Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si Material: metal Net Weight: 7g : -28 Main Color: blue Operating voltage: 3.3V~5V Dual output mode,analog output more A fixed hole for easy installation With indicator (red) and digital switching output indicator (green) Having LM393 comparator chip, stable Panel PCB Dimension: Approx.3cm x 1.5cm Soil Probe Dimension: Approx. 6cm x 3cm Cable Length: Approx.21cm Interface Description(4-wire): VCC: 3.3V-5V GND: GND DO: digital output interface(0 and 1) AO: analog output interface Instructions for : Soil moisture module is sensitive to the ambient humidity is generally used to detect the moisture content of the soil Module to reach the value is set in the soil moisture, DO port output high, when the the soil humidity exceeds a set value, the module D0 output low The digital output D0 can be connected directly with the microcontroller to detect high and low by the microcontroller to detect soil moisture The digital outputs DO shop relay module can directly drive the buzzer module, which can form a soil moisture alarm equipment Analog output AO and AD module connected through the AD converter, you can get more precise values of soil moisture Package Content: 1 x Soil Hygrometer Detection Module Note: Random color, 't accept the specified color. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.