diff --git a/lib/Brightness/Brightness.cpp b/lib/Brightness/Brightness.cpp
new file mode 100644
index 0000000..529bc91
--- /dev/null
+++ b/lib/Brightness/Brightness.cpp
@@ -0,0 +1,57 @@
+/*
+  .cpp - Brightness Sensor Library
+  Copyright (c) 2020-2021, Stefan Brand
+  All rights reserved.
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+  1. Redistributions of source code must retain the above copyright notice, this
+     list of conditions and the following disclaimer.
+  2. Redistributions in binary form must reproduce the above copyright notice,
+     this list of conditions and the following disclaimer in the documentation
+     and/or other materials provided with the distribution.
+  3. Neither the name of the copyright holder nor the names of its
+     contributors may be used to endorse or promote products derived from
+     this software without specific prior written permission.
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <Arduino.h>
+#include "Brightness.h"
+
+// Constructor - Inititalize Hardware UART
+Brightness::Brightness(uint8_t a, uint8_t c) {
+    this->anode = a;
+    this->cathode = c;
+}
+
+uint8_t Brightness::getSensorData(char *payload, uint8_t startbyte) {
+  
+  uint16_t counter;
+
+  pinMode(this->anode, OUTPUT);
+  digitalWrite(this->anode, LOW);
+
+  pinMode(this->cathode, OUTPUT);
+  digitalWrite(this->cathode, HIGH);
+  delayMicroseconds(4);
+ 
+  pinMode(this->cathode, INPUT);
+  digitalWrite(this->cathode, LOW);
+
+  for ( counter = 0; counter < 65000; counter++) {
+    if (digitalRead(this->cathode)==0) break;
+     delayMicroseconds(5);
+  }
+  
+  uint16ToPayload(65000-counter, payload, startbyte);
+  return startbyte+2;
+}
\ No newline at end of file
diff --git a/lib/Brightness/Brightness.h b/lib/Brightness/Brightness.h
new file mode 100644
index 0000000..c4502eb
--- /dev/null
+++ b/lib/Brightness/Brightness.h
@@ -0,0 +1,46 @@
+/*
+  Brightness.h - Brightness Sensor Library
+  Copyright (c) 2020-2021, Stefan Brand
+  All rights reserved.
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+  1. Redistributions of source code must retain the above copyright notice, this
+     list of conditions and the following disclaimer.
+  2. Redistributions in binary form must reproduce the above copyright notice,
+     this list of conditions and the following disclaimer in the documentation
+     and/or other materials provided with the distribution.
+  3. Neither the name of the copyright holder nor the names of its
+     contributors may be used to endorse or promote products derived from
+     this software without specific prior written permission.
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef Brightness_H
+#define Brightness_H
+
+#include "../../include/attsensor.h"
+#include "../../include/debug.h"
+
+
+class Brightness : public AttSensor {
+  private:
+    uint8_t anode, cathode;
+
+  public:
+    Brightness(uint8_t a, uint8_t c);
+    uint8_t getSensorData(char *payload, uint8_t startbyte);
+    void calibrate(void) {};
+    void initialize(void) {};
+    uint8_t numBytes(void) { return 2; };
+};
+
+#endif
\ No newline at end of file
diff --git a/payload/index.html b/payload/index.html
index 5368bc7..d75906a 100644
--- a/payload/index.html
+++ b/payload/index.html
@@ -73,6 +73,10 @@
           <input type="checkbox" value="hm330x" onchange="updateDecoder();">
           HM330x
         </label>
+        <label>
+          <input type="checkbox" value="brightness" onchange="updateDecoder();">
+          Brightness
+        </label>
         <label>
           <input type="checkbox" value="ds18b20" onchange="updateDecoder();">
           DS18B20
@@ -114,6 +118,9 @@
           { "name": "pm2_5", "type": "UInt16", "factor": 1, "multi": false },
           { "name": "pm10", "type": "UInt16", "factor": 1, "multi": false },
         ],
+        "brightness": [
+          { "name": "brightness", "type": "UInt16", "factor": 1, "multi": false },
+        ],
         "ds18b20": [
           { "name": "t", "type": "Int16", "factor": 100, "multi": true },
         ]
diff --git a/src/config.h.example b/src/config.h.example
index eba7578..ab3b305 100644
--- a/src/config.h.example
+++ b/src/config.h.example
@@ -60,6 +60,7 @@
 // #define HAS_BME280
 // #define HAS_SHT21
 // #define HAS_HM330x
+// #define HAS_BRIGHTNESS
 // #define HAS_DS18B20
 
 /**************************************************************************************************************************
@@ -77,6 +78,12 @@
 // Setting it to 0 disables Sleep Mode
 #define HM330x_SLEEP_PIN 0
 
+// LED connected between 2 pins, switched in reverse direction for brightness measurement
+// BRIGHTNESS_LED_A -> LED Anode
+// BRIGHTNESS_LED_C -> LED Cathode
+#define BRIGHTNESS_LED_A PIN_PC0
+#define BRIGHTNESS_LED_C PIN_PC1
+
 /**************************************************************************************************************************
  * How many minutes to sleep between Measuring/Sending
  * Since this is a 2-byte value internally, intervals between 1 and 65536 are possible
diff --git a/src/main.cpp b/src/main.cpp
index 32f4b95..4a51df8 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -39,6 +39,9 @@
 #ifdef HAS_HM330x
   #include <HM330x.h>
 #endif
+#ifdef HAS_BRIGHTNESS
+  #include <Brightness.h>
+#endif
 #ifdef HAS_DS18B20
   #include <DS18B20.h>
 #endif
@@ -369,6 +372,10 @@ void setup()
     sensors[i] = new HM330x(HM330x_SLEEP_PIN);
     i++;
   #endif
+  #ifdef HAS_BRIGHTNESS
+    sensors[i] = new Brightness(BRIGHTNESS_LED_A, BRIGHTNESS_LED_C);
+    i++;
+  #endif
   #ifdef HAS_DS18B20
     sensors[i] = new DS18B20(DS18B20_PIN, DS18B20_RES);
     i++;