1# Vibrator 2 3### Introduction 4 5This sample simulates the countdown scenario to show the use of the vibrator APIs. Below shows the sample app. 6 7 8 9### Functions 10 11You can trigger a vibrator to vibrate by duration or vibration effect. 12 13### Required Permissions 14 15ohos.permission.VIBRATE 16 17### Usage 18 191. Touch the countdown text. A time picker is displayed. Select any time and touch **OK**. The selected time is displayed as the countdown text. 20 212. Touch **start**. The countdown starts, and the round progress bar and countdown text start changing. When the countdown ends, the device vibrates, the progress bar returns to the initial state, and a vibration dialog box is displayed. 22 233. Touch **reset**. The countdown ends, and the round progress bar and countdown text are restored to the initial state. 24 25### Constraints 26 271. This sample can only be run on standard-system devices. 28 292. This sample requires a device with a vibrator. 30 313. This sample requires DevEco Studio 3.0 Beta4 (Build Version: 3.0.0.992, built on July 14, 2022) to compile and run. 32 33
