1. Product Description

1 This is a simple moisture sensor that can be used to detect soil moisture. When the soil is lacking water, the module outputs a high level, otherwise it outputs a low level. Use this sensor to make an automatic watering device so that the plants in your garden do not need to be managed by humans.
2 Adjustable sensitivity (adjusted by the blue digital potentiometer in the picture)
4 Working voltage 3.3V-5V
5 Module dual output mode, digital output is simple, analog output is more accurate.
6 There are fixing bolt holes for easy installation
7 Small board PCB size: 3cm * 1.6cm
8 Power indicator light (red) and digital switch output indicator light (green)
9 The comparator uses LM393 chip, which works stably

Interface description(4-wire system)

1 VCC external 3.3V-5V
2 GND External GND
3 D0 small board digital output interface(0 and 1)4 A0 small board analog output interface

Instructions

1 The soil humidity module is sensitive to environmental humidity and is generally used to detect soil humidity.

2 When the soil humidity does not reach the set threshold, the module DO port outputs a high level. When the soil humidity exceeds the set threshold, the module D0 outputs a low level;

3 The small board digital output D0 can be directly connected to the microcontroller, and the microcontroller is used to detect high and low levels to detect soil humidity;

4 The small board digital output DO can directly drive the store's relay module, buzzer module, etc., thereby forming a soil humidity alarm device;

5 The small board analog output AO can be connected to the AD module, and through AD conversion, a more accurate value of soil humidity can be obtained;

IV. Shipping List

1. A set of finished soil moisture detection module boards as shown in the figure (including detection board and soil moisture probe)
2. 20cm DuPont wire for easy wiring