Raspberry Pi PLC

This controller was created to control the Robovent dust collection system that is used to control room (atmospheric) pressure for Field Debris Wind Tunnel testing at the John Deere Aero-Thermal Performance Lab. This controller will adjust the Robovent VFD frequency to maintain a pre-determined room pressure. This is needed because as the unit under test begins to plug during debris testing the pressure in the room will increase (from more negative to less negative), assuming a constant Robovent speed, because the wind tunnel cannot replace the air being evacuated from the room as fast as it previously was. As these changes are happening this controller will make the changes necessary on the Robovent to give us more precise and consistent test data.