Hey, I'm currently working on a project where I want to send data from Arduino to processing. Every time I place an rfid chip on the Arduino reader that switches the colors of a square in processing. So everytime I place a rfid-chip on my rfid-reader, arduino should send the data to processing, and depending on the card-number the color of the square in processing should change. The connection is somehow working but I the colors of the square in processing are not switching. I use the Arduino Elegoo Uno R3 and the joy-it RFID Reader. Would love to get some help, how to solve this problem! I attached a screenshot with the serial motor of the Arduino :) Here is my Arduino-Code:
1 | /*
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2 | * ----------------------------------------------------------------------
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3 | * Example program showing how to read new NUID from a PICC to serial.
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4 | * ----------------------------------------------------------------------
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5 | * https://circuits4you.com
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6 | *
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7 | * RC522 Interfacing with NodeMCU
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8 | *
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9 | Typical pin layout used:
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10 | * ---------------------------------------------------------------------
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11 | * MFRC522 Arduino Arduino Arduino Arduino Arduino
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12 | * Reader/PCD Uno/101 Mega Nano v3 Leonardo/Micro Pro Micro
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13 | * Signal Pin Pin Pin Pin Pin Pin
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14 | * ----------------------------------------------------------------------
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15 | * RST/Reset RST 9 5 D9 RESET/ICSP-5 RST
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16 | * SPI SS SDA(SS) 10 53 D10 10 10
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17 | * SPI MOSI MOSI 11 / ICSP-4 51 D11 ICSP-4 16
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18 | * SPI MISO MISO 12 / ICSP-1 50 D12 ICSP-1 14
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19 | * SPI SCK SCK 13 / ICSP-3 52 D13 ICSP-3 15
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20 | */
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21 | |
22 | #include <SPI.h> |
23 | #include <MFRC522.h> |
24 | |
25 | constexpr uint8_t RST_PIN = 9; // Configurable, see typical pin layout above |
26 | constexpr uint8_t SS_PIN = 10; // Configurable, see typical pin layout above |
27 | |
28 | MFRC522 rfid(SS_PIN, RST_PIN); // Instance of the class |
29 | |
30 | MFRC522::MIFARE_Key key; |
31 | |
32 | // Init array that will store new NUID
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33 | byte nuidPICC[4]; |
34 | |
35 | void setup() { |
36 | Serial.begin(9600); |
37 | delay(1000); |
38 | SPI.begin(); // Init SPI bus |
39 | rfid.PCD_Init(); // Init MFRC522 |
40 | |
41 | for (byte i = 0; i < 6; i++) { |
42 | key.keyByte[i] = 0xFF; |
43 | }
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44 | |
45 | Serial.println(F("This code scan the MIFARE Classsic NUID.")); |
46 | Serial.print(F("Using the following key:")); |
47 | printHex(key.keyByte, MFRC522::MF_KEY_SIZE); |
48 | }
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49 | |
50 | void loop() { |
51 | |
52 | // Look for new cards
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53 | if ( ! rfid.PICC_IsNewCardPresent()) |
54 | return; |
55 | |
56 | // Verify if the NUID has been readed
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57 | if ( ! rfid.PICC_ReadCardSerial()) |
58 | return; |
59 | |
60 | Serial.print(F("PICC type: ")); |
61 | MFRC522::PICC_Type piccType = rfid.PICC_GetType(rfid.uid.sak); |
62 | Serial.println(rfid.PICC_GetTypeName(piccType)); |
63 | |
64 | // Check is the PICC of Classic MIFARE type
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65 | if (piccType != MFRC522::PICC_TYPE_MIFARE_MINI && |
66 | piccType != MFRC522::PICC_TYPE_MIFARE_1K && |
67 | piccType != MFRC522::PICC_TYPE_MIFARE_4K) { |
68 | Serial.println(F("Your tag is not of type MIFARE Classic.")); |
69 | return; |
70 | }
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71 | |
72 | if (rfid.uid.uidByte[0] != nuidPICC[0] || |
73 | rfid.uid.uidByte[1] != nuidPICC[1] || |
74 | rfid.uid.uidByte[2] != nuidPICC[2] || |
75 | rfid.uid.uidByte[3] != nuidPICC[3] ) { |
76 | Serial.println(F("A new card has been detected.")); |
77 | |
78 | // Store NUID into nuidPICC array
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79 | for (byte i = 0; i < 4; i++) { |
80 | nuidPICC[i] = rfid.uid.uidByte[i]; |
81 | }
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82 | |
83 | /*Serial.println(F("The NUID tag is:"));
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84 | Serial.print(F("In hex: "));
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85 | printHex(rfid.uid.uidByte, rfid.uid.size);
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86 | Serial.println();
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87 | Serial.print(F("In dec: "));
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88 | printDec(rfid.uid.uidByte, rfid.uid.size);
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89 | Serial.println();
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90 | }
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91 | */
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92 | Serial.println(F("")); |
93 | //Serial.print(F(""));
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94 | printHex(rfid.uid.uidByte, rfid.uid.size); |
95 | Serial.println(); |
96 | |
97 | }
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98 | else Serial.println(F("Card read previously.")); |
99 | |
100 | // Halt PICC
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101 | rfid.PICC_HaltA(); |
102 | |
103 | // Stop encryption on PCD
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104 | rfid.PCD_StopCrypto1(); |
105 | }
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106 | |
107 | |
108 | /**
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109 | * Helper routine to dump a byte array as hex values to Serial.
