1-wire DS18B20 change resolution

[gjniewenhuijse]

something like this?

resident script every 60 seconds:

Code:

-- better to save the last 5 readings and avg them and then write to bus
require('ow')
require('user.nit_measurements')

-- second argument temperature10 (10-bit value)
-- third argument will force a new conversion
readValue = ow.readfile('28.690E0A070000', 'temperature', true)

-- measure last 5 readings
mValue = measValue (5, readValue)
log (round(mValue,1))

user_library nit_measurement:

Code:

avgMax = 5

function measValue (iMax,iValue)
  -- init value array
  if not measCount then
    if iMax then
      avgMax = iMax
    end
      measCount = 0
    measValues = {}
      for i=1,avgMax do
        measValues[i] = iValue
      end
  end
  measCount = measCount + 1

  -- set values
  for i=avgMax,2,-1 do
    measValues[i] = measValues[i-1]
  end
  measValues[1] = iValue

  --log(measValues)
  
  -- reset counter
  if (measCount == avgMax) then
    measCount = 0
  end
  
  rValue = 0
  for i=1,avgMax do
    rValue = rValue + measValues[i]
  end
  rValue = rValue / avgMax
  return rValue
end