4-bit to 1-byte conversion script for DALI, DMX512 etc.

[edgars]

Resident script (sleep interval = 0), which is doing conversion from 4-bit to 1-byte

4-bit dimmer object adress is 1/1/1
1-byte output object adress is 1/1/2

By default, script will change value by 10% every 0.2 seconds when any kind of up/down telegram is received.
 

Code:

dimmer = grp.getvalue('1/1/1')
step = bit.band(dimmer, 0x07)

if step ~= 0 then
 addr = '1/1/2'
  up = bit.band(dimmer, 0x08) ~= 0
  value = grp.getvalue(addr)

  if up then
    newvalue = value + 10
  else
    newvalue = value - 10
  end

  -- clamp between 0 and 100
  newvalue = math.min(newvalue, 100)
  newvalue = math.max(newvalue, 0)

  if newvalue ~= value then
    grp.write(addr, newvalue)
  end
end

os.sleep(0.2)