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uMesh - Power Management

This document describes the three power profiles available in uMesh v1.3.0.

Modes

UMESH_POWER_ACTIVE: radio always on.
UMESH_POWER_LIGHT: periodic sleep/listen duty cycle.
UMESH_POWER_DEEP: long sleep between telemetry wakeups.

LIGHT mode

Default profile:

Sleep interval: 1000 ms
Listen window: 100 ms

Approximate average current:

Active 100 ms @ 60 mA
Sleep 900 ms @ 2 mA
Average ~= 7.8 mA

DEEP mode

Default profile:

Active phase: 500 ms
Deep sleep interval: 30000 ms

Approximate average current:

Active 500 ms @ 80 mA
Sleep 29500 ms @ 0.01 mA
Average ~= 1.3 mA

Deep mode is intended for end nodes using gradient routing.

Battery life estimate

Given battery capacity C_mAh and average current I_mA:

battery_hours = C_mAh / I_mA

Example:

2000 mAh battery
8 mA average (LIGHT mode)
battery life ~= 250 hours

Recommendations

Coordinator: ACTIVE
Router: ACTIVE
End node (frequent telemetry): LIGHT
End node (sparse telemetry): DEEP + gradient routing