IFTTT isn’t very reliable and makes a poor alternative to direct integration. For one thing, triggers do not always work and even when they do they are often delayed. The most IFTTT could do is turn a zone or the system on or off. If it had direct moisture sensor integration then whatever zone or zones are deemed most important or sensitive could have one and the real moisture level could be integrated instead of estimated. Although the estimation formula you use is very sophisticated it is far from accurate. Even when you put in the correct soil type there are times where it will show the soil as wet based on conditions when the soil is dry. I have verified with mine, measure the water output of the system for each zone, done multiple tests for soil type, checked my soil type for my region which matched as well, verified weather data, and even installed my own weather station to get more direct readings and there are still times where it wrongly assumes my soil is still moist. Moisture sensor integration could help alleviate this and also reduce the complications of adjusting the parameters to get a fuzzy estimation of soil moisture. Overall making it simpler for the end user.
