DIY Electronic Kit for Soil Moisture LED Light Soil …, Mackay

Description When the probe is inserted into the soil if the soil is dry the resistance at the two poles of the probe is very high and the base of V1 is at the low level V1 and the LED1 LED2 and LED3 are in the off state When the soil humidity increases gradually the resistance at the two poles of the probe gradually decreases and V1 begins to conduct After the current is limited by resistor R1 the LED 1 is lit At this time because the circuit of LED 2 is connected with diode VD1 it needs to be driven by higher voltage Similarly LED3 is also connected in series Only with the humidity gradually increasing the number of LED lights can light up more Specifications Product name Soil moisture sensorProduct size 26 48MMWorking voltage DC5VPackage Include 1 Electronic KitThis is an unassembled kit you will need to assemble and solder it