First init.

libraries/Adafruit_seesaw_Library/examples/digital/blink/blink.ino

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+/*
+ * This example shows how to blink a pin on a seesaw.
+ * Attach the positive (longer lead) of the LED to pin 15 on the seesaw, and
+ * the negative lead of the LED to ground through a 1k ohm resistor.
+ */
+
+#include "Adafruit_seesaw.h"
+
+Adafruit_seesaw ss;
+
+#define BLINK_PIN 15
+
+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);
+  }
+  
+  Serial.println(F("seesaw started OK!"));
+
+  ss.pinMode(BLINK_PIN, OUTPUT);
+}
+
+void loop() {
+  ss.digitalWrite(BLINK_PIN, HIGH);   // turn the LED on (HIGH is the voltage level)
+  delay(100);                       // wait for a second
+  ss.digitalWrite(BLINK_PIN, LOW);    // turn the LED off by making the voltage LOW
+  delay(100);  
+}