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diff --git a/arduino/libraries/Bluefruit52Lib/examples/Hardware/hwpwm/hwpwm.ino b/arduino/libraries/Bluefruit52Lib/examples/Hardware/hwpwm/hwpwm.ino
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+++ b/arduino/libraries/Bluefruit52Lib/examples/Hardware/hwpwm/hwpwm.ino
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+/*********************************************************************
+ This is an example for our Feather Bluefruit modules
+
+ Pick one up today in the adafruit shop!
+
+ Adafruit invests time and resources providing this open source code,
+ please support Adafruit and open-source hardware by purchasing
+ products from Adafruit!
+
+ MIT license, check LICENSE for more information
+ All text above, and the splash screen below must be included in
+ any redistribution
+*********************************************************************/
+
+/*
+ * This sketch use different Hardware PWMs for LED Blue and Red
+ * running with different frequency
+ * - PWM0 : clock/1  ~ 16Mhz
+ * - PWM1 : clock/16  ~ 1Mhz 
+ *  
+ * While LED RED looks solid, LED BLUE will blink while fading 
+ * (due to its lower freq). Furthermore LED RED is inverted 
+ * compared to LED BLUE (PWM2) --> They fade in opposite direction. 
+ */
+
+#include <Arduino.h>
+
+/**************************************************************************/
+/*!
+    @brief  The setup function runs once when reset the board
+*/
+/**************************************************************************/
+void setup()
+{  
+  // Add LED RED to PWM0
+  HwPWM0.addPin( LED_RED );
+
+  // Add LED BLUE to PWM1
+  HwPWM1.addPin( LED_BLUE );
+
+  // Enable PWM modules with 15-bit resolutions(max) but different clock div
+  HwPWM0.begin();
+  HwPWM0.setResolution(15);
+  HwPWM0.setClockDiv(PWM_PRESCALER_PRESCALER_DIV_1); // freq = 16Mhz
+  
+  HwPWM1.begin();
+  HwPWM1.setResolution(15);
+  HwPWM1.setClockDiv(PWM_PRESCALER_PRESCALER_DIV_16); // freq = 1Mhz
+}
+
+/**************************************************************************/
+/*!
+    @brief  The loop function runs over and over again forever
+*/
+/**************************************************************************/
+void loop()
+{
+  const int maxValue = bit(15) - 1;
+  
+  // fade in from min to max
+  for (int fadeValue = 0 ; fadeValue <= maxValue; fadeValue += 1024) 
+  {
+    // Write same value but inverted for Led Blue
+    HwPWM0.writePin(LED_RED, fadeValue, false);
+    HwPWM1.writePin(LED_BLUE, fadeValue, true);
+        
+    // wait for 30 milliseconds to see the dimming effect
+    delay(30);
+  }
+
+  // fade out from max to min
+  for (int fadeValue = maxValue ; fadeValue >= 0; fadeValue -= 1024) 
+  {  
+    // Write same value but inverted for Led Blue
+    HwPWM0.writePin(LED_RED, fadeValue, false);
+    HwPWM1.writePin(LED_BLUE, fadeValue, true);
+    
+    // wait for 30 milliseconds to see the dimming effect
+    delay(30);
+  }
+}