SHAC LUA Script

Good Day all!

need help on writing a LUA script,

a lighting feedback group,

example; cbus lighting gp address 1 to 4.

any of the address 1 to 4, on will trigger [feedback address] gp5 to on and only gp address 1 to 4 is off will trigger gp5 to off.

many thanks in advance.

tried the below but failed, couldn't understand why.

value1 = GetCBusState(0, 56, 1)
value2 = GetCBusState(0, 56, 2)
value3 = GetCBusState(0, 56, 3)
value4 = GetCBusState(0, 56, 4)
state1 = (value1 and value2 and value3 and value4)
state2 = (value1 or value2 or value3 or value4)

if (state1 == false) then
SetCBusState(0, 56, 5, false)
end
if (state2 == true) then
SetCBusState(0, 56, 5, true)
end

 

This line will never become true add logging to your code, i expect this as below would always be nill
state1 = (value1 and value2 and value3 and value4)
log(state1)

So if i read correctly you want you code to operate group 5 after groups 1-4 are all on, then switch group 5 off after any group between 1-4 is off?
This could be achieved using a keyword on group address 1-4 with an event script.

 

@Pie Boy, thanks for the reply.

concept is almost there just, any group between 1 - 4 turn on, will trigger group 5 on and all group between 1 to 4 all off then trigger group 5 to off.

group 5 is like a status/feedback group for monitoring only.

 

Google Lua logical functions. They don't work like you think. They don't return true/false results.
Your 'and' statement will always return value4 and your 'or' statement will always return value1. Both of these will always be 'true' since only 'false' and 'nil' are 'false' . A zero value is 'true'.

 

Boolean functions can be qualified like the below, After some testing this works for me,

value1 = GetCBusState(0, 56, 1)
value2 = GetCBusState(0, 56, 2)
value3 = GetCBusState(0, 56, 3)
value4 = GetCBusState(0, 56, 4)

state1 = value1 and value2 and value3 and value4
state2 = value1 or value2 or value3 or value4

log (state1, state2)

if not state1 then
log('state1 is false')
SetCBusState(0, 56, 5, false)
end

if state2 then
log('state2 is true')
SetCBusState(0, 56, 5, true)
end

 

Yes, my mistake. I misread GetCbusState as GetCbusLevel. GetCbusLevel will be interpreted as true even if the level is zero.

But my comments still stand. The lua AND and OR functions don't work like traditional languages and care is required.

 

@Ashley and Pie Boy,

thanks for your input. greatly appreciate it. manage to understand bit more to LUA, seems like tons of reading and 'writing' need to be done to understand more.

based on Pie Boy input able to work. was wondering if i got more address need to monitor it's simple as adding more of the ''values'' into the ''states''. but will be there a shorter script can accommodate the same function?

 

You could also look at putting the groups into a scene and monitoring the scene.

 

@ Icrowhurst, how to monitor the scene? is it via LUA?

 

Create a scene called GROUPMONITOR and add your groups to it

add the keyword GROUPMONITOR to your groups

then create an event script called GROUPMONITOR with the keyword GROUPMONITOR as the trigger

And put this script in it

state1 = GetSceneMinLevel('GROUPMONITOR')
state2 = GetSceneMaxLevel('GROUPMONITOR')

-- All groups on state1 = 255
-- All groups off state1 = 0

-- One or more groups on state2 = 255
-- All groups off state 2 = 0

log("state2 " .. state2)
log("state1" .. state1)

 

you can also try this

As lcrowhurst suggested tag groups 1-4 with keyword GROUPMONITOR and create an event script called GROUPMONITOR with the keyword GROUPMONITOR and past the below into the event script and save. if there are other groups to monitor then just keep tagging them with keyword GROUPMONITOR

Code:

-- tag groups 1-4 with the keyword GROUPMONITOR

local tagname = 'GROUPMONITOR' -- tagname
for _, obj in ipairs(grp.tag(tagname)) do -- return a table of all objects with tagname GROUPMONITOR and loop through them
  if toboolean(obj.value)==true then -- check if the object value is true -- can change to obj.value > 0 if using values
    log("group "..obj.address.." value "..obj.value) -- log the group and value that is true
    return
      log('an object is true')
  end
  grp.checkwrite('0/56/5', true) -- set group 5 to true -- check write stops multiple writes -- change to 255 if using values
end
log('All objects are false')
grp.checkwrite('0/56/5', false) -- set group 5 to false -- check write stops multiple writes -- change to 0 if using values