Nov 21, 2015 Arduino Environment sensors. Temp, Humidity, Plant water. Here's my plant water/moisture sensing arduinos unos. They're DHT11, 2 nails in a potplant, and 433MHz transmitters. This one lives in the kitchen, monitoring the basil. Written by: Brenda Wallace Wellington, Whanganui a Tara Brenda does many things. Lately it's mostly typing softwares, and soldering gadgets.