# Smart Device Control

This page introduces the method of accessing the edge computing platform based on a custom protocol from end devices and interacting with the cloud. Using a scenario of controlling a light switch with gestures as an example, the overall implementation process is explained.

## Preparation

- Edge node, for node access requirements, refer to
  [Edge Node Access Requirements](../user-guide/node/join-rqmt.md)
- LED light with a control unit
- LED light driver mapper, for mapper development, refer to
  [How to Develop Device Driver Application Mapper](./develop-device-mapper.md)

## Create End Devices

1. Deploy the LED light driver mapper to the edge node, the deployment process can be found in
   [Creating Workloads](../user-guide/edge-app/create-app.md)

1. Go to the edge unit details page, select the left menu __Edge Resources__ -> __End Devices__ ,
   and click the __Create Device__ button on the top right of the end device list.

    ![click button](../images/create-device-01.png)

1. Fill in the basic information.

    ![fill info](../images/device-control-01.png)

    !!! note

        The access protocol must be consistent with the protocol name defined in the mapper.

1. Fill in the device configuration, add device twin properties and tags.

    - The property value is the expected value of the device.
    - The access method must be consistent with the key-value data defined in the mapper.

    ![fill info](../images/device-control-03.png)

1. Fill in the device access configuration.

    The access parameters for the platform to connect to the device. In this scenario, the device access path is /dev/ttyACM0, with a baud rate of 9600.

    ![access config](../images/device-control-04.png)

1. Information confirmation, verify that the configured information is correct,
   click __OK__ to complete the device creation.

## Verify Effect

1. In the device list, click the device name to enter the device details page
   and view the reported status values of the device.

    ![device details](../images/device-control-05.png)

2. Edit the device twin properties, modify the expected value of the device,
   and see the change in the LED light status.