custom 1Pcs For arduino development board soil moisture detection module hygrometer humidity sensor DIY robot smart car

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A description of the
 What is a simple water sensor can be used to detect soil moisture when the module generates soil moisture deficit a high level, and vice versa low output. Use this sensor produced an automatic plant watering device, so that the plants in your garden without the people to manage.
2 adjustable sensitivity adjustment of the digital blue potentiometer (Figure)
Operating voltage 4 3.3V-5 v-
Module dual output mode, the digital output is simple, more accurate analog output.
A fixed through hole for easy installation
7 small boards, PCB size: 3 cm * 1.6 cm
8 power indicator (red) and digital switching output indicator (green)
9 LM393 comparator chip, stable

Two small interface board description (4-wire)
1 external VDC 3.3 v-5 v
2 External GND GND
3 MAKE small digital output interface board (0 and 1)
4 AO small analog output interface cards

Three instructions for use

Soil moisture module is more sensitive to ambient humidity is generally used to detect soil moisture content.

2 module in the soil moisture less than a threshold value set when the DO port high output, when the when the soil moisture exceeds the threshold value is set, the module D0 low output;

D0 3 small digital output boards can be connected directly with the microcontroller, microcontroller to detect high and low, and so to detect soil moisture;

4 small digital output boards of the store relay module can directly trigger the buzzer module, and which can form a ground moisture alarm equipment;

5 small analog outputs sa and AD modules connected through the AD converter, you can get more precise values of soil moisture;