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home-assistant: fix zigbee sensor battery reporting
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WSDCGQ12LM sensors report battery: 0 due to firmware quirk. Override
battery calculation using voltage via homeassistant value_template.

Also adds zigbee_sensor_stale alert for detecting dead sensors regardless
of battery reporting accuracy (1 hour threshold).

Device configuration moved from external devices.yaml to inline NixOS
config for declarative management.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Torjus Håkestad
2026-02-05 22:41:07 +01:00
parent 4d8b94ce83
commit c515a6b4e1
3 changed files with 90 additions and 12 deletions
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38
services/home-assistant/default.nix
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@@ -69,6 +69,44 @@
frontend = true;
permit_join = false;
serial.port = "/dev/ttyUSB0";
# Inline device configuration (replaces devices.yaml)
# This allows declarative management and homeassistant overrides
devices = {
# Temperature sensors with battery fix
# WSDCGQ12LM sensors report battery: 0 due to firmware quirk
# Override battery calculation using voltage (mV): (voltage - 2100) / 9
"0x54ef441000a547bd" = {
friendly_name = "0x54ef441000a547bd";
homeassistant.sensor_battery.value_template = "{{ (((value_json.voltage | float) - 2100) / 9) | round(0) | int | min(100) | max(0) }}";
};
"0x54ef441000a54d3c" = {
friendly_name = "0x54ef441000a54d3c";
homeassistant.sensor_battery.value_template = "{{ (((value_json.voltage | float) - 2100) / 9) | round(0) | int | min(100) | max(0) }}";
};
"0x54ef441000a564b6" = {
friendly_name = "temp_server";
homeassistant.sensor_battery.value_template = "{{ (((value_json.voltage | float) - 2100) / 9) | round(0) | int | min(100) | max(0) }}";
};
# Other sensors
"0x00124b0025495463".friendly_name = "0x00124b0025495463"; # SONOFF temp sensor (battery works)
"0x54ef4410009ac117".friendly_name = "0x54ef4410009ac117"; # Water leak sensor
# Buttons
"0x54ef441000a1f907".friendly_name = "btn_livingroom";
"0x54ef441000a1ee71".friendly_name = "btn_bedroom";
# Philips Hue lights
"0x001788010d1b599a" = {
friendly_name = "0x001788010d1b599a";
transition = 5;
};
"0x001788010d253b99".friendly_name = "0x001788010d253b99";
"0x001788010e371aa4".friendly_name = "0x001788010e371aa4";
"0x001788010dc5f003".friendly_name = "0x001788010dc5f003";
"0x001788010dc35d06".friendly_name = "0x001788010dc35d06";
};
};
};
}

8
services/monitoring/rules.yml
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@@ -226,6 +226,14 @@ groups:
annotations:
summary: "Mosquitto not running on {{ $labels.instance }}"
description: "Mosquitto has been down on {{ $labels.instance }} more than 5 minutes."
- alert: zigbee_sensor_stale
expr: (time() - hass_last_updated_time_seconds{entity=~"sensor\\.(0x[0-9a-f]+|temp_server)_temperature"}) > 3600
for: 5m
labels:
severity: warning
annotations:
summary: "Zigbee sensor {{ $labels.friendly_name }} is stale"
description: "Zigbee temperature sensor {{ $labels.entity }} has not reported data for over 1 hour. The sensor may have a dead battery or connectivity issues."
- name: smartctl_rules
rules:
- alert: smart_critical_warning