 0;
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int tag_ok = -1;
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byte servo_pos = 180;
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bool door_state = 0; // door opened ?
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bool door_move = false; // door moving ?
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long door_timer = 0; // timer to close the door
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long servo_timer = 0; //timer to stop powering servomotor
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long red_led_timer = 0;
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//byte tag1[14] = {2,52,54,48,48,57,49,48,57,56,48,53,69,3};
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byte newtag[14] = EMPTY_TAG; // used for read comparisons
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const byte emptytag[14] = EMPTY_TAG;
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const byte unwrittentag[14] = UNWRITTEN_TAG;
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byte * readeepromtag(short tagnb=0) {
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// Read the n-th RFID tag in EEPROM
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//First check if the # of tag is out of the capacity of EEPROM
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//Return an null tag if so.
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if ((tagnb+1)*14 > EEPROM.length()) {
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Serial.print(F("Error: Tag Nb to high : "));
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Serial.println(tagnb);
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byte tag[14] = EMPTY_TAG;
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return tag;
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}
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byte tag[14] = EMPTY_TAG;
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for (int i=0; i<14; i++)
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{
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tag[i]=EEPROM.read(i + tagnb*14);
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//delay(2); //small delay to avoid misreading
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}
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return tag;
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}
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int maxeepromtags() {
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// Return maximum number of tag that can be stored in EEPROM
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return EEPROM.length() / 14;
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}
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boolean comparetag(byte taga[14], byte tagb[14]) {
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// Compare two RFID tag
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int x = 0;
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for (int i = 0 ; i < 14 ; i++)
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{
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if (taga[i] == tagb[i]) x++;
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}
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return (x == 14);
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}
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int findtag(byte searchtag[14]) {
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//Find a given tag in EEPROM
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byte *tag;
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for (int i=0; i < maxeepromtags(); i++)
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{
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tag = readeepromtag(i);
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if (comparetag(tag, searchtag)) return i;
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}
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return -1;
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}
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void tagOK() {
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if (digitalRead(PROG_BUTTON))
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{
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for (int z = 0; z < 14 ; z++) Serial.print(newtag[z]);
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Serial.println(F(" : Accepted"));
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if (!door_state) {
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Serial.println("Ouverture...");
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door_state = 1;
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//door_timer = millis() + 1000;
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}
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}
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else
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{
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delTag(newtag);
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}
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}
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void tagNoOK() {
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if (digitalRead(PROG_BUTTON)) {
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for (int z = 0; z < 14 ; z++) Serial.print(newtag[z]);
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Serial.println(F(" : Rejected"));
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digitalWrite(RED_LED, HIGH);
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//Light the red LED for 1s
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red_led_timer = millis() + 1000;
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}
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else {
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addNewTag(newtag);
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}
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}
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void readRFID() {
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tag_ok = 0;
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delay(100); // time for the data to come in from the serial buffer.
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//Check up to 3 times if rejected to avoid mistake
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for (byte i=0; i<3; i++) {
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// read tag numbers
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for (byte z = 0 ; z < 14 ; z++) // read the rest of the tag
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{
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data1 = RFID.read();
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newtag[z] = data1;
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}
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RFID.flush(); // stops multiple reads
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// do the tag exist in EEPROM
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if (findtag(newtag) >= 0) tag_ok=1;
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if (tag_ok>0) break;
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}
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//Check if the tag is not an error before doing anything
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if (!comparetag(newtag, unwrittentag)) {
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// now do something based on tag type
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if (tag_ok > 0) tagOK();
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else tagNoOK();
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}
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// empty the data cache
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while (RFID.available()) {
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RFID.read();
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}
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}
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void disableServo() {
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//Disable servomotor once they stop moving
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if (!door_move and servo_timer < millis() and door_servo.attached()) {
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door_servo.detach();
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Serial.println(F("Servo disabled"));
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}
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}
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void updateDoor() {
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//Check if the need to move and move it
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//Apply door status
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if (door_state) {
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digitalWrite(GREEN_LED, HIGH);
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digitalWrite(RED_LED, LOW);
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if (servo_pos >= 180) {
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//if door has to be open and already open, disable servomotor
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disableServo();
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if (door_move) {
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Serial.println(F("Door : opened"));
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door_timer = millis() + DOOR_OPENED_TIME;
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servo_timer = millis() + SERVO_PWR_TIME;
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door_move = false;
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}
