Detecting NaN sensor (DS18b20) lambda/else

ESPHome
1

Trying to detect when a DS18b20 goes offline or NaN and then execute a LED based on the state

I have referred to this post: https://community.home-assistant.io/t/sensor-nan-value-as-trigger/480230/4?u=domain_int butI really need to add an else in the statement and dont know how to do it

I tried doing this:

      then:
        - if:
            condition:
              lambda: (id(temp_probe_error).state)) == "NaN";
            then:
              - light.turn_on: sensor_check
          else:
            - light.turn_off: sensor_check

tried this

       - lambda:
          if (isnan(id(temp_probe_error).state)) {id(sensor_check).turn_off();} else {id(sensor_check).turn_on();}

and I tried this

  - platform: dallas_temp
    name: ${name}-probe-error
    update_interval: 10s
    id: temp_probe_error
    on_value:
      then:
        - lambda: 
            if (isnan(id(temp_probe_error).state)) {
              id(sensor_check).turn_on();
            } else {
              id(sensor_check).turn_on();
            }

I am a newb when it comes to lambdas but am not afraid to search

The main issue is to do with the else statement

Hope someone can help

2

any help???

3

I tried this too:

  - platform: dallas_temp
    name: temp_probe
    update_interval: 1s
    id: temp1
    filters:
      - skip_initial: 5
      - clamp:
          min_value: 2
          max_value: 90
          ignore_out_of_range: true
      - median:
          window_size: 7
          send_every: 4
          send_first_at: 3       
      - lambda: |-
          if (isnan(x)) {
            return -997;
        } else {
            return x;
          }
4

Bevor
dallas_temp

You have one wire and get the ID from the sensor?

5

Errrrr… would there be something more constructive to contribute behind such an inane reply instead of clocking up your reply count?

6 
    lambda: |-
      int volts = 120;
      if (!(isnan(id(voltage).state))) {
        volts = id(voltage).state;
      }
      return (id(current0).state * volts);

Instead of else, set a base variable.

1 Like