First init.

libraries/Adafruit_seesaw_Library/examples/encoder_delta/encoder_delta.ino

@@ -0,0 +1,64 @@
+/*
+ * This example helps demonstrates getEncoderDelta().
+ * 
+ *   position = the current encoder position
+ *      delta = the change in position since last read
+ *      
+ * With this sketch running, open the Serial Monitor. It may also help
+ * to turn on "Show timestamp". Then play with turning the encoder between 
+ * print outs to see how the values change.
+ * 
+ * If the encoder does ~not~ move between reads, then:
+ *   - position will be the same value
+ *   - delta will be zero
+ *   
+ * NOTE: reading position or delta resets delta to zero
+ */
+ 
+#include "Adafruit_seesaw.h"
+#include <seesaw_neopixel.h>
+
+#define SEESAW_ADDR          0x36
+
+Adafruit_seesaw ss;
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) delay(10);
+
+  Serial.println("Looking for seesaw!");
+  
+  if (! ss.begin(SEESAW_ADDR)) {
+    Serial.println("Couldn't find seesaw on default address");
+    while(1) delay(10);
+  }
+  Serial.println("seesaw started");
+
+  uint16_t pid;
+  uint8_t year, mon, day;
+
+  ss.getProdDatecode(&pid, &year, &mon, &day);
+  Serial.print("PID: "); Serial.println(pid);
+  Serial.print("Firmware:");
+  Serial.print(2000+year); Serial.print("/");
+  Serial.print(mon); Serial.print("/");
+  Serial.println(day);
+}
+
+void loop() {
+  int32_t position;
+  int32_t delta;
+
+  // get delta and position
+  delta = ss.getEncoderDelta();        // also resets delta to zero
+  position = ss.getEncoderPosition();  // this also resets delta to zero
+                                       // so getEncoderDelta() is called first
+
+  // print info
+  Serial.print("position: "); Serial.println(position);
+  Serial.print("   delta: "); Serial.println(delta);
+
+  // read once every two seconds
+  // this is intentionally slow to allow user to easily turn encoder between reads
+  delay(2000);
+}