var myImports = new JavaImporter(java.lang, java.util);

with(myImports) {
  var humidity_threshold = 78.4;
  var on_time = 10; // seconds
  humidity = mcApi.uidTag().getByUid("uid-humidity").getResource();
  humidifier = mcApi.uidTag().getByUid("uid-humidifier").getResource();

  if(parseFloat(humidity.value) < humidity_threshold){
    humidifier.value = "1";
    mcApi.sensor().sendPayload(humidifier); // sensd state
    Thread.sleep(on_time * 1000);
    humidifier.value = "0";
    mcApi.sensor().sendPayload(humidifier); // sensd state
  }
}

Thank you!

I will convert this script to JavaScript by tomorrow and post here.

and the UDIs are there

Reason I use Python is because its the language I'm most comfortable with. But i'll do as you say if you pleas can convert the code to JavaScript to get me started.

Much appreciated.
/goran

Do you have installed python script engine? By default, MyController does not have python script engine as it is eating more resource. I would recommend going with JavaScript(built-in, lightweight).

Refer this link to install python script engine support.

If you want, I can convert this script to JavaScript

Sorry to disturb but I get the following error when i try to manually run the script.

{
"errorMessage": "AttributeError: 'org.mycontroller.standalone.db.tables.UidTag' object has no attribute 'getResource' in <script> at line number 3"
}

Sure I don't have to import mcAPI to python or something?

I have created the UDItags

Regards
Goran

Note: do not forget to create UID tags for humidity and humidifier.

import time

humidity = mcApi.uidTag().getByUid("uid-humidity").getResource();
humidifier = mcApi.uidTag().getByUid("uid-humidifier").getResource();

humidity_threshold = 78.4
on_time = 10 # seconds

if(float(humidity.value) < humidity_threshold):
  humidifier.value = "1";
  mcApi.sensor().sendPayload(humidifier); # sensd state
  time.sleep(on_time)
  humidifier.value = "0";
  mcApi.sensor().sendPayload(humidifier); # sensd state

Think I have to use two UDItag for humidity sensor and relay state.
Then use one variable with two keys. on time and off time.

Humidity control in a greenhouse is difficult that's why i want to use variables to easily be able to adjust on and off intervals.

Kindest regards
Goran

Regards
Goran