From 6c9726e01d71e2ef3c80177a4da3d82a1dcd2d85 Mon Sep 17 00:00:00 2001
From: Semaf Electronics <semaf@users.noreply.github.com>
Date: Sun, 24 Jun 2018 15:31:58 +0200
Subject: [PATCH] Create mfrc522_i2c.ino

---
 mfrc522_i2c.ino | 54 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 mfrc522_i2c.ino

diff --git a/mfrc522_i2c.ino b/mfrc522_i2c.ino
new file mode 100644
index 0000000..5bb4ee0
--- /dev/null
+++ b/mfrc522_i2c.ino
@@ -0,0 +1,54 @@
+#include <Wire.h>
+#include "MFRC522_I2C.h"
+
+#define RST_PIN 6 // Arduino UNO Pin
+// #define RST_PIN 14 // D5 Pin on NodeMCU
+
+
+// 0x28 is i2c address on SDA. Check your address with i2cscanner if not match.
+MFRC522 mfrc522(0x28, RST_PIN);   // Create MFRC522 instance.
+
+void setup() {
+  Serial.begin(115200);           // Initialize serial communications with the PC
+  Wire.begin();                   // Initialize I2C
+  mfrc522.PCD_Init();             // Init MFRC522
+  ShowReaderDetails();            // Show details of PCD - MFRC522 Card Reader details
+  Serial.println(F("Scan PICC to see UID, type, and data blocks..."));
+}
+
+void loop() {
+  // Look for new cards, and select one if present
+  if ( ! mfrc522.PICC_IsNewCardPresent() || ! mfrc522.PICC_ReadCardSerial() ) {
+    delay(50);
+    return;
+  }
+  
+  // Now a card is selected. The UID and SAK is in mfrc522.uid.
+  
+  // Dump UID
+  Serial.print(F("Card UID:"));
+  for (byte i = 0; i < mfrc522.uid.size; i++) {
+    Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
+    Serial.print(mfrc522.uid.uidByte[i], HEX);
+  } 
+  Serial.println();
+}
+
+void ShowReaderDetails() {
+  // Get the MFRC522 software version
+  byte v = mfrc522.PCD_ReadRegister(mfrc522.VersionReg);
+  Serial.print(F("MFRC522 Software Version: 0x"));
+  Serial.print(v, HEX);
+  if (v == 0x91)
+    Serial.print(F(" = v1.0"));
+  else if (v == 0x92)
+    Serial.print(F(" = v2.0"));
+  else
+    Serial.print(F(" (unknown)"));
+  Serial.println("");
+  // When 0x00 or 0xFF is returned, communication probably failed
+  if ((v == 0x00) || (v == 0xFF)) {
+    Serial.println(F("WARNING: Communication failure, is the MFRC522 properly connected?"));
+  }
+}
+