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}
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else {
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//Keep opening the door
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door_move = true;
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servo_pos += SERVO_SPEED;
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door_servo.attach(SERVO_CTRL);
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door_servo.write(servo_pos);
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Serial.print(F("Door : opening "));
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Serial.println(servo_pos);
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}
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//Check opened-door timer
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if (millis() < door_timer)
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{
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Serial.print(F("Door timer :"));
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Serial.println(door_timer - millis());
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}
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else if (!door_move)
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{
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door_state = 0;
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}
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}
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else {
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digitalWrite(GREEN_LED, LOW);
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if (servo_pos <= 0) {
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//if door has to be open and already open, disable servomotor
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disableServo();
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if (door_move) {
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Serial.println(F("Door : closed"));
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digitalWrite(RED_LED, LOW);
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servo_timer = millis() + SERVO_PWR_TIME;
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door_move = false;
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}
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}
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else {
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//Keep closing the door
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door_move = true;
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servo_pos -= SERVO_SPEED;
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door_servo.attach(SERVO_CTRL);
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door_servo.write(servo_pos);
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Serial.print(F("Door : closing "));
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Serial.println(servo_pos);
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}
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}
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}
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void updateRedLED() {
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//Check the redLED timer and turn ON or OFF the LED
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if (millis() < red_led_timer) {
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digitalWrite(RED_LED, HIGH);
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Serial.print(F("Red LED timer : "));
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Serial.println(red_led_timer - millis());
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}
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else digitalWrite(RED_LED, LOW);
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}
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void addNewTag(byte tag[14]) {
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Serial.print(F("Adding new tag to EEPROM : "));
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for (int z = 0; z < 14 ; z++) Serial.print(tag[z]);
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Serial.println("");
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//Find first empty or unwritten space in EEPROM
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int tagnb = findtag(emptytag);
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if (tagnb < 0){
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Serial.println(F("No empty space found."));
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tagnb = findtag(unwrittentag);
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if (tagnb < 0) {
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Serial.println(F("No unwritten space found either. Can't save more tag."));
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for (int i=0; i<4; i++) {
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digitalWrite(RED_LED, HIGH);
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delay(500);
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digitalWrite(RED_LED, LOW);
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delay(500);
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}
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return -1;
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}
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}
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Serial.print(F("New tag number : "));
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Serial.println(tagnb);
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Serial.print(F("Writing..."));
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for (int z = 0; z < 14 ; z++) EEPROM.write(z+tagnb, tag[z]);
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Serial.print(F(" Checking..."));
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byte tmptag[14];
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for (int z = 0; z < 14 ; z++) tmptag[z]=EEPROM.read(tag[z+tagnb]);
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if (comparetag(tmptag, tag)) Serial.println("OK");
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else Serial.println("Failed");
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}
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void delTag(byte tag[14]) {
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Serial.print(F("Deleting tag from EEPROM : "));
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for (int z = 0; z < 14 ; z++) Serial.print(tag[z]);
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Serial.println("");
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}
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void setup() {
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// start serial to PC
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Serial.begin(115200);
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// start serial to RFID reader
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RFID.begin(9600);
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// empty the data cache
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while (RFID.available()) {
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RFID.read();
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}
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// for status LEDs
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pinMode(GREEN_LED, OUTPUT);
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pinMode(RED_LED, OUTPUT);
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//Mode for button and end-stop
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pinMode(PROG_BUTTON, INPUT_PULLUP);
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Serial.print(F("EEPROM length : "));
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Serial.print(EEPROM.length());
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Serial.print(F(" bytes ("));
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Serial.print(maxeepromtags());
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Serial.println(F(" tags)"));
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Serial.println(findtag(newtag));
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Serial.println(findtag(unwrittentag));
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// for(byte n=0; n<maxeepromtags(); n++)
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// {
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// Serial.print(F("Tag n°"));
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// Serial.print(n);
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// Serial.print(": ");
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// byte *t;
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// t=readeepromtag(n);
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// for (int z = 0; z < 14 ; z++)
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// {
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// Serial.print(t[z]);
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// Serial.print(",");
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// }
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// Serial.println("");
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// }
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}
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void loop() {
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tag_ok = -1;
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if (RFID.available() > 0 and !door_state ) readRFID();
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updateDoor();
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updateRedLED();
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//delay(10);
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}
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