@startuml

hide footbox

participant "Key pressed" as kp
participant "Timer" as t

box "500ms" #LightBlue
participant "Light Measurement" as lm
participant "Brightness Function" as bc
participant "Ramp target \nvalue update" as ru
end box

box "25ms" #LightGreen
participant "Current ramp value \ncalculation with hysteresis" as rc
participant "Light driver duty cycle \nupdate with Gamma Correction" as ld
end box

kp -> lm : turn on backlight
lm -> bc : measurement
bc -> ru : brightness \nvalue
ru -> rc : ramp target
rc -> ld : current ramp \nvalue
kp -> t  : start timer

alt timeout
t -> t : turn off backlight
end

@enduml