diff --git a/libs/core/test.ts b/libs/core/test.ts
index 448eefaf..e9b456e5 100644
--- a/libs/core/test.ts
+++ b/libs/core/test.ts
@@ -4,8 +4,11 @@ let plus = i + f
 let minus = i - f
 
 
-loops.forever(() => {
-    let r = Math.randomRange(0, 100)
-    serial.writeValue("R", r)
-    loops.pause(1000)
-})
+for (let i = 0; i < 3; ++i) {
+    loops.forever(() => {
+        let r = Math.randomRange(0, 100)
+        serial.writeValue("R", r)
+        loops.pause(1000)
+    })
+    loops.pause(300)
+}