diff --git a/firmware/firmware.ino b/firmware/firmware.ino
index e50cc71..7a1d820 100644
--- a/firmware/firmware.ino
+++ b/firmware/firmware.ino
@@ -37,12 +37,13 @@ typedef struct __attribute__((packed)) cardData {
 #define RELAY_OPEN !RELAY_CLOSED
 #define BUTTON_CLOSED LOW
 #define BUTTON_OPEN !BUTTON_CLOSED
-#define LED_ON HIGH
-#define LED_OFF !LED_ON
+#define LED_PIN_ON HIGH
+#define LED_PIN_OFF !LED_PIN_ON
 
 #define DELAY_TIME 10
 #define COMM_LOCK_IDLE_TIME 50
 #define COMM_CARD_IDLE_TIME 1000
+#define LED_DENIED_IDLE_TIME 30
 
 #define EEPROM_SIZE 4095
 #define EEPROM_START 0
@@ -54,6 +55,15 @@ enum wifiStates
 	WIFI_CONNECTED,
 } wifiState = WIFI_DISCONNECTED;
 
+enum LEDStates
+{
+	LED_OFF,
+	LED_ARMED,
+	LED_ON,
+	LED_DENIED,
+	LED_DENIED_IDLE,
+} LEDState = LED_OFF;
+
 enum lockStates
 {
 	LOCK_OFF,
@@ -91,6 +101,7 @@ void setup()
 void tickerLoop()
 {
 	processLockState();
+	processLEDState();
 
 	if (Serial.available() >= CARD_BUFFER_LENGTH) {
 		uint8_t bufPos = 0;
@@ -111,7 +122,7 @@ void tickerLoop()
 			cardBuffer[bufPos++] = readChar;
 
 			if (readChar == 0x3 && bufPos == CARD_BUFFER_LENGTH) {
-				if (lockState == LOCK_OFF) checkCard();
+				if (lockState == LOCK_OFF && LEDState == LED_OFF) checkCard();
 				break;
 			}
 		}
@@ -183,6 +194,7 @@ void checkCard()
 			}
 		} else {
 			if (LOGGING) Serial.println("[INFO] Card not authorized on machine.");
+			LEDState = LED_DENIED;
 		}
 	}
 }
@@ -230,11 +242,6 @@ void processWifiState()
 bool greenButton() { return digitalRead(GREEN_BUTTON_PIN) == BUTTON_CLOSED; }
 bool redButton() { return digitalRead(RED_BUTTON_PIN) == BUTTON_CLOSED; }
 
-void greenLEDOn() { digitalWrite(GREEN_LED_PIN, LED_ON); }
-void greenLEDOff() { digitalWrite(GREEN_LED_PIN, LED_OFF); }
-void redLEDOn() { digitalWrite(RED_LED_PIN, LED_ON); }
-void redLEDOff() { digitalWrite(RED_LED_PIN, LED_OFF); }
-
 void relayOn() { digitalWrite(RELAY_PIN, RELAY_CLOSED); }
 void relayOff() { digitalWrite(RELAY_PIN, RELAY_OPEN); }
 
@@ -242,8 +249,7 @@ void processLockState()
 {
 	switch (lockState) {
 		case LOCK_OFF:
-			greenLEDOff();
-			redLEDOff();
+			if (LEDState < LED_DENIED) LEDState = LED_OFF;
 
 			relayOff();
 			break;
@@ -256,8 +262,7 @@ void processLockState()
 			}
 			break;
 		case LOCK_ARMED:
-			greenLEDOn();
-			redLEDOff();
+			if (LEDState < LED_DENIED) LEDState = LED_ARMED;
 
 			relayOff();
 
@@ -279,8 +284,7 @@ void processLockState()
 			}
 			break;
 		case LOCK_ON:
-			greenLEDOff();
-			redLEDOn();
+			if (LEDState < LED_DENIED) LEDState = LED_ON;
 
 			relayOn();
 
@@ -296,6 +300,56 @@ void processLockState()
 	}
 }
 
+void greenLEDOn() { digitalWrite(GREEN_LED_PIN, LED_PIN_ON); }
+void greenLEDOff() { digitalWrite(GREEN_LED_PIN, LED_PIN_OFF); }
+void redLEDOn() { digitalWrite(RED_LED_PIN, LED_PIN_ON); }
+void redLEDOff() { digitalWrite(RED_LED_PIN, LED_PIN_OFF); }
+
+void processLEDState()
+{
+	static uint16_t LEDDeniedIdleCount = 0;
+
+	switch (LEDState) {
+		case LED_OFF:
+			greenLEDOff();
+			redLEDOff();
+
+			break;
+		case LED_ARMED:
+			greenLEDOn();
+			redLEDOff();
+
+			break;
+		case LED_ON:
+			greenLEDOff();
+			redLEDOn();
+
+			break;
+		case LED_DENIED:
+			LEDDeniedIdleCount = 0;
+
+			LEDState = LED_DENIED_IDLE;
+			break;
+		case LED_DENIED_IDLE:
+			LEDDeniedIdleCount++;
+
+			if (LEDDeniedIdleCount < LED_DENIED_IDLE_TIME) {
+				greenLEDOff();
+				redLEDOn();
+			} else if (LEDDeniedIdleCount < LED_DENIED_IDLE_TIME * 2) {
+				greenLEDOff();
+				redLEDOff();
+			} else {
+				LEDState = LED_OFF;
+			}
+			break;
+		default:
+			if (LOGGING) Serial.println("[ERROR] Invalid lock state.");
+			LEDState = LED_OFF;
+			break;
+	}
+}
+
 // JSON functions to prevent memory leaking
 String serializeLockJson(uint8_t lockState)
 {