Watt Meter

Read power consumption from watt meter

Read power consumption measurements from watt meter Nets through the Lager CLI.

Syntax

lager watt [OPTIONS] NET_NAME

Options

Option	Description
--box BOX	Lagerbox name or IP address
--help	Show help message and exit

Arguments

Argument	Description
NET_NAME	Name of the watt meter net to read

Usage

lager watt NET_NAME [--box BOX]

Arguments:

• NET_NAME - Name of the watt meter net. Can be omitted if a default is set.

Examples:

# Read power from watt meter
lager watt POWER_METER --box my-lager-box

# Read using default net
lager watt

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Setting Default Net

To avoid specifying the net name each time:

lager defaults add --watt-net POWER_METER

Then you can simply run:

lager watt

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Output

Returns the power measurement in watts (W).

Power: 5.23 W

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Supported Hardware

Manufacturer	Model	Features
Yocto	Watt modules	Real-time power measurement

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Use Cases

Power Profiling

Monitor device power consumption during different operating modes:

# Measure idle power
lager watt POWER --box gateway

# Measure active power (during operation)
lager watt POWER --box gateway

Battery Life Estimation

Combine with other measurements:

# Get power consumption
lager watt POWER

# Calculate estimated battery life
# Battery capacity (mAh) / Current draw (mA) = Hours

Automated Testing

Integrate power measurement into test scripts:

#!/bin/bash
# Verify power consumption is within limits

POWER=$(lager watt POWER --box gateway)
if [ "$POWER" -gt "10" ]; then
    echo "FAIL: Power consumption too high"
    exit 1
fi
echo "PASS: Power within limits"

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Notes

• Power is returned in watts (W)
• Net names refer to names assigned when setting up your testbed
• Use lager nets to see available watt meter nets
• For high-precision measurements, ensure proper calibration of the watt meter