Find shortest distance between phone and coordinates

Configuration
1

hi

I’m trying to find the shortest distance with name between phone and GPS locations. I have enabled phone location and tried below code but the result is unknown. Can someone help?

{% set locations = {
  "San Francisco": (5.169231175822279, 76.50155407099898),
  "Los Angeles": (5.169135339347688, 76.50266904873067),

} %}

{% set phone_lat = state_attr('device_tracker.iphone', 'latitude') %}
{% set phone_lon = state_attr('device_tracker.iphone', 'longitude') %}

{% if phone_lat is not none and phone_lon is not none %}
  {% set min_dist = 9999 %}
  {% set closest_location = "Unknown" %}

  {% for name, coords in locations.items() %}
    {% set dist = distance(phone_lat, phone_lon, coords[0], coords[1]) %}
    {% if dist < min_dist %}
      {% set min_dist = dist %}
      {% set closest_location = name %}
    {% endif %}
  {% endfor %}

  Closest Location: {{ closest_location }}
{% else %}
  "Unknown"
{% endif %}
2

You need to use a namespace to extract the value from the loop.

{% set locations = {
  "San Francisco": (5.169231175822279, 76.50155407099898),
  "Los Angeles": (5.169135339347688, 76.50266904873067)
} %}

{% set phone_lat = state_attr('device_tracker.iphone', 'latitude') %}
{% set phone_lon = state_attr('device_tracker.iphone', 'longitude') %}
{% if phone_lat is not none and phone_lon is not none %}
  {% set min_dist = 9999 %}
  {% set ns = namespace(closest_location="Unknown") %}
  
  {% for name, coords in locations.items() %}
    {% set dist = distance(phone_lat, phone_lon, coords[0], coords[1]) %}
    {% if dist < min_dist %}
      {% set min_dist = dist %}
      {% set ns.closest_location = name %}
    {% endif %}
  {% endfor %}

  Closest Location: {{ ns.closest_location }}
{% else %}
  "Unknown"
{% endif %}

FWIW, you can use the device_tracker entity ID directly as the first arg for distance() instead of extracting the lat and long.

3

This is Ok in the Developer Tool template but still shows unknown when the sensor is set. Any idea? I have cleared browser cache but the issue still persists.

4

A state value of “unknown” can often be caused by a minor configuration error. Please share the full sensor configuration.

5 
- sensor:
      - name: "f_shortest_distance"
        unit_of_measurement: "Km"
        state: > 
          {% set phone_lat = state_attr('device_tracker.iphone', 'latitude') %}
          {% set phone_lon = state_attr('device_tracker.iphone', 'longitude') %}

          {% if phone_lat is not none and phone_lon is not none %}
            {% set phone_lat = phone_lat %}
            {% set phone_lon = phone_lon %}

            {% set locations = [
              {'name': 'San Francisco', 'coords': (37.7749, -122.4194)},
              {'name': 'Los Angeles', 'coords': (34.0522, -118.2437)},
              {'name': 'Las Vegas', 'coords': (36.1699, -115.1398)}
            ] %}

            {% set ns = namespace(shortest_distance=none, shortest_location="Unknown") %}

            {% for location in locations %}
              {% set dist = distance(phone_lat, phone_lon, location.coords[0], location.coords[1]) %}
              {% if ns.shortest_distance is none or dist < ns.shortest_distance %}
                {% set ns.shortest_distance = dist %}
                {% set ns.shortest_location = location.name %}
              {% endif %}
            {% endfor %}
            
            {{ ns.shortest_location }}: {{ ns.shortest_distance | round(2) }} km
          {% else %}
            Unknown
          {% endif %}
7

You need to get rid of the unit of measurement. Sensor’s with a defined unit_of_measurement must return a numeric value… your template will always return a string like “Las Vegas: 3010.1 km”.

1 Like
8

And that error should be visible in the log.