Input slider to HEX MQTT message

Configuration
1

I want to set up an input slider who’s value is used in an MQTT message.

Slider will have 0-255 positions
And this need to control the last 2 characters of the payload

Payload needs to be 000000XX where XX is a value from 00 - FF taken from the slider.

I can set up the slider and can send the mqtt message with a fixed payload.

Can anyone help to link the slider to the payload in the correct format.

2

Does this help:

3

Thanks for the info.

Tried using the template tool but can’t create a valid script.

Can anyone offer more detail.

4

You dont put scripts in the template tool. It’s for evaluating templates only.

If you put this in the template editor what do you get as the result:

{% set value = states.input_number.your_input_number.state | int %}
{{ "%+0x" | format( value | int }}
5

Think you are missing a ) after int in 5he second line.

This give me the hex for the slider value with a leading + (ie +FF)

How can I amend this to give 6 leading 0s insted of + (ie 000000FF)

This could then be used to pass to the mqtt message.

6

Oops, yes sorry about the missing bracket. There’s probably an easier way to do it but this should format it how you want

{% set value = states.input_number.your_input_number.state | int %}
{{ "%+0x" | format( value ) | int }}
{{ value | replace("+", "000000") }}
7

) is still in the wrong place need to be after the int or the result is 0

{% set value = states.input_number.your_input_number.state | int %} 
{{ "%+0x" | format( value  | int )}}

The last line

{{ value | replace("+", "000000") }}

does not work the returned result is back to 255. ( or whatever the original value was)

Wandering if value needs converting to a string first before doing the replace but don’t know if this is right or how to do it.

Help so far is great while i try to learn the basics of templates.

8

Hopefully this should work:

payload template: "000000{{ "%0x" | format( states.input_number.your_input_number.state | int ) | string }}"
9

Using this give me an error when checking the config file.

Configuration invalid CHECK CONFIG

Error loading /config/configuration.yaml: while scanning for the next token found character ‘%’ that cannot start any token in “/config/automations.yaml”, line 1173, column 36

Sorry for all the questions but definitely a noob when it comes to value templates and trying to learn by example

10 
payload template

Should be

payload_template
11

I did spot that one.

Tried both ways but configuration check still give the same error.

12

Tried running this in the templates dev tool and it does output as i need.

Just can’t make it work in the payload_template

13

Solved it

I have changed the double quotation marks around the %0x to singles and it now works

working line reads as

payload template: "000000{{ '%0x' | format( states.input_number.your_input_number.state | int ) | string }}"

Thanks for the help to get me to this point.

14

Well done. Glad you got it sorted. Yeah sorry, that’s a rule I forgot to follow (single quotes inside double quotes).