Allow switch on TV after entering correct PIN from LM2 visualization | Logic Machine platform for KNX/EIB, EnOcean, Modbus, DALI, BacNet

Example: Allow switch on TV after entering correct PIN from LM2 visualization

Task

On the logic Machine 2 visualization add PIN number icons, objects attached to these icons. Create program allowing to switch on TV on group address 2/2/2 only if the PIN code is entered correctly

Add KNX objects

Add 4 objects which will be attached to PIN number, 1 object for Enter button and 1 object for Clear button.

Add visualization icons

Create visualization map

Choose from the list added KNX object and respective visualization icon and add them to the map.

Event-based program for each PIN number

Create for each group address of PIN numbers Event-based script – 4 scripts together

In the scripting editor add the following source (change 1 to respective PIN button number)

Source code

pindigit(event, 1)

Function PINDIGIT

Add the following program to User Function Library located in Scripting –> Tools.

Source code

function pindigit(event, digit)
  -- get input value
  local value = dpt.decode(event.datahex, dt.bool)
  -- false received, do nothing
  if not value then
    return
  end
 
  -- add digit to pin
  local pin = storage.get('pin', '')
  storage.set('pin', pin .. tostring(digit))
 
  -- reset digit status
  grp.write(event.dst, false, dt.bool)
end

CLEAR button script

By pressing CLEAR button, you delete the previously entered PIN in the variable.

Source code

local value = dpt.decode(event.datahex, dt.bool)
if value then
  storage.set('pin', '')
  grp.write(event.dst, false, dt.bool)
end

ENTER button script

If the entered PIN code is 1234, then switch on group address 2/2/2

Source code

local value = dpt.decode(event.datahex, dt.bool)
if value then
  -- get current pin
  local pin = storage.get('pin', '')
 
  -- verify pin number
  if pin == '1234' then
     grp.write('2/2/2', 1)
  end
 
  -- reset pin
  storage.set('pin', '')
  grp.write(event.dst, false, dt.bool)
end