*Smart Rainwater Harvesting System for Sustainable Agricultural Irrigation and Drainage System DOI: http://dx.doi.org/10.5772/intechopen.104442*

content and it is very easy to use [6]. Only insert this robust sensor into the soil to be checked, and the volumetric water content of the soil is recorded as a percentage (%). **Table 3** and **Figure 4** show the specification of the Soil Moisture Sensor, as well as the sensor image.

## *4.2.2 Arduino UNO*

Arduino is a microcontroller board which is open-source hardware. The term "UNO" in Italian means "ONE" and was chosen to mark the initial release of Arduino Software. The Uno board is the first in a series of Arduino UNO board based on USBArduino Uno has 14 digital pins, six analog pins, a USB interface, an ICSP header, a power barrel port, and a reset button. This Arduino UNO is used after upload coding to store data, and the project can fully function with a power supply without being connected to a laptop or computer. **Table 4** shows the technical specification of this board. **Figure 5** shows the Arduino UNO board.


#### **Table 4.**

*Arduino UNO technical specification.*

**Figure 5.** *Arduino UNO board.*
