diff --git a/beautiful-racket/br/demo/hdl/HalfAdder.hdl.rkt b/beautiful-racket/br/demo/hdl/HalfAdder.hdl.rkt
new file mode 100644
index 0000000..349550d
--- /dev/null
+++ b/beautiful-racket/br/demo/hdl/HalfAdder.hdl.rkt
@@ -0,0 +1,11 @@
+#lang br/demo/hdl
+
+CHIP HalfAdder {
+    IN a, b;    // 1-bit inputs
+    OUT sum,    // Right bit of a + b 
+        carry;  // Left bit of a + b
+
+    PARTS:
+    Xor(a=a, b=b, out=sum);
+    And(a=a, b=b, out=carry);
+}