This experiment demonstrates the effectiveness of the GP2 and the new DeltaLINK software in implementing a successful PID controller based irrigation system. The soil moisture and solar radiation data collected and processed shows that the PID controller responds appropriately to the diurnal cycle – enabling us to investigate the relationship between solar radiation and water use. The sophisticated internal processing involved in this experiment demonstrates the potential for the GP2 logger and controller to be used successfully in a wide variety of complex and challenging real world applications. 
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