Replaced old RFID reader with PN532 that supports I2C

platformio.ini

@@ -14,5 +14,5 @@ board = d1
 framework = arduino
 lib_deps = 
 	adafruit/Adafruit SSD1306@^2.5.9
-	miguelbalboa/MFRC522@^1.4.11
 	arduino-libraries/Arduino_JSON@^0.2.0
+	adafruit/Adafruit PN532@^1.3.3

src/SmartRFID.cpp

@@ -0,0 +1,60 @@
+#include "SmartRFID.hpp"
+
+SmartRFID::SmartRFID(Adafruit_PN532 *nfc)
+{
+    m_nfc = nfc; // RFID with I2C
+}
+
+void SmartRFID::init()
+{
+    m_nfc->begin();
+    unsigned long versiondata = m_nfc->getFirmwareVersion();
+    if (!versiondata)
+    {
+        Serial.print("No board found!");
+        while (1)
+            ;
+    }
+    Serial.println("PN5 chip found!");
+}
+
+String SmartRFID::readTag()
+{
+    m_nfc->SAMConfig();
+    Serial.println("Waiting for ISO14443A chip...");
+
+    uint8_t success;
+    uint8_t uid[] = {0, 0, 0, 0, 0, 0, 0}; // buffer for UID
+    uint8_t uidLength;                     // UID length (4 or 7 bytes depending on ISO14443A Card/Chip type)
+    success = m_nfc->readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);
+    if (success)
+    {
+        Serial.println("Found an ISO14443A card");
+        Serial.print("  UID Length: ");
+        Serial.print(uidLength, DEC);
+        Serial.println(" bytes");
+        Serial.print("  UID Value: ");
+        m_nfc->PrintHex(uid, uidLength);
+        Serial.println("");
+        Serial.print("  compact hex code: ");
+        String s = string_dump_byte_array(uid, uidLength);
+        Serial.println(s);
+        return s;
+    }
+    return "error_reading_tag";
+}
+
+/**
+ * Helper routine to dump a byte array as hex values to a string.
+ */
+String SmartRFID::string_dump_byte_array(byte *buffer, byte bufferSize)
+{
+    String result = "";
+    for (byte i = 0; i < bufferSize; i++)
+    {
+        result += (buffer[i] < 0x10 ? " 0" : " ");
+        result += String(buffer[i], HEX);
+    }
+    result.replace(" ", "");
+    return result;
+}

src/SmartRFID.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <Adafruit_PN532.h>
+
+class SmartRFID
+{
+
+public:
+    SmartRFID(Adafruit_PN532 *nfc);
+    void init();
+    String readTag();
+
+private:
+    String string_dump_byte_array(byte *buffer, byte bufferSize);
+
+private:
+    unsigned long m_cardid;
+    Adafruit_PN532 *m_nfc;
+
+};

src/main.cpp

@@ -3,21 +3,27 @@
 
 #define WIRE Wire
 
-#define DISPLAY_PIN 4        // D2 (SDA)
-#define SERVO_PIN 0          // D3
-#define TOUCH_BTN_PIN 16     // D0
+#define SERVO_PIN 14         // D5
 #define POTENTIOMETER_PIN A0 // A0
 
-// RFID
-#define RST_PIN 2                 // D4
-#define SS_PIN 15                 // D8
-MFRC522 mfrc522(SS_PIN, RST_PIN); // create RFID instance
-MFRC522::MIFARE_Key key;
+// buttons
+#define TACTILE_BTN_LEFT 0  // D3
+#define TACTILE_BTN_RIGHT 2 // D4
+#define TOUCH_BTN_PIN 16    // D0
 
+// RFID
+#define PN532_IRQ 13                        // D7
+#define PN532_RESET 12                      // D6 (not connected)
+Adafruit_PN532 nfc(PN532_IRQ, PN532_RESET); // RFID with I2C
+
+// OLED display
+#define DISPLAY_PIN 4 // D2 (SDA)
 auto display = Adafruit_SSD1306(128, 32, &WIRE);
 
+// util classes
 ContinuousServo contServo(SERVO_PIN);
 TeaTimer teaTimer(&contServo);
+SmartRFID smartRFID(&nfc);
 SmartDial smartDial(POTENTIOMETER_PIN);
 SmartDisplay smartDisplay(&display);
 TeaNetworking teaNet;
@@ -25,7 +31,7 @@ TeaNetworking teaNet;
 // networking
 String shuttleServer = "https://ias-tea-axum.shuttleapp.rs";
 
-TeaData currentTea;
+TeaData currentTea("Teafault", "c0derfid", 100, 30);
 
 enum State
 {
@@ -43,12 +49,7 @@ void setup()
 
   teaNet.init(ssid, password);
 
-  Serial.println("Initializing SPI...");
-  SPI.begin();
-
-  Serial.println("Initializing RFID...");
-  mfrc522.PCD_Init();
-  mfrc522.PICC_HaltA();
+  smartRFID.init();
 
