ENG305 Project 1Aeroponic Irrigation System

James, Chris, Ewan

IntroductionMoeller PLC• EASY719-DC-RC• Programmable Control

Device• Ladder Logic

Aeroponic Irrigation System • Misting System suited to

Australian conditions

Pros• Lower water consumption• Doesn’t rely on soil qualityCons• Complex

Figure 1:.Moeller EASY719-DC-RC [1]

Figure 2: Aeroponics System [2]

Objectives Broad Objectives• Practical scenario• Use as many features as possible• Integrate Moeller• Robust/Scalable

Key Objectives• Meaningful simulated results

ConceptionKey system operations identified:Root aerationVentilationTemperature ControlNutrient MaintenanceSprinkler Head Monitoring

System

Note:• Temperature sensor• Nutrient supply

System Operation

SimulationSystem Components• Simulated using available

equipment

Time Scale• Based on 24 hour cycle• Simulation time much faster than

real time• Times chosen based on physical

operations

System Time• Day/Night time tracked

Simulation Time Real Time

1 hour 10 seconds

12 minutes 2 seconds

30 minutes 5 seconds

24 hours 4 minutes

Item Simulation

Sprinkler spray Light

Analog sensors Potentiometer

Vent control Pneumatic cylinder

Operation Sim. Time

Heating cycle 12 minutes

Air pump cycle 30 minutes

30 minutes 5 seconds

24 hours 4 minutes

Wiring

Control BoxConception• Simplify simulation set-up• Self-contained controls

and alerts

Internal Configuration • DIN Rail• Relays

Construction and Wiring• Wired to be easily

integrated with Moeller PLC

Testing• System tested prior,

mostly errors in translation to control box

ProgrammingApproach Variable mapping first “Modular” development Separation of processes

Structured Flow Preventing double-triggering, event collision Memory bits as states, universal access Simultaneous operations

Documentation Everything named Extensive comments

ResultsTesting• Success in terms of objectives

All Inputs and Outputs UsedMoeller Integrated with numerous pieces of

hardwareProgram Robust/ScalableSimulated adequately in terms of key

objectives

DiscussionKey Design Issues• Wiring• Programming

Future Improvements• Using PCB’s• Software Improvement• Stress Tests

Conclusions about Application of Moeller • In terms of Simulated outcomes, Moeller useful for

application

References [1] Klockner Moeller, ‘EASY719-DC-RC’, 2013. [Online]. Available: http

://www.klocknermoeller.com/easy700/easy719-dc-rc.htm. [Accessed: 06-Apr-2015]. [2] HowToGrowMarijuana.com, ‘Aeroponics – Grow Systems’, 2014. [Online]. Available: http

://howtogrowmarijuana.com/aeroponics/. [Accessed: 06-Apr-2015].