Barometric Pressure Card (Home Assistant)

A Lovelace custom card that displays barometric pressure with an optional dual-scale gauge (hPa + inHg), trend, low/normal/high bands, and a simple forecast (Zambretti-inspired). Includes i18n (EN/CZ) and a built-in GUI editor.

Features

• Pressure value (display unit can be auto, hPa, kPa, mmHg, inHg)
• Optional MSL normalization (sea-level pressure) using HA elevation, optionally temperature-adjusted
• Trend: rising / falling / steady (uses entity attribute if available, otherwise local delta tracking)
• Level classification: low / normal / high based on configurable thresholds
• Gauge:
  • dual mode (outer inHg + inner hPa) with dual sync (inHg ring derived from hPa min/max)
  • hPa-only or inHg-only modes
  • smart outer label placement and optional range arcs
• Forecast chip:
  • zambretti (simplified) or simple heuristic
  • optional wind direction influence when wind_entity is provided

Installation

HACS (recommended)

1. HACS → Frontend → Custom repositories
2. Add your GitHub repo URL and select Lovelace
3. Install Barometric Pressure Card
4. Reload resources (or restart Home Assistant)

Add the resource:

• Settings → Dashboards → Resources → Add resource
• URL: /hacsfiles/barometric-pressure-card/barometric-pressure-card.js
• Type: JavaScript Module

Manual

1. Copy barometric-pressure-card.js to:
   • /config/www/barometric-pressure-card.js
2. Add the resource:

• URL: /local/barometric-pressure-card.js
• Type: JavaScript Module

Usage

Minimal

type: custom:barometric-pressure-card
entity: sensor.pressure

Typical example (dual gauge + forecast)

type: custom:barometric-pressure-card
name: Barometric Pressure
entity: sensor.outdoor_pressure
unit: auto
decimals: 1

normalize_msl: true
temperature_entity: sensor.outdoor_temperature

gauge_scale: dual
dual_sync: true

low_hpa: 1005
high_hpa: 1025

forecast_mode: zambretti
wind_entity: sensor.wind_bearing
hemisphere: north
season_mode: auto

Configuration

Core

Key	Type	Default	Description
entity	string	required	Pressure sensor entity.
name	string	—	Card title (falls back to entity friendly name).
unit	string	auto	Display unit: auto, hPa, kPa, mmHg, inHg.
decimals	number	1	Decimal places for the displayed value.
lang	string	auto	auto, cs, en.
show_trend	boolean	true	Show trend chip.
trend_threshold_hpa	number	0.4	Threshold used for derived trend when no trend attribute is present.

MSL normalization

Key	Type	Default	Description
normalize_msl	boolean	true	Convert station pressure to sea-level pressure using HA elevation.
temperature_entity	string	—	Optional temperature entity for temperature-adjusted SLP.

Thresholds (low/high level)

You can define thresholds either in hPa or inHg.

Key	Type	Default	Description
threshold_unit	string	auto	auto, hpa, inhg.
low_hpa / high_hpa	number	1005 / 1025	Thresholds in hPa (MSL).
low_inhg / high_inhg	number	—	Thresholds in inHg (MSL). If used, they are converted to hPa internally.
show_level	boolean	true	Show level chip (low/normal/high).

Gauge

Key	Type	Default	Description
show_gauge	boolean	true	Show gauge.
gauge_scale	string	dual	dual, hpa, inhg.
dual_sync	boolean	true	In dual mode, derive inHg ring min/max from hPa min/max.
gauge_start_deg	number	-120	Gauge start angle.
gauge_sweep_deg	number	240	Gauge sweep angle.
gauge_width / gauge_height	number	320 / 210	Rendered SVG size.
gauge_offset_x / gauge_offset_y	number	0 / 0	Shift gauge inside the SVG canvas.
inhg_label_offset / hpa_label_offset	number	12 / 12	Label offsets for outer/inner scales.
scale_hpa_min / scale_hpa_max	number	980 / 1040	hPa mapping range.
scale_hpa_major / scale_hpa_minor	number	10 / 2	hPa major/minor step.
scale_inhg_min / scale_inhg_max	number	28 / 31	inHg mapping range (used when not dual-synced).
scale_inhg_major / scale_inhg_minor	number	0.5 / 0.1	inHg major/minor step.
contrast_mode	string	auto	auto, dark, light for ticks/needle contrast.
show_range_arcs	boolean	true	Show LOW/NORMAL/HIGH arcs.
range_arc_width	number	8	Arc thickness.

Forecast

Key	Type	Default	Description
show_forecast	boolean	true	Show forecast chip.
forecast_mode	string	zambretti	zambretti or simple.
wind_entity	string	—	Optional wind direction entity (affects zambretti category).
hemisphere	string	north	north or south.
season_mode	string	auto	auto, summer, winter.

Notes

• In dual gauge mode, the needle mapping is anchored to hPa so both rings align perfectly.
• If the pressure sensor does not provide a trend attribute, the card stores the last pressure in localStorage and computes trend from the delta.

Changelog

• v1.9.1
  • Fix: template handler typo
  • Dual mode: robust needle mapping anchored to hPa
  • Thresholds: definable in hPa or inHg, plus threshold_unit
  • Improved outer labels and dual ring sync