diff --git a/nrf5/modules/test.py b/nrf5/modules/test.py
new file mode 100644
index 0000000000..db1af5af88
--- /dev/null
+++ b/nrf5/modules/test.py
@@ -0,0 +1,10 @@
+import time
+from machine import PWM
+
+def pulse():
+    for i in range(0, 101):
+        p = PWM(0, pin=17, freq=50, duty=i, period=16000)
+        time.sleep_ms(10)
+    for i in range(0, 101):
+        p = PWM(0, pin=17, freq=50, duty=100-i, period=16000)
+        time.sleep_ms(10)