diff --git a/docs/expert_setup.md b/docs/expert_setup.md
index 4724aae..9afc149 100644
--- a/docs/expert_setup.md
+++ b/docs/expert_setup.md
@@ -291,9 +291,9 @@ Also change the `DEVICES` line to add the device we are going to use `/dev/seria
 DEVICES="/dev/serial0"
 ```
 
-Finally, we want to add the parameter `-n` to `GPSD_OPTIONS`:
+Finally, we want to add the parameter `-n -r` to `GPSD_OPTIONS`:
 ```sh
-GPSD_OPTIONS="-n"
+GPSD_OPTIONS="-n -r"
 ```
 
 Save your work, and restart gpsd by running the following:
@@ -390,19 +390,25 @@ We need to edit the configuration of chrony, to activate both the GPS time synch
 
 Edit the file `/etc/chrony/chrony.conf` and replace its content with the following:
 ```
-server 0.pool.ntp.org maxpoll 5
-server 1.pool.ntp.org maxpoll 5
-server 2.pool.ntp.org maxpoll 5
-server 3.pool.ntp.org maxpoll 5
+pool pool.ntp.org iburst maxsources 4
 
 driftfile /var/lib/chrony/drift
 
-allow
-
+# allow to make big changes to clock if difference with ref clock is more than 1 seconds
 makestep 1 5
 
-refclock SHM 2 pps refid NMEA
+refclock SHM 0 refid NMEA offset 0.006
+refclock SHM 1 pps refid NME+
+refclock SOCK /var/run/chrony.sock delay 0.0 refid SOCK
+# noselect poll 8 filter 1000
 #refclock PPS /dev/pps0 precision 1e-7 noselect refid GPPS
+
+allow all
+
+rtcsync
+
+logdir /var/log/chrony
+log rtc refclocks
 ```
 
 Before restarting `chrony`, we need to make sure the timesync service from systemd is deactivated:
diff --git a/docs/hat_hardware.md b/docs/hat_hardware.md
index 76b12a5..2d6ae92 100644
--- a/docs/hat_hardware.md
+++ b/docs/hat_hardware.md
@@ -10,6 +10,11 @@ Configured through a kernel driver.
 #### OLED Display
 Address 0x3c
 
+#### LED control: LM36011
+Address 0x64
+Control through specific software, current range from 0 to 376mA in normal mode, up to 1.5A in flash mode.
+
+
 ### SPI0 Bus
 #### Motor Controller 0: TMC5160
 Chip Enable: SPI0_CE0
@@ -32,14 +37,11 @@ GPIO20 for Stall output
 #### Fan control
 PWM1 control through GPIO13
 
-#### LED0 control
-PWM dimming frequency range: 6.5 kHz to 100 kHz
-PWM0 control through GPIO18
-
-#### LED1 control
-PWM dimming frequency range: 6.5 kHz to 100 kHz
-PWM0 control through GPIO12
+#### LED Output selection
+GPIO18: high for LED1, low for LED2
 
+#### LED Strobe
+GPIO22 for pulse
 
 ### I2C0 Bus
 #### EEPROM M24C32
diff --git a/docs/mqtt_messages.md b/docs/mqtt_messages.md
index bb46b64..f7cd415 100644
--- a/docs/mqtt_messages.md
+++ b/docs/mqtt_messages.md
@@ -84,12 +84,17 @@ This topic can also receive a config update message:
 }
 ```
 
-A camera settings message can also be received here. The fields `iso` and `shutter_speed` are optionals:
+A camera settings message can also be received here. The fields `iso`, `shutter_speed`, `white_balance_gain`, `white_balance` and `image_gain` are optionals:
 ```json
 {
   "action": "settings",
-  "iso": 100,
-  "shutter_speed": 40
+  "settings":{
+    "iso": 100,
+    "shutter_speed": 40,
+    "white_balance_gain": {"red": 100, "blue": 100},
+    "white_balance": "auto",
+    "image_gain": {"analog": 100, "digital": 100}
+  }
 }
 ```
 
@@ -112,9 +117,13 @@ This topic controls the segmentation process. The message is a JSON object:
 
 `action` can also be `stop`.
 The `action` element is the only element required. If no `path` is supplied, the whole images repository is segmented recursively (this is very long!).
+
 `force` is going to overcome the presence of the file `done` that is here to prevent for resegmenting a folder already segmented.
+
 `recursive` will force parsing all folders below `path`.
+
 `ecotaxa` activates the export of an ecotaxa compatible archive.
+
 `keep` allows to remove or keep the roi (when you do an ecotaxa export, no effects otherwise, the roi are kept).
 
 - Receive only