RGB relative dimming from KNX

[alexll]

Use this event script for 4-bit object. Change R/G/B addresses as needed and modify step and delay to change the dimming speed and smoothness.

Code:

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114

raddr = '32/1/1' -- red value address gaddr = '32/1/2' -- green value address baddr = '32/1/3' -- blue value address step = 0.05 -- step side delay = 0.3 -- delay between steps value = event.getvalue() up = bit.band(value, 0x08) == 0x08 stop = bit.band(value, 0x07) == 0 if stop then   return  end -- get value and convert from 0..100 to 0..255 r = grp.getvalue(raddr) * 2.55 g = grp.getvalue(gaddr) * 2.55 b = grp.getvalue(baddr) * 2.55 function rgbtohsv(r, g, b)   local max, min, d, h, s, v   max = math.max(r, g, b)   min = math.min(r, g, b)   d = max - min   s = max == 0 and 0 or (d / max)   v = max / 255   if max == min then     h = 0   elseif max == r then     h = (g - b) + d * (g < b and 6 or 0)     h = h / (6 * d)   elseif max == g then     h = (b - r) + d * 2     h = h / (6 * d)   elseif max == b then     h = (r - g) + d * 4     h = h / (6 * d)   end   return h, s, v end function hsvtorgb(h, s, v)   local r, g, b, i, f, p, q, t, z   i = math.floor(h * 6)   f = h * 6 - i   p = v * (1 - s)   q = v * (1 - f * s)   t = v * (1 - (1 - f) * s)   z = i % 6   if z == 0 then     r = v     g = t     b = p   elseif z == 1 then     r = q     g = v     b = p   elseif z == 2 then     r = p     g = v     b = t   elseif z == 3 then     r = p     g = q     b = v   elseif z == 4 then     r = t     g = p     b = v   elseif z == 5 then     r = v     g = p     b = q   end   r = math.round(r * 255)   g = math.round(g * 255)   b = math.round(b * 255)   return r, g, b end function rgbstep(r, g, b, up, step)   local h, s, v = rgbtohsv(r, g, b)   local v2 = up and math.min(1, v + step) or math.max(0, v - step)     if v == v2 then     return   end   return hsvtorgb(h, s, v2) end while true do   r, g, b = rgbstep(r, g, b, up, step)   if r then     grp.write(raddr, r, dt.uint8)     grp.write(gaddr, g, dt.uint8)     grp.write(baddr, b, dt.uint8)   else     break   end   os.sleep(delay)   newvalue = grp.getvalue(event.dst)   if value ~= newvalue then     break   end end

Awesome! Thank you very much!!