This is a LM2596 based regulator module that provide all the active functions for a step-down (buck) switching regulator and is capable of driving a 3-A load with excellent line and load regulation. This feature greatly simplifies the design of switch-mode power supplies.

This is Soil Moisture Meter, Soil Humidity Sensor, Water Sensor, Soil Hygrometer for Ardunio. With this module, you can tell when your plants need watering by how moist the soil is in your pot, garden, or yard. The two probes on the sensor act as variable resistors. Use it in a home automated watering system, hook it up to IoT, or just use it to find out when your plant needs a little love. Installing this sensor and its PCB will have you on your way to growing a green thumb