Purpose -The purpose of this paper is to develop a robotic system to feed aquatic organisms and measure water physicochemical parameters in experimental aquaculture ponds. Design/methodology/approach -A dispatcher unit dispenses a precise amount of food and control panel software schedules the tasks and operates the robot. In the control panel, the feeding and measuring schedule is defined and sent to the mobile robot and the amount of food is requested by the robot to the dispatcher for each pond. The robot travels automatically on a monorail to dispense the food and measure the water parameters. The data are transmitted to the control panel. The system can be remotely operated over the internet through a client-server software framework. Findings -The robotic system is a tool for delegating feeding and measuring tasks. This allows researchers and technicians time to focus on more substantive aquacultural research tasks. Research limitations/implications -Future improvement will include an automatic unit for cleaning sensors between ponds to minimize the risk of cross-contamination. Practical implications -The system systematized feeding and measuring tasks, minimized human error, and optimized the use of resources for aquacultural experimentation. The robotic system can be programmed for a variety of experimental conditions, such as the delivery of different diets at diverse schedules. Originality/value -The proposed robot was tested for feeding freshwater redclaw crayfish (Cherax quadricarinatus) and monitored the water parameters in real time. Based on the field results, the robotic system provided a reliable and robust device for aquacultural research applications.
Over the last years the evolution of microprocessor technology with the consequent availability of reliable, high performance, low cost digital hardware and powerful software tools and the prospective of growing difficulties in the maintenance of analog apparatus, has led many manufacturers to develop new digital AVRs. Many benefits are expected from the use of microprocessors as wider flexibility, improvements in control performance and autodiagnostics, richer information for the local and remote operator. To exploit these advantages ENEL, the Italian Electricity Company, encouraged the Italian electro-mechanical manufacturers to develop a new generation of digital A V R The paper, after a brief glance over the general problems and advantages deriving from the use of microprocessor technology, gives an overview of the most technical aspects to be envisaged in the design of digital AVR and shows the differences in the approach and the novelties coming out with respect to the traditional analogue solution. It deepens design aspects regarding the hardware and software architecture, the reliability and the safety, the operator interface, the factors affecting the dynamic response and the criteria for evaluating the dynamic alteration. An example of the new advanced digital AVR is presented in details.
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