INTERNATIONAL JOURNAL OF ENERGY AND ENVIRONMENT Imam Al-Kadhum College (IKC) Conference on Applications of Engineering Techniques in Renewable Energy and Environment (AETREE), Najaf, Iraq, 5 th May 2019. Journal homepage: www.IJEE.IEEFoundation.org ISSN 2076-2895 (Print), ISSN 2076-2909 (Online) ©2019 International Energy & Environment Foundation. All rights reserved. Design and construction of smart IoT-based aquaponics powered by PV cells Baraa Abd Al-Zahraa Naser, Aajam Laith Saleem, Ali Hilal Ali, Salam Alabassi, Maher A.R. Sadiq Al-Baghdadi Department of Electronic and Communications Engineering, Faculty of Engineering, University of Kufa, Iraq. Abstract An aquaponic is a system that combines aquaculture with hydroponic to form a bio-integrated structure that aims at achieving a symbiotic environment for both aqualife and crops growth. Fish excretions in fish tanks contains ammonia which is poisonous and is considered very dangerous on fish survival. However, ammonia can be converted by the action of the nitrifying bacteria into Nitrites and then to Nitrates which can be used as nutrients for the plants, hence the symbiotic relationship between the two. The aim of this project is to monitor and control aquaponics by using Internet of Things (IoT) technology by recording various parameters in real time settings. Our proposed system consists of sensors that measure pH, temperature, Oxygen and ammonia levels. In turn, these sensors are connected to a remote database over the internet to enable users to get the values of these sensors. We used NodeMcu to acquire sensors data and deliver them to a web server. The low power consumption of the system has resulted in the possibility of powering it by solar power. We have registered levels of ammonia without the action of aquaculture part between 0.05 to 0.4 mg/L over a period of one week. These values have since risen to a dangerous level of 0.5mg/L leading fish deaths. However, a stable range of 0.02 to 0.04 mg/L were registered with the integration of the aquaculture part. In addition, a normal pH level of 6.5 to 8 were recorded and the temperature was between (23-25.57) C°. these results are considered acceptable for a healthy growth of both aqualife and hydroplants. Keywords: Aquaponics; Internet of things; NodeMcu; Environmental parameters. 1. Introduction Aquaponics is a term used to describe a system that combines aquaculture and hydroponics operating in a symbiotic relationship. An aquaculture is considered more suitable option than traditional agriculture in cases where both space and water, among other resources, are limiting factors [1]. The shared water resource between the plants and fish could achieve an optimum environment for the nourishment of both parties while keeping water consumption at minimum. Ammonia is a by-product of fish, which although very poisonous to fish, is converted by the nitrifying bacteria into Nitrites and then to Nitrates. Nitrates can be used as nutrients for plants. However, aquaponics requires continuous monitoring and the presence of man-power should the balance between the two environment is lost. This could result in a higher operation cost than traditional agriculture. Nevertheless, in this research, we proposed IoT, to