diff --git a/snake/Makefile b/snake_arduino/Makefile
similarity index 73%
rename from snake/Makefile
rename to snake_arduino/Makefile
index b223e2c..a1c0db0 100644
--- a/snake/Makefile
+++ b/snake_arduino/Makefile
@@ -1,5 +1,5 @@
 compile:
-	arduino-cli compile -b arduino:renesas_uno:unor4wifi snake.ino
+	arduino-cli compile -b arduino:renesas_uno:unor4wifi ./snake_arduino.ino
 
 upload:
 	arduino-cli upload -b arduino:renesas_uno:unor4wifi -p /dev/ttyACM0
diff --git a/snake/snake.ino b/snake_arduino/snake_arduino.ino
similarity index 91%
rename from snake/snake.ino
rename to snake_arduino/snake_arduino.ino
index 373949a..d5ba812 100644
--- a/snake/snake.ino
+++ b/snake_arduino/snake_arduino.ino
@@ -36,6 +36,14 @@ void setup() {
   Serial.begin(115200);
   // stard LED matrix
   matrix.begin();
+  // btn up
+  pinMode(13, INPUT);
+  // btn right
+  pinMode(12, INPUT);
+  // btn bottom
+  pinMode(11, INPUT);
+  // btn left
+  pinMode(10, INPUT);
 }
 
 void move_snake() {
@@ -83,6 +91,9 @@ void move_snake() {
   frame[snake_y[0]][snake_x[0]]= 1;
 }
 
+void change_direction() {
+}
+
 void loop() {
   matrix.renderBitmap(frame, 8, 12);
   delay(300);