Get And Compare The Vertical Position of The Phone to The Ground

[nishyanthkumar]

I'm making an app (a collaboration), and for this, we're using a camera with an overlay on top of it. We're hoping to use this so that the user(s) can only take a photo when it's at a specific angle. Unfortunately, I'm not sure how to get the angle.

The idea goes like this:

1. The user calibrates the device on a flat surface using a Button.
2. The overlay will point in the direction of where the phone should be tilted, and a capture Button will be enabled when the phone is titled at an angle between -1.5° and +1.5° of the target values (these will be read from a list).

I've tried reading the documentation for the GyroscopeSensor and the Accelerometer, but I couldn't exactly understand how I could use this in the app. For this reason, I'm reaching out to the amazing folks present on this Community.

Have a good day.

TBI

@Matthew_Bjerregaard

[TIMAI2]

See here

Basic Spirit Level (read all)

If you used @Kumaraswamy's Procam extension with the above, you could have a preview, and automatically take the picture when the camera is level ....

[nishyanthkumar]

@TIMAI2

If you used @Kumaraswamy's Procam extension with the above

Yes, I'm using exactly that one. (Great extension, by the way. Thank you @Kumaraswamy)

@TIMAI2

and automatically take the picture when the camera is level .

Thank you, but it would be better for the shot to be manually initiated.

[nishyanthkumar]

Ouch, I forgot the OrientationSensor even existed.
I've read the documentation, but couldn't find anything about calibrating it. Is there a method to do this? Or is it calibrated automatically on initialization?

[TIMAI2]

As I believe @SteveJG suggests, you find a flat surface and calibrate it from there....

[SteveJG]

Taifun's tutorial to to trigger something if device is facing down https://puravidaapps.com/snippets.php#2accelerometer

Unfortunately the Orientation Sensor hardware is not available in higher Android devices. You need to use the Accelerometer.

[nishyanthkumar]

@SteveJG

Unfortunately the Orientation Sensor hardware is not available in higher Android devices

Does it work on very old phones that run Android 2/3/4? The app is meant to target rural areas that don't particularly have sophisticated technology.

[SteveJG]

@nishyanthkumar

Does it work on very old phones that run Android 2/3/4?

It being the Orientation sensor. Yes, it should work as these devices probably have Orientation sensor hardware. Why not try?