Accelerometer multiple axeses

rosemark0208 · March 2016

I am trying to evaluate the accelerometer based on multiple axises.

pseudocode from what I'm trying to achieve is as follows:

accelModule.routeData().fromZAxis()

.split()

.branch().process(new Comparison(Comparison.Operation.LTE, -0.8))

.monitor...... turn on blue light

.branch().process(new Comparison(Comparison.Operation.GTE, 0.8))

.monitor.... turn on red light

.branch()... turn off light

I know the documentation states you can not use the "comparison" filter when using

accelModule.routeData().fromAxis

without doing a "summing" operation such as RSS() or RMS()... is there a way to evaluate the accelerometers 3 axises and make decisions accordingly?

i.e. if accelerometer.X > 1 and accelerometer.Y < 0

Do this...

Eric · March 2016

No, the data processor does not support operations using multiple data sources.

rosemark0208 · March 2016

Do you know if you plan on providing this support in the future?

JpEncausse · March 2016

+1

What best practice to check axis X,Y,Z to do something "offline" ?

For instance I need this for the MetaDice

JpEncausse · March 2016

Can we get X,Y,Z values from DataToken ? Or use a Processor to store the X,Y,Z values ?

AsyncOperation<RouteManager> routeManagerResult = accelModule.routeData().fromAxes().monitor(
    new DataSignal.ActivityHandler() {
        @Override
        public void onSignalActive(Map<String, DataProcessor> processors, DataSignal.DataToken token) {
            Log.i("SIGNAL", "ACTIVE");

            ledModule.configureColorChannel(Led.ColorChannel.RED)
                     .setRiseTime((short) 0).setPulseDuration((short) 400)
                     .setRepeatCount((byte) 2).setHighTime((short) 200)
                     .setHighIntensity((byte) 16).setLowIntensity((byte) 16)
                     .commit();
            ledModule.play(true);
        }
    }
).commit();

rosemark0208 · March 2016

I have found a way to accomplish something that allows this to be accomplished... I could only get it to work using the android SDK... the IOS SDK has the primitives to perform this operation but I believe it has some bugs.

The key was using the "Passthrough" filter.

accelModule.routeData().fromYAxis()
        .process(new Maths(Maths.Operation.ADD, 0))
        .split()
        .branch().process(new Comparison(Comparison.Operation.LTE, 0.5)) //Left side
        .branch().process(new Comparison(Comparison.Operation.GTE, -0.5)) //Left side
        .process("temp_cond_gate", new Passthrough(Passthrough.Mode.CONDITIONAL, (short) 1))
        .process(new Time(Time.OutputMode.ABSOLUTE, 30000))
        .monitor(new DataSignal.ActivityHandler() {
            @Override
            public void onSignalActive(Map<String, DataProcessor> processors,
                                       DataSignal.DataToken token) {
                ledModule.stop(true);
                ledModule.configureColorChannel(Led.ColorChannel.RED)
                        .setRiseTime((short) 0)
                        .setPulseDuration((short) 2000).setRepeatCount((byte) -1)
                        .setHighTime((short) 1000).setHighIntensity((byte) 31)
                        .setLowIntensity((byte) 31).commit();
                ledModule.play(true);
            }
        }).end()
        .commit();

accelModule.routeData().fromXAxis()
        .process(new Maths(Maths.Operation.ADD, 0))
        .split()
        .process(new Comparison(Comparison.Operation.GT, -0.75))
        .monitor(new DataSignal.ActivityHandler() {
            @Override
            public void onSignalActive(Map<String, DataProcessor> processors,
                                       DataSignal.DataToken token) {
                //Turn it off
                processors.get("temp_cond_gate").setState(new Passthrough.State((short) 0));
            }
        }).end()
        .commit();


accelModule.routeData().fromXAxis()
        .process(new Maths(Maths.Operation.ADD, 0))
        .split()
        .process(new Comparison(Comparison.Operation.LT, -0.75))
        .monitor(new DataSignal.ActivityHandler() {
            @Override
            public void onSignalActive(Map<String, DataProcessor> processors,
                                       DataSignal.DataToken token) {
                ledModule.stop(true);

                //Turn it on
                processors.get("temp_cond_gate").setState(new Passthrough.State((short) 1));
            }
        }).end()
        .commit();

Eric · March 2016

@rosemark0208 ;

Apologies, I spoke too hastily. The data processor does support multiple sources for some processors, such as comparator and math, which can be used to create feedback or feedforward loops; this is expressed with the DataToken class. What it does not do is perform boolean logic i.e. there is no processor that transforms "X > Y " into 0/1 nor computes "0 and 1". It is something that we can look into adding so you don't have to use funky passthrough processors.

I drew this up earlier but it looks like you beat me to the punch

.

https://www.dropbox.com/s/1l8tpa7kg1ol7kr/and_passthrough.jpg

What specifically are you looking to accomplish?

@JpEncausse

If you need access to individual XYZ values, use the "fromAxis" functions.

JpEncausse · March 2016

In fact with Stream code I do (but it could be much more complicated):

public void process(Message message) {

    final CartesianFloat axes = message.getData(CartesianFloat.class);
           if (axes.x() < -0.8){
      setDice(5); // A
    } else if (axes.x() >  0.8){
      setDice(3); // B
    } else if (axes.y() < -0.8){
      setDice(4); // C
    } else if (axes.y() >  0.8){
      setDice(2); // D
    } else if (axes.z() < -0.8){
      setDice(1); // E
    } else if (axes.z() >  0.8){
      setDice(6); // F
    }
}

So I was looking the best way to do that logic on board to update the minor state of iBeacon. The trick of using settingsModule.startAdvertisement(); with  settingsModule.configure().setAdInterval((short)200, (byte)2); works fine

Can I retrieve X,Y,Z and do some code logic in monitor() function ?

rosemark0208 · March 2016

Unless I misunderstood Eric I don't believe you can not retrieve x,y,z on the acceleromter and do logic... You would have to use feedback and forward loops as specified above.

JpEncausse · March 2016

@Eric ok it almost work !

https://gist.github.com/JpEncausse/7d4766cb2b2207a49ab9

- The settingsModule.startAdvertisement(); crash the BLE connection with the mobile but it's OK

- I lost the X Axis:

The stream part works with all sides but the monitor part never call sides 5 and 3 I don't understand why.

May be a side effect ? I assume X, Y, and Z can be triggered at the same time and override each other ?

But moving X and Y code still prevent 5 and 3. May be X axis is more sensitive ?

Any ideas ?

I also do:
settingsModule.configure().setAdInterval((short) 200, (byte) 2);

Don't know if it's good values ?

Thanks

EDIT: I comment code Y and Z but X still doesn't trigger ? Thats weird ? (Metaware C)

EDIT2: I also need to remove battery to get an up to date code

Eric · March 2016

Hrm...if you reduce the data rate to say 25Hz or lower, does the chain work then? I don't see anything wrong codewise in the firmware comparator but this is an odd occurrence.

JpEncausse · March 2016

Yes it workss !!!!

Thanks

Accelerometer multiple axeses

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