I am currently trying to build a basic soil moisture sensor that will trigger IFTTT to alert me when the soil gets to a certain level of dryness. I’v got a variable resistor linked up to an LED and I managed to get it working via arduino.
Now the main challenge I’m facing is to alert me straight away, then another alert an hour later, then a final alert the next day.
You can use Particle.publish to send an event notification to the Particle server. Then you can set IFTTT to monitor for that event and check its value. I would only publish the event when the notification to you should be triggered from IFTTT. I have a setup working for this that monitors dry contact inputs on one of our products and it works quite well. If you have any questions let me know.