diff --git a/app/src/main/cpp/native-lib.cpp b/app/src/main/cpp/native-lib.cpp
index ed200d8..70755e9 100644
--- a/app/src/main/cpp/native-lib.cpp
+++ b/app/src/main/cpp/native-lib.cpp
@@ -623,13 +623,7 @@ int serial_port_comm()
     return 0;
 }
 #endif
-extern "C" JNIEXPORT jstring JNICALL
-Java_com_xinyingpower_testcomm_MainActivity_stringFromJNI(
-        JNIEnv* env,
-        jobject /* this */) {
-    std::string hello = "Hello from C++";
-    return env->NewStringUTF(hello.c_str());
-}
+
 
 extern "C" JNIEXPORT jstring JNICALL
 Java_com_xinyingpower_testcomm_MainActivity_testSpi(
@@ -748,6 +742,13 @@ Java_com_xinyingpower_testcomm_MainActivity_testSpi(
     return env->NewStringUTF(result.c_str());
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_xinyingpower_testcomm_MainActivity_setInt(
+        JNIEnv* env,
+        jobject /*this*/, jint cmd, jint val) {
+    setInt(cmd, val);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_xinyingpower_testcomm_MainActivity_turnOn(
         JNIEnv* env,
diff --git a/app/src/main/java/com/xinyingpower/testcomm/MainActivity.java b/app/src/main/java/com/xinyingpower/testcomm/MainActivity.java
index a39cecd..04a09eb 100644
--- a/app/src/main/java/com/xinyingpower/testcomm/MainActivity.java
+++ b/app/src/main/java/com/xinyingpower/testcomm/MainActivity.java
@@ -5,6 +5,7 @@ import androidx.appcompat.app.AppCompatActivity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.view.View;
+import android.widget.Button;
 import android.widget.TextView;
 
 import com.xinyingpower.testcomm.databinding.ActivityMainBinding;
@@ -23,6 +24,12 @@ public class MainActivity extends AppCompatActivity {
         public void onClick(View view) {
             int viewId = view.getId();
             switch (viewId) {
+                case R.id.turnOn12V:
+                    turnOn12V(view);
+                    break;
+                case R.id.turnOn485:
+                    turnOn485(view);
+                    break;
                 case R.id.turnOn:
                     turnOn();
                     break;
@@ -106,25 +113,36 @@ public class MainActivity extends AppCompatActivity {
             }
         });
 
+        int viewIds[] = {R.id.turnOn, R.id.turnOff, R.id.turnLeft, R.id.turnRight, R.id.turnUp, R.id.turnDown,
+            R.id.turnOn12V, R.id.turnOn485, R.id.turnOnWipers, R.id.turnOffWipers, R.id.turnOnLight, R.id.turnOffLight,
+            R.id.setSpeed, R.id.setPreset, R.id.gotoPreset};
+        for (int viewId : viewIds) {
+            Button btn = (Button)findViewById(viewId);
+            btn.setOnClickListener(onButtonClicked);
+        }
+
         Handler handler = new Handler();
         Runnable runnable = new Runnable() {
             @Override
             public void run() {
-                binding.btnSpi.performClick();
+                // binding.btnSpi.performClick();
             }
         };
         handler.postDelayed(runnable, 1000);
     }
 
+    private void turnOn12V(View view) {
+        setInt(133, 1);
+    }
 
-    /**
-     * A native method that is implemented by the 'testcomm' native library,
-     * which is packaged with this application.
-     */
-    public native String stringFromJNI();
+    private void turnOn485(View view) {
+        setInt(131, 1);
+    }
 
     public native String testSpi(int port);
 
+    public native void setInt(int cmd, int val);
+
     public native void turnLeft();
     public native void turnRight();
     public native void turnUp();
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index d87417f..694d8aa 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -26,6 +26,24 @@
 
     </EditText>
 
+    <Button
+        android:id="@+id/turnOn12V"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="8dp"
+        android:text="12V"
+        app:layout_constraintLeft_toRightOf="@id/edtPort"
+        app:layout_constraintTop_toTopOf="@+id/btnSpi" />
+
+    <Button
+        android:id="@+id/turnOn485"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="8dp"
+        android:text="485"
+        app:layout_constraintLeft_toRightOf="@id/turnOn12V"
+        app:layout_constraintTop_toTopOf="@+id/btnSpi" />
+
     <Button
         android:id="@+id/turnOn"
         android:layout_width="wrap_content"