Merge pull request #3039 from FoamyGuy/sparklemotion_stick_arduino_i2smic

sparkle motion stick arduino i2s mic example

Sparkle_Motion_Stick_Examples/Arduino_I2S_SparkleMotionStick/Arduino_I2S_SparkleMotionStick.ino

@@ -0,0 +1,44 @@
+// SPDX-FileCopyrightText: 2025 Limor Fried for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include <Arduino.h>
+#include "ESP_I2S.h"
+
+// I2S pin definitions for Sparklemotion
+const uint8_t I2S_SCK = 14;  // BCLK
+const uint8_t I2S_WS = 12;   // LRCLK
+const uint8_t I2S_DIN = 13;  // DATA_IN
+
+// Create I2S instance
+I2SClass i2s;
+
+void setup() {
+  // Fast serial for plotting
+  Serial.begin(500000);
+
+  // Initialize I2S
+  i2s.setPins(I2S_SCK, I2S_WS, -1, I2S_DIN);
+  if (!i2s.begin(I2S_MODE_STD, 44100, I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_MONO, I2S_STD_SLOT_LEFT)) {
+    Serial.println("Failed to initialize I2S bus!");
+    return;
+  }
+
+  Serial.println("I2S Mic Plotter Ready");
+}
+
+void loop() {
+  static uint32_t lastPlot = 0;
+
+  // Get a sample
+  int32_t sample = i2s.read();
+
+  // Only plot every 1ms (1000 samples/sec is plenty for visualization)
+  if (millis() - lastPlot >= 1) {
+    if (sample >= 0) {  // Valid sample
+      // Plot both raw and absolute values
+      Serial.printf("%d,%d\n", (int16_t)sample, abs((int16_t)sample));
+    }
+    lastPlot = millis();
+  }
+}