diff --git a/doku.md b/doku.md
index e1c1ade..b53daab 100644
--- a/doku.md
+++ b/doku.md
@@ -54,14 +54,24 @@ else
     server.streamFile(f, mime::getContentType(SRH::_path), requestMethod);
 ```
 
-LED_sequence_v1:
+### HW issues
+- GPIO2 used as input -> must be high during startup
+
+### FSM 2 - to do
+- stairway light switches off after timeout
+- switches concurrently on again if sensor is still high
+- desired behavior? Defective Sensor would cause continuos animation
+- edge detection / interrupts as solution ?
+
+
+### LED_sequence_v1:
 TODO: 
 - disable led stripes after defined time (webserver paramter?)
 - define what to do if people enter stairs from different directions
 - CAUTION: Sensor-Deadtime at LEAST 8 seconds
 - --> switch off with person leaving stairs might not be possible
 
-Webserver on v0.3.0 now working with LittleFS
+### Webserver on v0.3.0 now working with LittleFS
 TODO:
 - check dir for files automatic
 - move handleNotFound to httpserver.h
diff --git a/lib/PCA9685-Arduino b/lib/PCA9685-Arduino
index a70be39..23e06c0 160000
--- a/lib/PCA9685-Arduino
+++ b/lib/PCA9685-Arduino
@@ -1 +1 @@
-Subproject commit a70be39257e317d35e9118b385006a1e030e6452
+Subproject commit 23e06c06a6026801a856141f64a6de54dd493b47