diff --git a/Software/co2ampel/co2ampel.h b/Software/co2ampel/co2ampel.h
index 6675b1a..c258700 100644
--- a/Software/co2ampel/co2ampel.h
+++ b/Software/co2ampel/co2ampel.h
@@ -9,6 +9,8 @@
 #ifndef CO2AMPEL_H
 #define CO2AMPEL_H
 
+#include <ESP8266httpUpdate.h>
+
 void scd30ForceRecalibration(uint16_t concentration);
 void setThresholdGreen(uint16_t th);
 void setConfig(String& jsonString);
diff --git a/Software/co2ampel/co2ampel.ino b/Software/co2ampel/co2ampel.ino
index 71085ba..f3c3395 100644
--- a/Software/co2ampel/co2ampel.ino
+++ b/Software/co2ampel/co2ampel.ino
@@ -141,13 +141,14 @@ void startCalibration() {
   }
 }
 
+
 /**************************** setup() *************************************************/
 
 void setup()
 {
   Serial.begin(115200);
   setupLED();
-  
+
   // init IOs
   #ifdef GPIO_SWITCH
   pinMode(GPIO_SWITCH, INPUT);
@@ -161,6 +162,7 @@ void setup()
   Serial.println("Start CO2-Ampel");
 
   configStatus=configManager.readConfig("/config.json");
+  ledSetBrightnes(configManager.getUintValue("led_brightness", LED_BRIGHTNES)/100.0);
 
   // check if mqtt credentials are set
   if(configStatus==0) {
diff --git a/Software/co2ampel/config.h b/Software/co2ampel/config.h
index e289113..61cd086 100644
--- a/Software/co2ampel/config.h
+++ b/Software/co2ampel/config.h
@@ -73,7 +73,7 @@ enum Color {GREEN, YELLOW, RED, BLUE, DARK, WHITE, GREEN2, YELLOW2, RED2};
 #define NUMPIXELS 14
 #define GPIO_GREEN 12
 #define GPIO_RED 0
-#define LED_BRIGHTNES 0.5;
+#define LED_BRIGHTNES 59 // % (0=dark, 100=full) overriden by led_brightness from config.json
 //SCD30
 #define GPIO_SCD30_RDY 13
 #define SCD30_TEMP_OFFSET 7.0
diff --git a/Software/co2ampel/data/config.json b/Software/co2ampel/data/config.json
index 127447a..b08cf5a 100644
--- a/Software/co2ampel/data/config.json
+++ b/Software/co2ampel/data/config.json
@@ -17,5 +17,6 @@
   "th_yellow_high": 1500,
   "th_red": 2000,
   "selftest_buzzer": 0,
+  "led_brightness": 50,
   "version": "1"
 }
diff --git a/Software/co2ampel/led.cpp b/Software/co2ampel/led.cpp
index 901c94c..3ed8207 100644
--- a/Software/co2ampel/led.cpp
+++ b/Software/co2ampel/led.cpp
@@ -1,8 +1,10 @@
 #include "led.h"
 
+double ledBrightnes;
+
 #ifdef PCBV2
-Adafruit_NeoPixel led1 = Adafruit_NeoPixel(NUMPIXELS, GPIO_GREEN, NEO_GRB + NEO_KHZ800);
-Adafruit_NeoPixel led2 = Adafruit_NeoPixel(NUMPIXELS, GPIO_RED, NEO_GRB + NEO_KHZ800);
+Adafruit_NeoPixel led1 = Adafruit_NeoPixel(NUMPIXELS, GPIO_GREEN, NEO_GRB + NEO_KHZ400);
+Adafruit_NeoPixel led2 = Adafruit_NeoPixel(NUMPIXELS, GPIO_RED, NEO_GRB + NEO_KHZ400);
 #endif
 /*
   CO2 Ampel - PCB v2.0 + v1.0
@@ -12,8 +14,10 @@ Adafruit_NeoPixel led2 = Adafruit_NeoPixel(NUMPIXELS, GPIO_RED, NEO_GRB + NEO_KH
   License: MIT
 */
 
+
+
 #ifdef PCBV1
-void setupLED() {
+void setupLED(ConfigManager &configManager) {
   pinMode(GPIO_GREEN, OUTPUT);
   pinMode(GPIO_YELLOW, OUTPUT);
   pinMode(GPIO_RED, OUTPUT);
@@ -47,7 +51,8 @@ void setupLED() {
 }
 
 void ledSetColor(Color color) {
-  double brightnes=LED_BRIGHTNES;
+
+  double brightnes=ledBrightnes;
   int switchState = digitalRead(GPIO_SWITCH);
   if(!switchState) brightnes=0;
   
@@ -91,3 +96,7 @@ void ledBlink(Color c1, Color c2, uint32_t time)
   }
   ledSetColor(DARK);
 }
+
+void ledSetBrightnes(double brightness) { 
+  ledBrightnes = brightness; 
+}
diff --git a/Software/co2ampel/led.h b/Software/co2ampel/led.h
index fd09aba..f6f34f6 100644
--- a/Software/co2ampel/led.h
+++ b/Software/co2ampel/led.h
@@ -16,5 +16,6 @@
 void setupLED();
 void ledSetColor(Color color);
 void ledBlink(Color c1, Color c2, uint32_t time);
+void ledSetBrightnes(double brightness);
 
 #endif
diff --git a/Software/co2ampel/mqtt.cpp b/Software/co2ampel/mqtt.cpp
index 082269c..ccb53c3 100644
--- a/Software/co2ampel/mqtt.cpp
+++ b/Software/co2ampel/mqtt.cpp
@@ -128,5 +128,25 @@ void mqttCallback(char* topic, byte* payload, unsigned int length) {
       WiFi.disconnect(true); // disconnect and delete credentials in flash
       while (1); // freeze and reboot due to watchdog 
     }
+  } else if (String(topic) == "config/"+mqttUsername+"/ota") {
+    updateFirmware(messageTemp.c_str());
   }
 }
+
+void updateFirmware(const char* url) {
+  Serial.println("Start Firmware Update");
+  t_httpUpdate_return ret = ESPhttpUpdate.update( wifiClient, url );
+  switch(ret) {
+    case HTTP_UPDATE_FAILED:
+      Serial.printf("HTTP_UPDATE_FAILD Error (%d): %s", ESPhttpUpdate.getLastError(), ESPhttpUpdate.getLastErrorString().c_str());
+      break;
+
+    case HTTP_UPDATE_NO_UPDATES:
+      Serial.println("HTTP_UPDATE_NO_UPDATES");
+      break;
+
+    case HTTP_UPDATE_OK:
+      Serial.println("HTTP_UPDATE_OK");
+      break;
+    }
+}
diff --git a/Software/co2ampel/mqtt.h b/Software/co2ampel/mqtt.h
index b227772..97383ed 100644
--- a/Software/co2ampel/mqtt.h
+++ b/Software/co2ampel/mqtt.h
@@ -23,5 +23,6 @@ void loopMQTT(ConfigManager &configManager);
 void setupMQTT(ConfigManager &configManager);
 void publishValues(ConfigManager &configManager, uint16_t co2, double hum ,double temp, double pressure, double temp2, Color color, float RssI, uint32_t runtime);
 void mqttCallback(char* topic, byte* payload, unsigned int length);
+void updateFirmware(const char* url);
 
 #endif