Perhaps. I thought about testing one out, especially since I could use one for the vegetable garden anyway. I'll have to figure out which one to get, preferably z-wave.
Wrapping up this thread. Thanks to everyone who contributed. I ended up purchasing an Ecowitt Leaf Wetness Sensor and it has worked great in detecting dew on the grass. After playing around with the placement, angle, and threshold values, I now can say that I am able to reliably detect when there's dew on the grass. And, at least at this time of year, it's a lot more often than I ever knew! The HE integration for the Leaf Wetness Sensor is here.
This sensor has proven much more reliable than other methods that I tried. The easy way was to detect dew presence based on dew point. While that might work theoretically, it did not work well for me in practice, even with an outdoor Ecowitt humidity and temperature sensor.
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