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3.3V-5V Soil Moisture Sensor£¬ Hygrometer Detection Module
A baby description 1 This is a simple moisture sensor that can be used to detect soil moisture when the soil is in water£¬ the module outputs a high level£¬ whereas the output is low. Use this sensor to make an automatic watering device£¬ so that your garden plants do not have to manage. 2 Sensitivity adjustable (blue digital potentiometer adjustment) 4 Working voltage 3.3V-5V 5 Module dual output mode£¬ digital output is simple£¬ analog output more accurate. 6 With a fixed bolt hole£¬ easy to install 7 Small PCB Size: 3cm * 1.6cm 8 Power indicator (red) and digital switch output indicator (green) 9 Comparator with LM393 chip£¬ stable operation Two-board interface description (4-wire) 1 VCC External 3.3V-5V 2 GND External GND 3 DO small board digital output interface (0 and 1) 4 AO small board analog output interface Three instructions 1 soil moisture module is most sensitive to environmental humidity£¬ generally used to detect soil moisture. 2 module in the soil moisture can not reach the set threshold£¬ DO port output high level£¬ when the soil humidity exceeds the set threshold£¬ the module D0 output low; 3 small board digital output D0 can be directly connected with the microcontroller£¬ through the microcontroller to detect high and low levels£¬ which to detect soil moisture; 4 small board digital output DO can directly drive our relay module£¬ buzzer module£¬ etc.£¬ which can form a soil moisture alarm equipment; 5 small board analog output AO can be connected with the AD module£¬ through the AD conversion£¬ you can get more accurate soil moisture values;