Description

This is Waveshare Moisture Sensor.
The sensor to determine the moisture level of the soil. It is?powered with the voltage from 3.1 V to 5 V. The output is the analog voltage?which increases its value along with the increasing moisture content?which makes it compatible with most commissioning?modules, for example, Arduino. The device can be used, for example, for measuring the moisture content of the soil in the pot.
The sensor has an analog output that should be connected to the pin of the A/D converter (analog input in Arduino). This will allow you to measure the proportional voltage signal and at the same time to determine the level of soil moisture.
Operating principle:
This module is an application of the current amplification by a transistor. When the water in the soil is sufficient enough to conduct the current between the base and the positive power supply, a certain amount of current is generated between the base and the emitter. And in a mean while, an electric current is produced in a certain amplification factor between the collector and the emitter, and applied to the resistant in the emitter to produce a voltage. Then, this voltage will be collected by an AD converter.
Application:

Auto watering system
Flowerpot soil moisture detection
Auto pouring system

Features:?

Auto watering system
Flowerpot soil moisture detection
Auto pouring system
VCC ?? 2.0V ~ 5.0V
GND ?? power supply ground
AOUT ?? MCU.IO (analog output)

Package Includes:
1 x Moisture Sensor
1 x 3-pin custom connector jumper wire