First init.

libraries/Adafruit_seesaw_Library/examples/encoder/encoder_basic/encoder_basic.ino

@@ -0,0 +1,91 @@
+/*
+ * This example shows how to read from a seesaw encoder module.
+ * The available encoder API is:
+ *      int32_t getEncoderPosition();
+        int32_t getEncoderDelta();
+        void enableEncoderInterrupt();
+        void disableEncoderInterrupt();
+        void setEncoderPosition(int32_t pos);
+ */
+#include "Adafruit_seesaw.h"
+#include <seesaw_neopixel.h>
+
+#define SS_SWITCH        24
+#define SS_NEOPIX        6
+
+#define SEESAW_ADDR          0x36
+
+Adafruit_seesaw ss;
+seesaw_NeoPixel sspixel = seesaw_NeoPixel(1, SS_NEOPIX, NEO_GRB + NEO_KHZ800);
+
+int32_t encoder_position;
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) delay(10);
+
+  Serial.println("Looking for seesaw!");
+  
+  if (! ss.begin(SEESAW_ADDR) || ! sspixel.begin(SEESAW_ADDR)) {
+    Serial.println("Couldn't find seesaw on default address");
+    while(1) delay(10);
+  }
+  Serial.println("seesaw started");
+
+  uint32_t version = ((ss.getVersion() >> 16) & 0xFFFF);
+  if (version  != 4991){
+    Serial.print("Wrong firmware loaded? ");
+    Serial.println(version);
+    while(1) delay(10);
+  }
+  Serial.println("Found Product 4991");
+
+  // set not so bright!
+  sspixel.setBrightness(20);
+  sspixel.show();
+  
+  // use a pin for the built in encoder switch
+  ss.pinMode(SS_SWITCH, INPUT_PULLUP);
+
+  // get starting position
+  encoder_position = ss.getEncoderPosition();
+
+  Serial.println("Turning on interrupts");
+  delay(10);
+  ss.setGPIOInterrupts((uint32_t)1 << SS_SWITCH, 1);
+  ss.enableEncoderInterrupt();
+}
+
+void loop() {
+  if (! ss.digitalRead(SS_SWITCH)) {
+    Serial.println("Button pressed!");
+  }
+
+  int32_t new_position = ss.getEncoderPosition();
+  // did we move arounde?
+  if (encoder_position != new_position) {
+    Serial.println(new_position);         // display new position
+
+    // change the neopixel color
+    sspixel.setPixelColor(0, Wheel(new_position & 0xFF));
+    sspixel.show();
+    encoder_position = new_position;      // and save for next round
+  }
+
+  // don't overwhelm serial port
+  delay(10);
+}
+
+
+uint32_t Wheel(byte WheelPos) {
+  WheelPos = 255 - WheelPos;
+  if (WheelPos < 85) {
+    return sspixel.Color(255 - WheelPos * 3, 0, WheelPos * 3);
+  }
+  if (WheelPos < 170) {
+    WheelPos -= 85;
+    return sspixel.Color(0, WheelPos * 3, 255 - WheelPos * 3);
+  }
+  WheelPos -= 170;
+  return sspixel.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
+}