pid cal

docs/manual.md

@@ -38,6 +38,7 @@ description: Manual
   - [Temperature Sensor](#temperature-sensor)
   - [Zero-Cross Detection](#zero-cross-detection)
   - [Compatibility with EV box like OpenEVSE](#compatibility-with-ev-box-like-openevse)
+  - [PID Tuning](#pid-tuning)
 - [Help and support](#help-and-support)
 
 ## Quick Start
@@ -581,6 +582,11 @@ You can use this value to inject in the EV box in order to prioritize EV chargin
 This is usually acceptable to give the EV box a priority over the water tank, because the water tank only need a small amount of routed energy to start heating, while the EV usually requires a threshold to start charging.
 So the router will take whatever is not used by the EV box.
 
+### PID Tuning
+
+The back config page `http://<ip>/config` has a PID tuning section which allows you to tune the PID, if you know what you are doing.
+
+
 ## Help and support
 
 - **Facebook Group**: [https://www.facebook.com/groups/yasolr](https://www.facebook.com/groups/yasolr)