   Serial.println("Initializing OLED...");
   display.begin(SSD1306_SWITCHCAPVCC, 0x3C, false); // Address 0x3C for 128x32
@@ -56,14 +57,11 @@ void setup()
 
   delay(1000);
 
-  // Prepare the key (used both as key A and key B)
-  for (byte i = 0; i < 6; i++)
-  {
-    key.keyByte[i] = 0xFF;
-  }
-
   pinMode(LED_BUILTIN, OUTPUT);
   pinMode(TOUCH_BTN_PIN, INPUT);
+
+  pinMode(TACTILE_BTN_LEFT, INPUT);
+  pinMode(TACTILE_BTN_RIGHT, INPUT);
 }
 
 int steepingSeconds = 60;
@@ -95,33 +93,16 @@ void loop()
   case WAIT_FOR_RFID_SCAN:
   {
     smartDisplay.printWaitForRFIDScreen();
-    // Look for new cards
-    if (!mfrc522.PICC_IsNewCardPresent())
-      return;
 
-    // Select one of the cards
-    if (!mfrc522.PICC_ReadCardSerial())
-      return;
+    String uid = smartRFID.readTag();
 
-    // UID is a unique four hex pairs, e.g. E6 67 2A 12
-    Serial.print("Card UID:");
-    oled_dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
-    serial_dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
-    display.println();
+    display.println(uid);
     display.display();
     delay(1000);
 
-    Serial.println();
-    Serial.print("String UID:");
-    String uid = string_dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
-    Serial.println(uid);
-
-    // Halt PICC
-    mfrc522.PICC_HaltA();
-
     display.println("Success!");
     display.display();
-    delay(1000);
+    delay(500);
 
     JSONVar result = teaNet.httpsGETRequest(shuttleServer + "/teabyrfid/" + uid);
     Serial.print("Result:");
@@ -138,12 +119,25 @@ void loop()
     currentTea = TeaData(result["teaname"], result["rfidcode"], result["watertemp"], result["steepingSeconds"]);
 
     state = State::DISPLAY_SCANNED_TEA_CONFIG;
+
     break;
   }
   case DISPLAY_SCANNED_TEA_CONFIG:
   {
     int dir = smartDial.smoothEdit(&currentTea.m_steepingSeconds, 0, 6000);
+
+    if (digitalRead(TACTILE_BTN_LEFT) == LOW)
+    {
+      printMsg("BUTTON GREEN");
+    }
+    else if (digitalRead(TACTILE_BTN_RIGHT) == LOW)
+    {
+      printMsg("BUTTON RED");
+    }
+    else
+    {
       smartDisplay.printTeaConfigScreen(currentTea.m_teaName, currentTea.m_steepingSeconds, dir);
+    }
 
     // change state if start pressed
     if (isBtnPressed())
@@ -189,43 +183,6 @@ bool isBtnPressed()
   return digitalRead(TOUCH_BTN_PIN) == HIGH;
 }
 
-/**
- * Helper routine to dump a byte array as hex values to a string.
- */
-String string_dump_byte_array(byte *buffer, byte bufferSize)
-{
-  String result = "";
-  for (byte i = 0; i < bufferSize; i++)
-  {
-    result += (buffer[i] < 0x10 ? " 0" : " ");
-    result += String(buffer[i], HEX);
-  }
-  result.replace(" ", "");
-  return result;
-}
-/**
- * Helper routine to dump a byte array as hex values to Serial.
- */
-void serial_dump_byte_array(byte *buffer, byte bufferSize)
-{
-  for (byte i = 0; i < bufferSize; i++)
-  {
-    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
-    Serial.print(buffer[i], HEX);
-  }
-}
-/**
- * Helper routine to dump a byte array as hex values to OLED.
- */
-void oled_dump_byte_array(byte *buffer, byte bufferSize)
-{
-  for (byte i = 0; i < bufferSize; i++)
-  {
-    display.print(buffer[i] < 0x10 ? " 0" : " ");
-    display.print(buffer[i], HEX);
-  }
-}
-
 void printMsg(const String &s)
 {
   display.clearDisplay();

src/main.hpp

@@ -1,15 +1,16 @@
 #include <Arduino.h>
 #include <Arduino_JSON.h>
-#include <SPI.h>
 #include <Wire.h>
 #include <Adafruit_GFX.h>
 #include <Adafruit_SSD1306.h>
-#include <MFRC522.h>
+#include <Adafruit_PN532.h>
+
 #include <FS.h>
 #include <LittleFS.h>
 #include <time.h>
 
 #include "TeaTimer.hpp"
+#include "SmartRFID.hpp"
 #include "ContinuousServo.hpp"
 #include "SmartDial.hpp"
 #include "SmartDisplay.hpp"
@@ -20,7 +21,3 @@ bool toggle_led(void *);
 void printMsg(const String &s);
 void printMsg(unsigned long l);
 bool isBtnPressed();
-
-void serial_dump_byte_array(byte *buffer, byte bufferSize);
-void oled_dump_byte_array(byte *buffer, byte bufferSize);
-String string_dump_byte_array(byte *buffer, byte bufferSize);