First init.

libraries/Adafruit_seesaw_Library/examples/analog/Fade/Fade.ino

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+/*
+  Fade
+
+  This example shows how to fade an LED on pin 6 of a seesaw board using the analogWrite()
+  function.
+
+  The analogWrite() function uses PWM, so if you want to change the pin you're
+  using, be sure to use another PWM capable pin. 
+  On the SAMD09 breakout these are pins 5, 6, and 7
+  On the ATtinyxy7 breakout these are pins 0, 1, 9, 12, 13
+  On the ATtinyxy6 breakout these are pins 0, 1, 7, 11, 16
+*/
+
+#include "Adafruit_seesaw.h"
+
+Adafruit_seesaw ss;
+
+int led = 6;           // the PWM pin the LED is attached to
+int brightness = 0;    // how bright the LED is
+int fadeAmount = 5;    // how many points to fade the LED by
+
+// the setup routine runs once when you press reset:
+void setup() {
+  Serial.begin(115200);
+  
+  while (!Serial) delay(10);   // wait until serial port is opened
+  
+  if(!ss.begin()){
+    Serial.println("seesaw not found!");
+    while(1) delay(10);
+  }
+}
+
+// the loop routine runs over and over again forever:
+void loop() {
+  // set the brightness of the LED:
+  ss.analogWrite(led, brightness);
+
+  // change the brightness for next time through the loop:
+  brightness = brightness + fadeAmount;
+
+  // reverse the direction of the fading at the ends of the fade:
+  if (brightness <= 0 || brightness >= 255) {
+    fadeAmount = -fadeAmount;
+  }
+  // wait for 30 milliseconds to see the dimming effect
+  delay(30);
+}