Log a single sensor read at button press

TheStudent

Hi

I have a MetaMotionR+ and I need to log the Euler angles once every time the button is pressed. It need to be run on the device without an active connection, and then be downloaded at a later time.

So far I have managed to set up data route for logging the Euler angles, and then similar to the tutorial at "6.1.4. Event Handling" I have set the device to start logging when the button is pressed down, and stop logging when the button is released. But this resolves in many sensor readings even with a short button press.

Is it possible to control exactly how many sensor readings that are logged, and how?

Any help is appreciated

Eric

Use a passthrough limiter in count mode.

• https://mbientlab.com/androiddocs/latest/data_route.html#passthrough
• https://mbientlab.com/androiddocs/latest/data_processor.html#modifying-processors
• https://github.com/mbientlab/MetaWear-SDK-Android/blob/3.4.0/library/src/test/java/com/mbientlab/metawear/TestDataProcessor.java#L716

TheStudent

I have tried to implement it, but without any luck so far..

This is where I am at, can you tell me what I have done wrong?

sensorFusion.eulerAngles().addRouteAsync(new RouteBuilder() {
            @Override
            public void configure(RouteComponent source) {
                source.delay(samples).limit(Passthrough.COUNT, (short) 0).name("test");
                source.log(new Subscriber() {
                    @Override
                    public void apply(Data data, Object... env) {
            //Printing data
                        System.out.println(data.value(EulerAngles.class).roll());
                    }
                });
            }
        });

Eric

You are not logging the passthrough output and your chain has an unneeded delay component.

The Euler angles route should direct its data to a passthrough limiter (first link). The switch state route will modify the passthrough limiter when the button is pressed to allow a fixed number of data points through (2nd and 3rd links).