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Power Management

STICKER is engineered for ultra-low power operation to enable multi-year field deployments without external power supplies. It is powered by 2× standard AA batteries (1.5 V alkaline or lithium cells).

NFC Provisioning & Radio Activation

Device parameters, keys, and radio-mode activation are managed wirelessly using an NFC-enabled smartphone running HARDWARIO Manager — even before batteries are installed.

Battery Architecture & Power Monitoring​

  • Operating Voltage: Powered by 2× AA batteries with a wide input voltage range of 1.8 V to 3.6 V.
  • Ultra-Low Idle Current: Achieves an idle sleep consumption of < 80 µA using Zephyr RTOS deep-sleep states on the STM32WL SoC.
  • Dynamic Voltage Measurement: Battery voltage is sampled under load during active sensor sampling and radio transmission cycles, ensuring accurate telemetry and triggering Low-Battery Alarms on fPort 3.

Factory Default: Radio-Silent Mode (v1.4.0+)​

Starting with firmware v1.4.0, STICKER ships from the factory in Radio-Silent Mode (radio-mode disabled):

  • Zero Transmission in Transit: The LoRaWAN transceiver remains completely inactive out of the box to prevent battery drain from un-gatewayed Join attempts during shipping or storage.
  • Field Activation: Radio transmission (radio-mode on) is enabled on-site during commissioning by tapping the unit with HARDWARIO Manager over NFC or via shell commands (config radio-mode on).

NFC Energy Harvesting (Battery-Less Configuration)​

  • Passive Configuration: The integrated NFC tag interface allows full device provisioning without batteries inserted or when batteries are depleted.
  • RF Energy Harvesting: The RF field generated by a smartphone running HARDWARIO Manager supplies sufficient power to write parameters directly to the onboard NFC tag EEPROM.
  • Boot Validation: When batteries are inserted, STICKER boots, validates pending configuration stored in the NFC EEPROM, applies parameters, and initializes normal operation.