diff --git a/UI.cpp b/UI.cpp
new file mode 100644
index 0000000..454e034
--- /dev/null
+++ b/UI.cpp
@@ -0,0 +1,22 @@
+#include <M5StickC.h>
+#include "Kernel.h"
+
+int UI(int pid, unsigned int signal)
+{
+  if (signal & SIGNAL_START)
+  {
+    Kernel_signal_mask(pid, SIGNAL_START | SIGNAL_STOP | SIGNAL_REDRAW);
+  }
+  if (signal & SIGNAL_STOP)
+  {
+    return 255;
+  }
+  if (signal & SIGNAL_REDRAW)
+  {
+    M5.Lcd.fillScreen(TFT_DARKGREY);
+    M5.Lcd.setRotation(3);
+    M5.Lcd.setTextColor(TFT_WHITE, TFT_DARKGREY);
+  }
+
+  return 0;
+}
diff --git a/UI.h b/UI.h
new file mode 100644
index 0000000..fb3fa97
--- /dev/null
+++ b/UI.h
@@ -0,0 +1,2 @@
+
+int UI(int pid, unsigned int signal);