# Green Care Achievement Based on Aquaponics Combined with Human-Computer Interaction
## 3 The Proposed System
### Smart Green Care System (SGCS)
In this study, we set up a fish tank using cultivation water filtered by an aquaponics cycle. No additional filtration system is required, and an IoT water level sensor is used to automatically replenish water to minimize the cost of manual maintenance and to avoid the death of farmed fish due to human errors. * Fishpond: The main function of fishpond is aquaculture; the proposed system integrates the cultivation of Wu Guo fish and Nile fish. During the breeding process, breeding waste and fish excrement will be produced, which can be used to provide nutrients in the water. However, excessive amounts of excrement will affect the quality of cultivation water and cause ecological disasters for fish and crops. Therefore, we will pump the water from the fishpond into the precipitation bucket to filter large impurities. * Precipitation bucket: Through the cultivation water drawn from the fishpond, we will use large brushes to filter the breeding waste and excrement. The fine impurities that cannot be filtered are filtered twice by sedimentation. At this stage, a large amount of waste that affects poor water quality will be removed, and the cultivation water will be sent to the filter bucket for detailed filtering. * Filter Buckets: This area is mainly used to filter finer feeding waste and exceta. Therefore, we use filter cotton and biochemical cotton for filtering. At this stage, the cultivation water will still contain small impurities, so it will be sent to the nitrification pond for digestive decomposition. * Nitrification bucket: In this study, a large number of cultivation rings, biochemical balls, and K1 filter materials will be deployed in the nitrification bucket (please refer to Figure 7), and an air pump will be used to pump air to enable rolling of the cultivation ring, biochemical ball, and K1 filter material. Nitrifying bacteria will be cultivated during the rolling process. Micro-impurities in the cultivation water can be digested and decomposed by the nitrifying bacteria. This process will aid in the cultivation of plants, and the air pump will increase the oxygen content in the cultivation water. In addition to helping fish to breathe, it can also prevent the roots of plants from rotting. * Pipe farming area: We will build a system of hydroponic plumbing area, which can be built vertically to save space. After precipitation, filtration, and nitrification, the cultivation water contains a considerable amount of nitrogen and oxygen, which will aid in plant nutrient absorption and hydroponic cultivation. * Hydroponic area: The hydroponic area is cultivated in the same way as the pipe farming area but can provide a larger area of cultivation, which is more conducive to root growth. * Medium area: We will build a medium planting area for the system because all plants are suitable for hydroponic cultivation, and medium can replace soil with the same effect without affecting cultivation water quality. Therefore, we will use volcanic rocks and foaming stones (please refer to Figure 8), sawdust, water moss, or coconut fibers as growth media. This area must allow the water level to produce a tidal effect, so
additional siphons must be added, which will aid in the respiration of plants and promote plant growth. * Catchment area: The main function of the catchment area is to collect the cultivation water. The siphon device through the nitrification bucket and the medium area will collect the cultivation water into this area, which can also serve as a precipitation purification area. Water can be replenished from this area, and the cultivation water can be sent to the fishpond and the planting area to form a water circulation system to ensure effective use of water resources.