Logging & Filtering

mrsaliwood

I am trying to maximize my on-board data storage by filtering the GPIO data.   I have tried to use both threshold and delta filters, but the device continues to log all data points, even when I set an impossible threshold value (nothing should pass through).   Any suggestions? 

SETUP:

MetaTracker

iPhone 6s

microphone gpio  (gpio)   

(In DeviceConfiguration.swift) 

cryingEvent = device.gpio?.pins.first?.analogAbsolute?.periodicRead(withPeriod: 10) 

(In viewController.swift)

//configuration.cryingEvent.change(ofEventAcrossThreshold: 0.7, hysteresis: 0, output: .absolute)

configuration.cryingEvent.changeOfEvent(byDelta: 3.0, output: .absolute) 

configuration.cryingEvent.startLoggingAsync() 

Eric

Your code only logs output from cryingEvent, not the outputs of its filters.  Call startLoggingAsync on the returned MBLFilter pointers.

mrsaliwood

Okay that makes sense.  Now when I make the following assignment: 

modifiedCryingEvent = configuration.cryingEvent.changeOfEvent(byDelta: -3.0, output: .absolute)

        modifiedCryingEvent.startLoggingAsync()

I get the error: 

"Cannot assign value of type 'MBLFilter<AnyObject>' to type 'MBLEvent<MBLNumericData>!' "

But I am unable to cast a different data type. Any suggestions. 

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Eric

How did you define the modifiedCryingEvent variable?