diff --git a/nac3artiq/demo.py b/nac3artiq/demo.py
index 993187b0..27b9d1e8 100644
--- a/nac3artiq/demo.py
+++ b/nac3artiq/demo.py
@@ -3,17 +3,21 @@ from min_artiq import *
 @kernel
 class Demo:
     core: Core
-    led: TTLOut
+    led0: TTLOut
+    led1: TTLOut
 
     def __init__(self):
         self.core = Core()
-        self.led = TTLOut(self.core, 19)
+        self.led0 = TTLOut(self.core, 18)
+        self.led1 = TTLOut(self.core, 19)
 
     @kernel
     def run_k(self):
         self.core.reset()
         while True:
-            self.led.pulse(100.*ms)
+            with parallel:
+                self.led0.pulse(100.*ms)
+                self.led1.pulse(100.*ms)
             self.core.delay(100.*ms)
 
     def run(self):