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These sensors are suitable for use with 5v or 3.3v Arduino or you can use it with Raspberry Pi. The module comes with Sensor to be inserted into soil and there is one digital Converter provided with sensor to gives the digital out.
You can connect your Microcontroller via 4 pin headers provided on board. The board is capable to provide, Analog as well Digital Output at the Same time. The board is Pre Callibrated, but in case you need to adjust the Sensitivity of the Sensor, you are free to adjust it using the onboard Potentiometer.