From a7a36e7c48537eb11370ee62e6afec9346b0371d Mon Sep 17 00:00:00 2001
From: Dave <614881+sixhat@users.noreply.github.com>
Date: Wed, 5 Nov 2025 16:51:45 +0000
Subject: [PATCH] Refactor RFID code to add 0-padding to bytes when building
 tagID

---
 rfid/rfid.ino | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/rfid/rfid.ino b/rfid/rfid.ino
index 757b6aa..3f8536c 100644
--- a/rfid/rfid.ino
+++ b/rfid/rfid.ino
@@ -104,7 +104,13 @@ boolean getID()
   for ( uint8_t i = 0; i < 4; i++) {
   //readCard[i] = mfrc522.uid.uidByte[i];
   // Adds the 4 bytes in a single String variable
-  tagID.concat(String(mfrc522.uid.uidByte[i], HEX));
+  uint8_t value = mfrc522.uid.uidByte[i];
+  // Checks to see if the value is smaller 
+  // than 16 (0x10) and adds the 0 padding needed if needed
+  if (value<0x10) {
+    tagID.concat("0");  
+  }
+  tagID.concat(String(value, HEX));
   }
   //MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
   tagID.toUpperCase();
@@ -112,3 +118,4 @@ boolean getID()
   return true;
   //MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
 }
+