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Hello Prelude, you could probably do this using the kwhinc to kwhd input processor as this is a daily suming of individual posts type processor.

The hourly dial would be a feature to add to the to do list, that will involve quite a bit of coding :)

Hello,

I had a similar Problem.

I have a power meter (Ferraris Counter) and a gas meter which gives me counts (375 incs / kWh and 100 incs / m3).

Wanted to have incs to Power.

So i added some code in ..../emoncms3/Models/process_model.php:

At "function get_process_list()" i added:

  $list[20] = array(
    _("Wh_inc to Power"),
    ProcessArg::FEEDID,
    "wh_inc_to_power",
    1,
    DataType::REALTIME
  );
 

And added an new function:

//---------------------------------------------------------------------------------------
// Wh_inc to Power
//---------------------------------------------------------------------------------------

function wh_inc_to_power($feedid, $time_now, $value)
{
  $new_kwh = 0;

  // Get last value
  $last = get_feed_timevalue($feedid);
  $last_kwh = $last['value'];
  $last_time = strtotime($last['time']);

  if ($last_time)
  {
    // Power calculation
    $time_elapsed = ($time_now - $last_time);
    $kwh_inc = ($value * 3.6 / $time_elapsed);
    $new_kwh = $kwh_inc;
  }

  insert_feed_data($feedid, $time_now, $time_now, $new_kwh);

  return $value;
}
 

I hope its really so easy like i thougt.

When i send "......json={power:2.666}" i get the correct Power for every puls.

The 2.666 comes from 1000W / 375 incs per kWh.

Hope that helps!

Thomas

Hi all,

this function has not yet been implemented in current emoncms version, am I right?

I'm not very familiar with php, so I would prefer perform such operations in the perl script that reads the data from serial port? is this a good idea?

Thanks

Filippo

No the function is not part of the standard emoncms build.

The standard equipment uses arduino code (C) on the base stations or 

php on the server. If you know perl you will find that php is similar.

so if you are running your own emoncms have a go!