diff --git a/main.ts b/main.ts
index 23902bc..b6e3060 100644
--- a/main.ts
+++ b/main.ts
@@ -67,6 +67,7 @@ namespace neZha {
                 iic_buffer[2] = speed;
                 iic_buffer[3] = 0;
                 pins.i2cWriteBuffer(neZha_address, iic_buffer);
+                basic.pause(10)
                 pins.i2cWriteBuffer(neZha_address, iic_buffer);
                 break;
             case MotorList.M2:
@@ -81,6 +82,7 @@ namespace neZha {
                 iic_buffer[2] = speed;
                 iic_buffer[3] = 0;
                 pins.i2cWriteBuffer(neZha_address, iic_buffer);
+                basic.pause(10)
                 pins.i2cWriteBuffer(neZha_address, iic_buffer);
                 break;
             case MotorList.M3:
@@ -95,6 +97,7 @@ namespace neZha {
                 iic_buffer[2] = speed;
                 iic_buffer[3] = 0;
                 pins.i2cWriteBuffer(neZha_address, iic_buffer);
+                basic.pause(10)
                 pins.i2cWriteBuffer(neZha_address, iic_buffer);
                 break;
             case MotorList.M4:
@@ -109,6 +112,7 @@ namespace neZha {
                 iic_buffer[2] = speed;
                 iic_buffer[3] = 0;
                 pins.i2cWriteBuffer(neZha_address, iic_buffer);
+                basic.pause(10)
                 pins.i2cWriteBuffer(neZha_address, iic_buffer);
                 break;
             default:
diff --git a/pxt.json b/pxt.json
index 547cf9a..0c62e25 100644
--- a/pxt.json
+++ b/pxt.json
@@ -16,7 +16,7 @@
     ],
     "public": false,
     "targetVersions": {
-        "target": "4.0.11",
+        "target": "4.0.18",
         "targetId": "microbit"
     },
     "supportedTargets": [