Map proximity to servo

ESPHome
1

I have set up a servo in esphome, according to the docs, to hopefully display the distance my wife is from home, using proximity. The servo has an annoying range where the movement of the servo is mapped (0= 60) and (180 = -100), so kind of backwards to what’s logical.

What I need is some type of equation that converts the distance from proximity, where 0 metres is minimum and 2000 metres is maximum and convert those values to 60 and -100.

So:
0 metres = 60%
2000 metres = -100%

Is there any way to make an automation template that makes this conversion? The answers I have found where way beyond me.

Here’s my automation:

- alias: Push Wife Distance to Display
  trigger:
    - platform: state
      entity_id:
        - proximity.wife_home
  action:
    - service: esphome.distance_display_control_distance_servo
      data_template:
        level: '{{ trigger.to_state.state | int}}'

Here’s my espHome config:

esphome:
  name: distance_display
  platform: ESP8266
  board: d1_mini
  on_boot:
    priority: 800
    then:
      - servo.write:
          id: distance_servo
          level: 60%
      - delay: 1s
      - servo.write:
          id: distance_servo
          level: -100%

# Enable Home Assistant API
api:
  services:
    - service: control_distance_servo
      variables:
        level: float
      then:
        - servo.write:
            id: distance_servo
            level: !lambda 'return level / 100.0;'
ota:

output:
  - platform: esp8266_pwm
    id: servoPin
    pin: D6
    frequency: 50 Hz

servo:
  - id: distance_servo
    output: servoPin
    min_level: 3.0% 
    idle_level: 7.5%
    max_level: 12.0%

Any ideas would be greatly appreciated.

2

So I’m not sure why, but this kind of works:

(60-states.proximity.wife_home.state | int/12)
3

Why? It is pretty simple maths problem, a linear graph from 2 points.

The correct answer is 12.5 not 12.

4

Thank you for that, I stand corrected : )