UM2071 datasheet(34/56 Pages) STMICROELECTRONICS

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BlueNRG-1 sensor profile demo

UM2071

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DocID029370 Rev 3

BlueNRG-1 sensor profile demo

The BlueNRG-1 sensor profile demo is supported on the BlueNRG-1 development platform

(STEVAL-IDB007V1). It implements a proprietary, Bluetooth low energy (BLE) sensor

profile.

This example is useful for building new profiles and applications that use the BlueNRG-1

SoC. The GATT profile is not compliant with any existing specifications as the purpose of

this project is to simply demonstrate how to implement a given profile.

This profile exposes the acceleration and environmental services.

Figure 20: "BlueNRG-1 sensor demo GATT database" shows the whole GATT database,

including the GATT (0x1801) and GAP (0x1800) services that are automatically added by

the stack.

The acceleration service’s free fall characteristic cannot be read or written, but can be

signaled. The application sends notification of this characteristic (with a value of 0x01) if a

free fall condition is detected by the MEMS sensor (when the acceleration on the three

axes is near zero for a certain amount of time). Notifications can be enabled or disabled by

writing the associated client characteristic configuration descriptor.

The other characteristic exposed by the service gives the current value of the acceleration

measured by the accelerometer in six bytes. Each byte pair contains the acceleration on

one of the three axes. The values are given in mg. This characteristic is readable and can

be notified if notifications are enabled.

Another service is defined, which contains characteristics that expose data from some

environmental sensors: temperature and pressure. Each characteristic data type is

described in a format descriptor. All of the characteristics have read-only properties.

Figure 20: BlueNRG-1 sensor demo GATT database

UM2071 Datasheet(PDF) 34 Page - STMicroelectronics