diff --git a/sanro.ino b/sanro.ino
new file mode 100644
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+++ b/sanro.ino
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+/***************************************************************
+ *                                                             *
+ *                Taiko Sanro - Arduino                        *
+ *   Support Arduino models with ATmega32u4 microprocessors    *
+ *                                                             *
+ *             Copyright © 2016 Shiky Chang                    *
+ *                zhangxunpx@gmail.com                         *
+ *                                                             *
+ ***************************************************************/
+
+#define MODE_JIRO 0
+
+#define CHANNELS 4
+
+// Input delay (in seconds) = (SAMPLE_CACHE_LENGTH + POWER_CACHE_LENGTH) / sample frequency
+// _CACHE_LENGTH must be less than 256
+#define SAMPLE_CACHE_LENGTH 150
+#define POWER_CACHE_LENGTH 5
+
+// _THRES must be less than 2^32 = 4294967296 = 4.29e9
+#define LIGHT_THRES 3000000
+#define HEAVY_THRES 10000000
+
+#include <Keyboard.h>
+
+int channelSample [CHANNELS];
+int sampleCache [CHANNELS][SAMPLE_CACHE_LENGTH];
+short int sampleCacheIndex [CHANNELS];
+
+long int power [CHANNELS];
+long int powerCache [CHANNELS][POWER_CACHE_LENGTH];
+short int powerCacheIndex [CHANNELS];
+
+bool triggered [CHANNELS];
+
+void setup() {
+  Serial.begin (9600);
+  Keyboard.begin ();
+  for (short int i = 0; i < CHANNELS; i++) {
+    for (short int j = 0; j < SAMPLE_CACHE_LENGTH; j++) {
+      sampleCache [i][j] = 0;
+    }
+    sampleCacheIndex [i] = SAMPLE_CACHE_LENGTH - 1; 
+    for (short int j = 0; j < POWER_CACHE_LENGTH; j++) {
+      powerCache [i][j] = 0;
+    }
+    powerCacheIndex [i] = POWER_CACHE_LENGTH - 1; 
+    power [i] = 0;
+    triggered [i] = false;
+  }
+}
+
+void loop() {
+
+// Analog input: 0~5V -> 0~1023
+  channelSample[0] = analogRead (A0);  // L don
+  channelSample[1] = analogRead (A1);  // R don
+  channelSample[2] = analogRead (A2);  // L kat
+  channelSample[3] = analogRead (A3);  // R kat
+
+// Cache
+// Start status: [ 0 ] [ 1 ] [ 2 ] ... [n-3] [n-2] [n-1]
+//                 |                                 |
+//               Oldest                           Pointer
+//
+//   New status: [NEW] [ 1 ] [ 2 ] ... [n-3] [n-2] [n-1]
+//    (Loop 1)     |     |
+//              Pointer  |
+//                     Oldest
+  for (short int i = 0; i < CHANNELS; i++) {
+    sampleCacheIndex [i] ++;
+    sampleCacheIndex [i] %= SAMPLE_CACHE_LENGTH;
+    sampleCache [i][sampleCacheIndex [i]] = channelSample [i];
+    power [i] += channelSample [i] * channelSample [i];
+    int oldest = sampleCache [i][(sampleCacheIndex [i] + 1) % SAMPLE_CACHE_LENGTH];
+    power [i] -= oldest * oldest;
+    if (power [i] < LIGHT_THRES) {
+      power [i] = 0;
+      triggered [i] = false;
+    }
+    
+    powerCacheIndex [i] ++;
+    powerCacheIndex [i] %= POWER_CACHE_LENGTH;
+    powerCache [i][powerCacheIndex [i]] = power [i];
+
+// In the power cache, if we see any drop, we regard this point as a maximum
+    for (short int j = 0; j < POWER_CACHE_LENGTH; j++){
+      if (powerCache [i][(powerCacheIndex [i] + j) % POWER_CACHE_LENGTH] < powerCache [i][(powerCacheIndex [i] + j - 1) % POWER_CACHE_LENGTH]) {
+#if MODE_JIRO
+        if (power [i] >= LIGHT_THRES && triggered [i] == false) {
+          triggered [i] = true;
+          switch (i) {
+            case 0: Keyboard.print ('g'); break;
+            case 1: Keyboard.print ('h'); break;
+            case 2: Keyboard.print ('f'); break;
+            case 3: Keyboard.print ('j'); break;
+          }
+        }
+#else
+        if (power [i] >= HEAVY_THRES && triggered [i] == false) {
+          triggered [i] = true;
+          switch (i) {
+            case 0: Keyboard.print ('t'); break;
+            case 1: Keyboard.print ('y'); break;
+            case 2: Keyboard.print ('r'); break;
+            case 3: Keyboard.print ('u'); break;
+          }
+        } else if (power [i] >= LIGHT_THRES && triggered [i] == false) {
+          triggered [i] = true;
+          switch (i) {
+            case 0: Keyboard.print ('g'); break;
+            case 1: Keyboard.print ('h'); break;
+            case 2: Keyboard.print ('f'); break;
+            case 3: Keyboard.print ('j'); break;
+          }
+        }
+#endif
+        break;
+      } else if (j == POWER_CACHE_LENGTH - 1) {
+        // The power is still increasing
+      }
+    }
+
+// This is the end of each channel
+  }
+  
+  delay (1);
+}
+