Watt Meter

lager watt [NET_NAME] [COMMAND] [OPTIONS]

lager watt NET_NAME [--box BOX]                  # power
lager watt NET_NAME current [--box BOX]          # current
lager watt NET_NAME voltage [--box BOX]          # voltage
lager watt NET_NAME all [--box BOX]              # current + voltage + power

Power 'POWER_METER': 52.340 µW
Current 'POWER_METER': 12.000 mA
Voltage 'POWER_METER': 3.300 V

Measurements 'POWER_METER' (0.1s):
  Current: 12.000 mA
  Voltage: 3.300 V
  Power:   39.600 mW

lager watt POWER_METER all --json --box my-lager-box
{"netname": "POWER_METER", "current": 0.012, "voltage": 3.3, "power": 0.0396, "duration_s": 0.1}

lager watt POWER_METER current --duration 1.0 --box my-lager-box

lager watt POWER_METER current --duration 60 --box my-lager-box

lager defaults add --watt-meter-net POWER_METER

lager watt

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

# Read current / voltage (Joulescope JS220 or Nordic PPK2)
lager watt POWER_METER current --box my-lager-box
lager watt POWER_METER voltage --box my-lager-box

# Read current, voltage, and power together
lager watt POWER_METER all --box my-lager-box

# Average over 1 second for a lower-noise reading
lager watt POWER_METER current --duration 1.0 --box my-lager-box

# Machine-readable output for scripts
lager watt POWER_METER all --json --box my-lager-box

# Read using default net
lager watt

# List available watt meter nets
lager watt --box my-lager-box

#!/bin/bash
# Verify power consumption is within limits using JSON output
POWER=$(lager watt POWER all --json --box my-lager-box | python3 -c 'import sys,json; print(json.load(sys.stdin)["power"])')

if (( $(echo "$POWER > 10" | bc -l) )); then
    echo "FAIL: Power consumption too high: ${POWER}W"
    exit 1
fi
echo "PASS: Power within limits (${POWER}W)"

#!/bin/bash
# Sample current over time
BOX="my-lager-box"
NET="POWER"

echo "timestamp,current_a"
for i in $(seq 1 10); do
    CURRENT=$(lager watt $NET current --json --box $BOX | python3 -c 'import sys,json; print(json.load(sys.stdin)["current"])')
    echo "$(date +%s),$CURRENT"
    sleep 1
done