50pcsLM393 soil the hygrometer detection module soil moisture sensor Robot smart car

Disclaimer: 1 This is a summary of the moisture sensor can be used to detect the moisture of the soil, when the soil is dry , the module outputs a high level , whereas the output low. Using this sensor make an automatic watering system , so that your garden plants need people to manage . 2 adjustable sensitivity ( shown in blue digital potentiometer adjustment ) 4 Operating Voltage 3.3V-5V 5 Module Dual Output mode , a simple digital output , analog output more accurate. 6 with fixed bolt hole for easy installation 7 small PCB board size : 3cm * 1.6cm 8 power indicator ( red ) and the digital switch output indicator ( green ) 9 using LM393 comparator chip , stable VCC external 3.3V-5V GND GND External DO small board digital output interfaces ( 0 and 1 ) AO small board analog output interface Instructions A soil moisture and humidity module most sensitive to the environment , usually used to detect soil moisture . Modules in the soil moisture reach the set threshold , DO port output high when soil moisture exceeds a set threshold, the module D0 output low ; Digital outputs D0 small plates can be directly connected with the microcontroller through the microcontroller to detect high and low , thereby detecting soil moisture ; Small plates digital output DO OUR relay module can directly drive the buzzer module , which can be composed of a soil moisture alarm equipment ; Small plates AO analog output modules can be connected and AD through the AD converter , you can get a more accurate value of soil moisture ;