Lovelace dashhoard card help

dopecoder · September 10, 2021, 3:38am

I am getting below cell voltage values from my inverter. Displaying entity value in a card on dashboard seems easy. I am not sure how to do any mathematical formula etc using entities. I like to do the following, any help / advice appreciated.

Round the below voltage to 3 decimal
Display the smallest (minimum) value
Display the largest (maximum) value
Display the different of the largest vs smallest (largest - smallest)
i would be displaying 2, 3 and 4 in a separate card.

tom_l · September 10, 2021, 3:57am

You cant do this in Lovelace. You would need to either adjust the value_template in the integration you are using to obtain these readings if it supports one. If it does not you need to make template sensors.

dopecoder · September 10, 2021, 4:18am

i cannot change the entity data i am getting via mqtt, if i have to achieve this in HA how would you advice?

tom_l · September 10, 2021, 4:30am

So they are discovered mqtt sensors, not defined in YAML?

In that case:

dopecoder · September 12, 2021, 7:16am

Thanks Tom,

they are in yaml, example below. Thanks will check the template example.

  - platform: mqtt
    name: "jkbms_VoltageCell01"
    state_topic: "homeassistant/sensor/jkbms_VoltageCell01"
    unit_of_measurement: "V"
  - platform: mqtt
    name: "jkbms_VoltageCell02"
    state_topic: "homeassistant/sensor/jkbms_VoltageCell02"
    unit_of_measurement: "V"

tom_l · September 12, 2021, 7:28am

Can you please format your pasted config correctly as per point 11 here.

dopecoder · September 12, 2021, 7:43am

thanks Tom, updated above

i tried tried rounding within the sensor topic, below obviously didnt works, is there a way to achieve the rounding within the sensor yaml below or will i have to make a template for each of my 16 sensors

thanks

  - platform: mqtt
    name: "jkbms_VoltageCell01"
    state_topic: "homeassistant/sensor/jkbms_VoltageCell01 | float | round(3)"
    unit_of_measurement: "V"

tom_l · September 12, 2021, 7:46am

Like this:

  - platform: mqtt
    name: "jkbms_VoltageCell01"
    state_topic: "homeassistant/sensor/jkbms_VoltageCell01"
    value_template: "{{ value|round(3) }}"
    unit_of_measurement: "V"

dopecoder · September 12, 2021, 8:04am

it worked, thanks

dopecoder · September 12, 2021, 9:40am

I have customized the card by rounding.

I would like to highlight the cell with the highest voltage in this card, either with color, changing icon or some other means. i would like to do the same for the cell with the lowest voltage.

I am looking at how to achieve something similar with templates but i cant get my head around it, any tips / ideas appreciated.

tom_l · September 12, 2021, 9:57am

Not exactly what you are after but this card can sort and colour by state: