From bcb5729944e8034b0382a314bc21c7ef6b7b1646 Mon Sep 17 00:00:00 2001
From: Bernd Giesecke <bernd@giesecke.tk>
Date: Sat, 9 Jan 2016 23:43:37 +0800
Subject: [PATCH] Changed return value of getEvent

value of 0 could be a valid value in darkness, better to return a value > 65535 to report saturation and return false from getEvent in that case!
---
 Adafruit_TSL2561_U.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Adafruit_TSL2561_U.cpp b/Adafruit_TSL2561_U.cpp
index 0111ef6..0517185 100644
--- a/Adafruit_TSL2561_U.cpp
+++ b/Adafruit_TSL2561_U.cpp
@@ -385,10 +385,10 @@ uint32_t Adafruit_TSL2561_Unified::calculateLux(uint16_t broadband, uint16_t ir)
       break;
   }
 
-  /* Return 0 lux if the sensor is saturated */
+  /* Return 65536 lux if the sensor is saturated */
   if ((broadband > clipThreshold) || (ir > clipThreshold))
   {
-    return 0;
+    return 65536;
   }
 
   /* Get the correct scale depending on the intergration time */
@@ -476,6 +476,8 @@ uint32_t Adafruit_TSL2561_Unified::calculateLux(uint16_t broadband, uint16_t ir)
 /**************************************************************************/
 /*!
     @brief  Gets the most recent sensor event
+    returns true if sensor reading is between 0 and 65535 lux
+    returns false if sensor is saturated
 */
 /**************************************************************************/
 bool Adafruit_TSL2561_Unified::getEvent(sensors_event_t *event)
@@ -494,6 +496,9 @@ bool Adafruit_TSL2561_Unified::getEvent(sensors_event_t *event)
   getLuminosity(&broadband, &ir);
   event->light = calculateLux(broadband, ir);
   
+  if (event->light == 65536) {
+    return false;	
+  }
   return true;
 }