Vehicle Navigation

Last Updated on : 2024-06-19 08:27:07download

Background information

In most scenarios, a mobile phone can be clipped to a vehicle bracket to help users navigate cycling routes. However, this method is inconvenient when it is too hot, too cold, or raining, thus affecting the user’s cycling experience. To solve this issue, Tuya allows you to integrate the navigation capabilities of AutoNavi into your vehicle products. This way, navigation data can be transmitted to a meter based on data points (DPs). The meter can thus read and display the navigation data and provide a cost-efficient and optimal navigation experience.

This vehicle navigation solution ensures compatibility with different types of screens, such as segment liquid crystal displays (LCDs), dot-matrix displays, and liquid crystal displays. You can benefit from the price performance brought by the user-friendly navigation feature.

Reference style

Vehicle Navigation

Features

DP configuration

DP name	DP code	Data transfer type	Data type	Description
Navigation data	navigation_data	Send and report (read-write)	String	{‘direction code’,‘distance’,‘road name’,‘remaining time’,‘remaining mileage’,‘navigation status’}

The fields are described as follows:

Direction code: the value of the direction sent by the cloud. For more information, see Appendix 1.
Distance: refers to the remaining distance of this section, in meters.
Road name: refers to the name of the next road section.
Remaining time: the remaining time to reach the destination, in seconds.
Remaining mileage: the remaining mileage to reach the destination, in meters.
Navigation status: send start when the navigation starts and during the navigation process, and send stop at the end of the navigation.``

Example

Start navigation
Start navigation: {0,0,0,0,0,start}

Send the command in the app: 33 03 00 0F 30 2C 302C 30 2C 30 2C 30 2C 73 74 61 72 74

The fields are described as follows:

DP ID (1 byte)	DP type (1 byte)	Data length (2 bytes)	Data
0x33	0x03	0x00 0F	30 2C 30 2C 30 2C 30 2C 30 2C 73 74 61 72 74
DP ID: 51	String type	Data length: 15 bytes	0,0,0,0,0,start

Navigating
Navigating: For example, {3,116,Xiehe Road,365184,1218043,start}

Send the command in the app: 33 03 00 24 33 2C 3131 36 2C E5 8D 8F E5 92 8C E8 B7 AF 2C 33 36 35 31 38 34 2C 31 32 31 38 30 3433 2C 73 74 61 72 74

The fields are described as follows:

DP ID (1 byte)	DP type (1 byte)	Data length (2 bytes)	Data
0x33	0x03	0x00 24	33 03 00 24 33 2C 31 31 36 2C E5 8D 8F E5 92 8C E8 B7 AF 2C 33 36 35 31 38 34 2C 31 32 31 38 30 34 33 2C 73 74 61 72 74
DP ID: 51	String type	Data length: 36 bytes	`3,116,Xiehe Road,365184,1218043,start` means to turn right, after 116 meters, enter Xiehe Road (UTF-8 encoding), the remaining time is 365184 seconds (recommended to convert to: hours:minutes:seconds), the remaining mileage is 1218043 meters (recommended to convert to km if it is more than 1 km, with 1 decimal place), start.

Stop the navigation

Stop the navigation: {0,0,0,0,0,stop}
Send the command in the app: 33 03 00 0E 30 2C 302C 30 2C 30 2C 30 2C 73 74 6F 70

The fields are described as follows:

DP ID (1 byte)	DP type (1 byte)	Data length (2 bytes)	Data
0x33	0x03	0x00 0E	30 2C 30 2C 30 2C 30 2C 30 2C 73 74 6F 70
DP ID: 51	String type	Data length: 14 bytes	0,0,0,0,0,stop

Anomaly description

If the vehicle does not receive a stop command from the app, we recommend that you implement the processing logic on the vehicle. For example, if no data is not received from the app for more than three minutes, the navigation will automatically stop.
If the device is found to get offline, the navigation will automatically stop.

Appendix 1: Parsing of direction codes

Field	Value
Turn left	Value: `2`
Turn right	Value: `3`
Left front	Value: `4`
Right front	Value: `5`
Left back	Value: `6`
Right back	Value: `7`
Take a left U-turn	Value: `8`
Go straight	Value: `9`
Enter the roundabout	Value: `11`
Leave the roundabout	Value: `12`
Reach the destination	Value: `15`
Turn left around the island, move within a roundabout in right-hand traffic, and circulate in an anticlockwise direction	Value: `21`
Turn right around the island, move within a roundabout in right-hand traffic, and circulate in an anticlockwise direction	Value: `22`
Go straight around the island, move within a roundabout in right-hand traffic, and circulate in an anticlockwise direction	Value: `23`
Make a U-turn around the island, move within a roundabout in right-hand traffic, and circulate in an anticlockwise direction	Value: `24`

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