Soil moisture meter it is a simple water sensor can be used to detect soil moisture when the soil moisture deficit module outputs a high level, and vice versa output low
Use this sensor produced an automatic plant waterer device, so that the plants in your garden without people to manage adjustable sensitivity blue digital potentiometer adjustment (figure)
Operating voltage 33v-5v module dual output mode, the digital output is simple, more accurate analog output a fixed bolt hole for easy installation
Power indicator (red) and digital switching output indicator (green) comparator lm393 chip, stable