Battery Service

Last Updated on : 2024-06-04 09:43:19download

This topic describes the commands for the battery service.

Query battery level (0x71 25)

The MCU sends the following data.

Field	Bytes	Description
Header	2	0x55aa
Version	1	0x03
Command	1	0x71
Data length	2	0x0001
Data	1	Subcommand: `0x25`
Checksum	1	Start from the header, add up all the bytes, and then divide the sum by 256 to get the remainder.

The module returns the following data.

Field	Bytes	Description
Header	2	0x55aa
Version	1	0x00
Command	1	0x71
Data length	2	0x0002
Data	2	Subcommand: `0x25` Battery level: 0 to 100
Checksum	1	Start from the header, add up all the bytes, and then divide the sum by 256 to get the remainder.

The MCU sends the following data.

Field	Bytes	Description
Header	2	0x55aa
Version	1	0x03
Command	1	0x71
Data length	2	0x0001
Data	1	Subcommand: `0x26`
Checksum	1	Start from the header, add up all the bytes, and then divide the sum by 256 to get the remainder.

The module returns the following data.

Field	Bytes	Description
Header	2	0x55aa
Version	1	0x00
Command	1	0x71
Data length	2	0x0002
Data	2	Subcommand: `0x26` Charging state: `0`: Initial state. When the device starts up, no charging state is detected. `1`: Start charging. `2`: Charging is finished. `3`: Battery is low. `4`: Battery is extremely low. `5`: Battery is unplugged. `6`: Charger is unplugged. `7`: Charging fault occurs.
Checksum	1	Start from the header, add up all the bytes, and then divide the sum by 256 to get the remainder.