Power Supply

Products can be powered by different sources: mains (230V), battery (3V), rechargeable batteries, solar panel, or micro-generator (Energy Harvesting)

Mains Power Supply

Attention

Chapter not yet documented.

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Battery Management

Battery or rechargeable battery powered products can provide low battery information based on a threshold stored in the product. Several levels and thresholds are defined:

  • BT_MESH_BATTERY_INDICATOR_GOOD, (The battery charge is Good Level), level >= 10% (green)

  • BT_MESH_BATTERY_INDICATOR_CRITICALLY_LOW, (The battery charge is Critically Low Level), 5% < level < 10% orange)

  • BT_MESH_BATTERY_INDICATOR_LOW, (The battery charge is Low Level), level <= 5% (red)

  • BT_MESH_BATTERY_INDICATOR_UNKNOWN, (The battery charge is unknown)

Requirement: Battery measurement is done once at startup then every hour

Requirement: The percentage is calculated based on a discharge curve specific to each battery type

Requirement: During provisioning on the App, the product indicates its battery level

Requirement: The backend stores and provides the battery level (if the product is in a home with a gateway)

When low battery is detected:

  • the product publishes a Mesh alert every hour, indicated on the App and IoTHub. A push notification is also triggered.

Requirement: The percentage is published on the Generic Battery Server mesh model (status) at SAADC measurement

Requirement: alert thresholds generating a Health fault message (1h period)

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Energy Harvesting Products

Products powered by micro-generator (Energy Harvesting, EH, or “wireless/batteryless”), mainly switches, communicate with other products using Bluetooth Low Energy.

Their power is only generated during user action (pressing or releasing a button). This power is fleeting and limited and only allows sending information (usually a press/release status or sensor data) within range of the product that can receive the data.

They have specific installation and configuration compared to Bluetooth Mesh.

Requirement: EH switches must be within radio range of the products they control

Requirement: the maximum number of EH switches that can be bound per product is currently limited to 5.

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