Energy-Efficient Distance Estimation Solutions; Configure The Module For Low Power Consumption - We PROTEUS-III User Manual

WIRELESS CONNECTIVITY & SENSORS
User manual Proteus-III
Receiving multiple CMD_BEACON_IND
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Deactivate scanning on module B,
CMD_SCANSTOP_REQ
Response CMD_SCANSTOP_CNF
Reset module A (disable sending beacons),
CMD_RESET_REQ
Response CMD_RESET_CNF
Response CMD_GETSTATE_CNF
5.8. Energy-efficient distance estimation solutions
The transmitted advertising packet contains its TX power value. This value in combination with
the RSSI value of the received advertising packet can be used to estimate the distance between
the modules. Using a suitable triangulation algorithm and multiple receivers or transmitters, a
position can be approximately determined.
The advertising packets can be received by performing a passive scan that will not request the
scan response. Thus only one frame, instead of three frames, is transmitted per advertising
interval.
Besides the FS_BTMAC of the sending module, the RSSI value and the TX power is output in
format of a CMD_RSSI_IND message when an advertising packet of another Proteus-III has been
received.
To enable this function, the corresponding value in the user setting RF_BeaconFlags has to be
set.
5.9. Configure the module for low power consumption
Depending on the application environment of the Proteus-III, the goal is to find the optimal
trade-off between the module's performance and its power consumption. Therefore, the main
settings and operation modes that affect the current consumption are listed below:
• CMD_SLEEP_REQ : This command puts the module into ACTION_SLEEP mode, where it con-
sumes the lowest current (<1µA). In this case, both the UART and the Bluetooth
interface are shut down.
• CMD_UARTDISABLE_REQ : This command disables the UART interface. It is enabled again
as soon as the module is reset/woken or when the module outputs a message e.g. when
a connection request has been received or the WAKE_UP pin of the module was used.
• RF_TXPower : This setting can be used to configure the output power of the module. Re-
ducing the output power saves energy.
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