Soil Sensor Trips wrong way (dry>wet not wet>dry)

[crusher70]

@jkandasa

Hi and thank you for your help with this.

I'm using the default MySensor sketch, the read function is as follows:-
the serial output shows that when the sensor is wet (not triggered) a 1 is sent and Dry (triggered) a 0 is sent.
I have changed the Dampening to none for now.

void loop()     
{     
  // Read digital soil value
  int soilValue = digitalRead(DIGITAL_INPUT_SOIL_SENSOR); // 1 = Not triggered, 0 = In soil with water 
  if (soilValue != lastSoilValue) {
    Serial.println(soilValue);
    gw.send(msg.set(soilValue==0?1:0));  // Send the inverse to gw as tripped should be when no water in soil
  
    lastSoilValue = soilValue;
  }

[jkandasa]

@crusher70

Thank you for the code. Yes, your sensor sends 1 and 0. You have to configure two alarm definitions.

one as you showed here and another one should be like trigger when == 0

[crusher70]

@jkandasa

Thank you jkandasa,
I was looking at it from completely the wrong direction trying to cover everything with just one alarm. I have reconfigured as you suggested and also added a forward payload which turns on a relay to water plants and turns it off when soil is wet.

Working perfectly thank you so much for your help with this.

Glen

[jkandasa]

@crusher70

Perfect! you can also configure one safety alarm for your relay. For example controller turned on relay based on wet, dry signal. Later if we do not receive any data from sensor, relay will be keep on turned ON and water over flow will happened.

To avoid this you can configure one additional alarm for relay. Say turn OFF relay if it's continually ON for more than 20 minutes.
Condition: Realy == 1 and in Dampening: Active time 20 minutes

[crusher70]

@jkandasa
Great idea! Ill do that now. Thanks again for being so helpful.

Glen

[crusher70]

@jkandasa
Ok one final nob question if you don't mind?

I have configured the Alarm as suggested but set the active time for 1 min for testing. The alarm triggers as it should but I cant see where the triggering of this alarm turns off the relay. Sorry if this is a silly question but I can't for the life of me see where to configure it.

Many thanks
Glen

[jkandasa]

@crusher70

Hey, no problem at all. you can ask as many questions you want.

Can you post your configuration screenshot?

[crusher70]

@jkandasa

As requested this is the alarm i have configured.

[jkandasa]

@crusher70

Alarm triggers but there is no notification to execute for this alarm. You have to create new notification with Send payload relay =1. and map your new notification with this alarm.

[crusher70]

@jkandasa

Ah now I understand thank you once again.

Regards
Glen

[crusher70]

@jkandasa

Thanks jkandasa work great. I shall leave you alone to rest up for a while as its 4:30 am over there. I'm sure I'll have more questions at some point in the future, but for now you have been a great help so thank you very much. Take care and have a great day.
Regards
Glen

[jkandasa]

@crusher70 well! Thank you!