This document discusses the development of a system to monitor and control water quality in a rainwater harvesting tank used for agricultural irrigation. The system uses a turbidity sensor connected to a solenoid valve to automatically open the valve when turbidity levels are high, reducing the farmer's burden to manually monitor water quality. The objectives are to develop this system and test that it can accurately detect turbidity levels and open/close the valve as required. The results show the system was successfully developed and tested to meet these objectives.

2. Background of study
 Water is the source of life ( Al-Quran)
 Water is the important factor for the growth,
germination and productivity of the plant (Went,
1949).
 Sustainable in agriculture playing a main role in
the agricultural industry in term of produce high
quality of product without pollutes the
environment.
 The use of rainwater as a source of water for
irrigates the crop is one of the sustainable
agriculture.

3. Problem statement
 Turbidity increases during rainfall or due to flow
changes or disturbances leading to high variations in
turbidity levels (Mylvahanen et al., 1998)
 Irrigating with dirty or turbid water is the potential
heavy metal accumulation in soil and foodstuff
(Battilani et al., 2009).
 Unneeded particular substances on the rooftop and
gutter such as moss, dry leaves and rust that
attached at the rooftop and gutter also will be flow
together to the rainwater harvesting storage tank
during rainfall

4. Objective of study
 To develop a turbidity sensor that has a
connection with solenoid valve in order to
control the quality of water in rainwater
harvesting tank
 To test the functionally for each system
requirement for ensuring the system benefit for
controlling and monitoring the quality of water.

5. Scope
 To assist in monitoring the quality of water in the
rainwater harvesting tank
 To assist in maintenance of rainwater harvesting
tank

6. Methodology
1. Planning
4. Implementation
2. Information
gathering and
requirement
3. Analysis and
design
5. Performance
evaluation

7. System flow design

8. Result
Objective 1 : To develop a turbidity sensor
that has a connection with solenoid valve
in order to control the quality of water in
rainwater harvesting tank

9. Complete circuit of project

10. Prototype of project

11. Result
Objective 2 : To test the functionally for each
system requirement for ensuring the system
benefit for controlling and monitoring the
quality of water.

12. Result of functional testing
Hardware User Percent
Free from Error Error success fails
Turbidity sensor
1. Able to detect turbidity 19 1 95% 5%
Solenoid Valve
1. Able to open and close 19 1 95% 5%

13. Reading of reading of voltage
and nephelometric turbidity unit
Reading before detect
turbid
Reading after detect turbid

14. Conclusion
 The main goal of this system is to control
the quality of water in the rainwater
harvesting tank is suitable for supply to the
crop.
 The objectives of this system is open the
valve of solenoid valve automatically when
turbid level is high and to reduce the burden
of farmer to monitor the quality of water in
rainwater harvesting tank.

15. Recommendation
The system can be improve to make this system
become more advance. For example, this system
can be added with GSM SIM900A or IOT system to
make the system become more advance. By doing
so, the farmer can control and can know how much
the water flow out when the turbid level is high
through the notification via phone. This will enhance
the farmer in term of monitoring the quantity of water
in the rainwater harvesting tank and also can ease
the work to get the data about the condition of water
every time and everywhere without limit.

16. References
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