First init.

libraries/Adafruit_seesaw_Library/examples/encoder/multiple_encoders/multiple_encoders.ino

@@ -0,0 +1,160 @@
+/* Demo with 128x64 OLED display and multiple I2C encoders wired up. The sketch will auto-
+ * detect up to 4 encoder on the first 4 addresses. Twisting will display text on OLED
+ * and change neopixel color.
+ * set USE_OLED to true t
+ */
+
+#define USE_OLED false  // set to false to skip the OLED, true to use it!
+
+
+#include "Adafruit_seesaw.h"
+#include <seesaw_neopixel.h>
+
+#if USE_OLED
+  #include <Adafruit_SH110X.h>
+  #include <Fonts/FreeSans9pt7b.h>
+  Adafruit_SH1107 display = Adafruit_SH1107(64, 128, &Wire);
+#endif
+
+#define SS_SWITCH        24      // this is the pin on the encoder connected to switch
+#define SS_NEOPIX        6       // this is the pin on the encoder connected to neopixel
+
+#define SEESAW_BASE_ADDR          0x36  // I2C address, starts with 0x36
+
+
+// create 4 encoders!
+Adafruit_seesaw encoders[4];
+// create 4 encoder pixels
+seesaw_NeoPixel encoder_pixels[4] = {
+  seesaw_NeoPixel(1, SS_NEOPIX, NEO_GRB + NEO_KHZ800),
+  seesaw_NeoPixel(1, SS_NEOPIX, NEO_GRB + NEO_KHZ800),
+  seesaw_NeoPixel(1, SS_NEOPIX, NEO_GRB + NEO_KHZ800),
+  seesaw_NeoPixel(1, SS_NEOPIX, NEO_GRB + NEO_KHZ800)};
+
+int32_t encoder_positions[] = {0, 0, 0, 0};
+bool found_encoders[] = {false, false, false, false};
+
+void setup() {
+  Serial.begin(115200);
+
+  // wait for serial port to open
+  while (!Serial) delay(10);
+
+  Serial.println("128x64 OLED + seesaw Encoders test");
+
+#if USE_OLED
+  display.begin(0x3C, true); // Address 0x3C default
+  Serial.println("OLED begun");
+  display.display();
+  delay(500); // Pause for half second
+  display.setRotation(1);
+  display.setFont(&FreeSans9pt7b);
+  display.setTextColor(SH110X_WHITE);
+#endif
+
+  Serial.println("Looking for seesaws!");
+
+  for (uint8_t enc=0; enc<sizeof(found_encoders); enc++) {
+    // See if we can find encoders on this address
+    if (! encoders[enc].begin(SEESAW_BASE_ADDR + enc) ||
+        ! encoder_pixels[enc].begin(SEESAW_BASE_ADDR + enc)) {
+      Serial.print("Couldn't find encoder #");
+      Serial.println(enc);
+    } else {
+      Serial.print("Found encoder + pixel #");
+      Serial.println(enc);
+
+      uint32_t version = ((encoders[enc].getVersion() >> 16) & 0xFFFF);
+      if (version != 4991){
+        Serial.print("Wrong firmware loaded? ");
+        Serial.println(version);
+        while(1) delay(10);
+      }
+      Serial.println("Found Product 4991");
+
+      // use a pin for the built in encoder switch
+      encoders[enc].pinMode(SS_SWITCH, INPUT_PULLUP);
+
+      // get starting position
+      encoder_positions[enc] = encoders[enc].getEncoderPosition();
+
+      Serial.println("Turning on interrupts");
+      delay(10);
+      encoders[enc].setGPIOInterrupts((uint32_t)1 << SS_SWITCH, 1);
+      encoders[enc].enableEncoderInterrupt();
+
+      // set not so bright!
+      encoder_pixels[enc].setBrightness(30);
+      encoder_pixels[enc].show();
+
+      found_encoders[enc] = true;
+    }
+  }
+
+  Serial.println("Encoders started");
+}
+
+void loop() {
+#if USE_OLED
+  display.clearDisplay();
+  uint16_t display_line = 1;
+#endif
+
+  for (uint8_t enc=0; enc<sizeof(found_encoders); enc++) {
+     if (found_encoders[enc] == false) continue;
+
+     int32_t new_position = encoders[enc].getEncoderPosition();
+     // did we move around?
+     if (encoder_positions[enc] != new_position) {
+       Serial.print("Encoder #");
+       Serial.print(enc);
+       Serial.print(" -> ");
+       Serial.println(new_position);         // display new position
+       encoder_positions[enc] = new_position;
+
+       // change the neopixel color, mulitply the new positiion by 4 to speed it up
+       encoder_pixels[enc].setPixelColor(0, Wheel((new_position*4) & 0xFF));
+       encoder_pixels[enc].show();
+     }
+
+#if USE_OLED
+     // draw the display
+     display.setCursor(0, 20*display_line++);
+     display.print("Enc #");
+     display.print(enc);
+     display.print(" : ");
+     display.print(encoder_positions[enc]);
+#endif
+
+     if (! encoders[enc].digitalRead(SS_SWITCH)) {
+        Serial.print("Encoder #");
+        Serial.print(enc);
+        Serial.println(" pressed");
+#if USE_OLED
+        display.print(" P");
+#endif
+     }
+  }
+
+#if USE_OLED
+  display.display();
+#endif
+
+  // don't overwhelm serial port
+  yield();
+  delay(10);
+}
+
+
+uint32_t Wheel(byte WheelPos) {
+  WheelPos = 255 - WheelPos;
+  if (WheelPos < 85) {
+    return seesaw_NeoPixel::Color(255 - WheelPos * 3, 0, WheelPos * 3);
+  }
+  if (WheelPos < 170) {
+    WheelPos -= 85;
+    return seesaw_NeoPixel::Color(0, WheelPos * 3, 255 - WheelPos * 3);
+  }
+  WheelPos -= 170;
+  return seesaw_NeoPixel::Color(WheelPos * 3, 255 - WheelPos * 3, 0);
+}