diff --git a/base_station/src/main.c b/base_station/src/main.c
index 927a652..ede4f6e 100644
--- a/base_station/src/main.c
+++ b/base_station/src/main.c
@@ -11,6 +11,8 @@
 #include "debug.h"
 #endif /* DEBUG */
 
+volatile uint8_t conn_lost;
+
 int main(void)
 {
     uint8_t *rx_raw;
@@ -34,6 +36,14 @@ int main(void)
     // will arrive
     /* SET(LED_PORT, LED_GREEN_BIT); */
 
+    // Set up TIMER1
+    TCNT1 = 0;
+    SET(TCCR1B, CS12); // Prescaler = 1024
+    SET(TIMSK1, TOIE1); // Enable overflow interrupts
+    ICR1 = 15625; // Interrupt after 0.25s
+
+    sei();
+
     while (1) {
         if (nrf24_dataReady()) {
             memset(rx_raw, 0, sizeof(data_packet_t));
@@ -49,14 +59,26 @@ int main(void)
                 SET(LED_PORT, LED_GREEN_BIT);
             else
                 CLR(LED_PORT, LED_GREEN_BIT);
-        } else {
-            CLR(LED_PORT, LED_GREEN_BIT);
-            CLR(LED_PORT, LED_BLUE_BIT);
+
+            conn_lost = 0;
         }
     }
 
+    cli();
+
     free(rx_data);
     free(rx_raw);
 
     return 0;
 }
+
+ISR(TIMER1_OVF_vect)
+{
+    // Node hasn't responded for a while, turn off all signal LEDs
+    if (conn_lost == 1) {
+        CLR(LED_PORT, LED_GREEN_BIT);
+        CLR(LED_PORT, LED_BLUE_BIT);
+    }
+
+    conn_lost = 1;
+}