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110 | */
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111 | void printHex(byte *buffer, byte bufferSize) { |
112 | for (byte i = 0; i < bufferSize; i++) { |
113 | Serial.print(buffer[i] < 0x10 ? " 0" : " "); |
114 | Serial.print(buffer[i], HEX); |
115 | |
116 | }
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117 | }
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118 | |
119 | /**
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120 | * Helper routine to dump a byte array as dec values to Serial.
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121 | */
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122 | void printDec(byte *buffer, byte bufferSize) { |
123 | for (byte i = 0; i < bufferSize; i++) { |
124 | Serial.print(buffer[i] < 0x10 ? " 0" : " "); |
125 | Serial.print(buffer[i], DEC); |
126 | |
127 | }
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128 | }
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Here is my Processing-Code:
1 | import processing.serial.*; |
2 | |
3 | Serial myPort; // The serial port |
4 | String finalRead = ""; // Variable with final data |
5 | String inputRead = ""; // Variable that recieves the data |
6 | int state = 0; // Variable to store the program state |
7 | |
8 | void setup() { |
9 | |
10 | size(800, 800); //Size of the program window |
11 | |
12 | |
13 | // List all the available serial ports
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14 | printArray(Serial.list()); |
15 | |
16 | // Open the port you are using at the rate you want:
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17 | myPort = new Serial(this, Serial.list()[4], 9600); |
18 | |
19 | // The rectangle will be placed based on it's own center
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20 | rectMode(CENTER); |
21 | |
22 | }
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23 | |
24 | void draw() { |
25 | //Background colour
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26 | background(50, 50, 150); |
27 | /*When the serial port is available the data from the RFID is
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28 | loaded into the finalRead variable.*/
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29 | |
30 | while (myPort.available() > 0) |
31 | {
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32 | //The c variable is updated with the read method
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33 | |
34 | char c=(char)myPort.read(); |
35 | |
36 | /*
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37 | When processing recieves data from Arduinos println command
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38 | it is recieved with a \r in the beginning
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39 | and a c\ in the end.
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40 | Therefore we add c to inputRead when
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41 | we are not encountering \r.
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42 | |
43 | If we encounter \n we know that the string is done reading.
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44 | The string is loaded into the finalRead variable and
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45 | the data is cleared from inputRead.
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46 | */
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47 | |
48 | if (c=='\n') |
49 | {
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50 | finalRead = inputRead; |
51 | inputRead = ""; |
52 | println("data: " + finalRead); |
53 | } else if (c!='\r') |
54 | {
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55 | inputRead+=c; |
56 | }
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57 | }
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58 | |
59 | /*Now the program checks if the data is equal to the data
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60 | on a wanted RFID-chip. If thats the case the state of the
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61 | program changes. Here you need to fill in data from a specific
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62 | RFID-chip*/
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63 | |
64 | if (finalRead.equals("D36BEF02")) { |
65 | state = 1; |
66 | }
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67 | |
68 | /*Another RFID-chip if-statement with another state. You can do this with as many RFID-chips you want.*/
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69 | |
70 | if (finalRead.equals("49 CD 4A A3")) { |
71 | state = 2; |
72 | }
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73 | |
74 | /*If the state is changed to 1, the colour of the center Rectangle
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75 | is changed to red.*/
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76 | |
77 | if (state == '1') { |
78 | background(#BC4A4A); |
79 | //fill(#ffffff);
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80 | }
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81 | |
82 | /*If the state is change to 2, the colour of the center Rectangle is changed to green.*/
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83 | if (state == '2') { |
84 | background(#BC4A4A); |
85 | //fill(#000000);
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86 | }
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87 | |
88 | /*The program now draws a rectangle with a fill colour dependent on the state variable*/
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89 | rect(width/2, height/2, width-100, height-100); |
90 | }
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