Return only Accel values

[espruino-discuss]

Posted at 2022-08-11 by psc1988

Hi,

I saw the documentation about the built in accelerometer/gyroscope.
How I can return only the x/y values of the accelermoter, starting at 0?

Best regards

[espruino-discuss]

Posted at 2022-08-11 by psc1988

Got it.

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Posted at 2022-08-11 by psc1988

Puck.accelOn();

Puck.on('accel', function(data) {
  console.log(data.acc.x);
});

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Posted at 2022-08-11 by psc1988

But I have another question.

Any idea how I can get x/y starting at 0 with a non sensitive movement tracking?
The raw values changing very fast.

I would like to use the Puck.js as a Joystick.

Best regards

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Posted at 2022-08-11 by @gfwilliams

To get the value from 0, you need to subtract a 'base' value.

For instance you could do:

Puck.accelOn();
var accZero = Puck.accel().acc; // get the base value when we start up
Puck.on('accel', function(data) {
  console.log(data.acc.x - accZero.x);
});

If you want to stop the values moving so fast, you can do an average:

Puck.accelOn();
var accZero = Puck.accel().acc; // get the base value when we start up
var avrX = 0;
Puck.on('accel', function(data) {
  avrX = (avrX*0.9) + 0.1*(data.acc.x - accZero.x);
  console.log(avrX);
});

You can change values to get a slower movement but they must always add up to 1, so 0.9/0.1 or 0.8/0.2(faster) or 0.95/0.05(slower)

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Posted at 2022-08-11 by psc1988

Awesome, thank you Gordon!