Trailing average for an sensor channel

gistfile1.lua

fuel2Id = addChannel("Fuel2", 25, 2, 0,10,"%")
--change this to make a bigger averaging window
--300 = 10 seconds averaging at 30Hz tick rate
maxAvg = 300 
fuelAvg={}
fuel2Index = 1

function updateFuel2(value)
  local i
  if #fuelAvg == 0 then
    --initialize averaging table
    for i = 1, maxAvg do fuelAvg[i]=0 end
  end
  fuelAvg[fuel2Index] = value
  fuel2Index = fuel2Index + 1
  if fuel2Index > maxAvg then fuel2Index = 1 end
  local sum = 0
  for i = 1, #fuelAvg do
    sum = sum + fuelAvg[i]
  end
  setChannel(fuel2Id, sum / maxAvg)
end


setTickRate(30)
function onTick()
  --replace getImu(2) with getAnalog(0)
  updateFuel2(getImu(2))
end