diff --git a/artiq/examples/master/repository/code_applet.py b/artiq/examples/master/repository/code_applet.py
new file mode 100644
index 000000000..a1e5f2f56
--- /dev/null
+++ b/artiq/examples/master/repository/code_applet.py
@@ -0,0 +1,29 @@
+import os
+import time
+
+from artiq.experiment import *
+
+
+# Do the applet source code path determination on import.
+# ARTIQ imports the experiment, then changes the current
+# directory to the results, then instantiates the experiment.
+# In Python __file__ is a relative path which is not updated
+# when the current directory is changed.
+custom_applet = os.path.abspath(os.path.join(os.path.dirname(__file__),
+                                             "custom_applet.py"))
+
+
+class CreateCodeApplet(EnvExperiment):
+    def build(self):
+        self.setattr_device("ccb")
+
+    def run(self):
+        with open(custom_applet) as f:
+            self.ccb.issue("create_applet", "code_applet_example",
+               "code_applet_dataset", code=f.read(), group="autoapplet")
+            for i in reversed(range(10)):
+                self.set_dataset("code_applet_dataset", i,
+                                 broadcast=True, save=False)
+                time.sleep(1)
+            self.ccb.issue("disable_applet", "code_applet_example",
+                           group="autoapplet")
diff --git a/artiq/examples/master/repository/custom_applet.py b/artiq/examples/master/repository/custom_applet.py
new file mode 100644
index 000000000..1f197ffbb
--- /dev/null
+++ b/artiq/examples/master/repository/custom_applet.py
@@ -0,0 +1,26 @@
+from PyQt5 import QtWidgets
+
+from artiq.applets.simple import SimpleApplet
+
+
+class DemoWidget(QtWidgets.QLabel):
+    def __init__(self, args):
+        QtWidgets.QLabel.__init__(self)
+        self.dataset_name = args.dataset
+
+    def data_changed(self, data, mods):
+        try:
+            n = str(data[self.dataset_name][1])
+        except (KeyError, ValueError, TypeError):
+            n = "---"
+        n = "<font size=15>" + n + "</font>"
+        self.setText(n)
+
+
+def main():
+    applet = SimpleApplet(DemoWidget)
+    applet.add_dataset("dataset", "dataset to show")
+    applet.run()
+
+if __name__ == "__main__":
+    main()