How to get gyroscope data in pythonista?

[WoodBridge]

I want to get the acceleration values and angular velocity values of the device via Pythonista. Through the motion module, I can get the acceleration. But how do I get the value of the angular speed (gyroscope value)?

And I post the documentation of motion

motion — Motion Sensor Data on iOS
The motion module allows you to access your iOS device’s motion sensor data (accelerometer, gyroscope, magnetometer).

Functions in the motion module:

motion.start_updates()
Start monitoring the device’s motion sensors. You should balance this with a stop_updates() call to improve battery life. All the get... functions require that you call start_updates() first, otherwise, no meaningful data will be returned.

motion.stop_updates()
Stop monitoring the device’s motion sensors.

motion.get_gravity()
Return the gravity vector (x, y, z).

motion.get_user_acceleration()
Return the acceleration the user is giving to the device. The total acceleration is equal to the gravity vector returned from get_gravity() plus the user acceleration.

motion.get_attitude()
Return the attitude of the device (roll, pitch, yaw).

motion.get_magnetic_field()
Return the magnetic field vector with respect to the device (x, y, z, accuracy).

[ccc]

https://forum.omz-software.com/topic/1031

[cvp]

@WoodBridge The Pythonista motion module only gives a part of the gyroscopic data.
But iOS ObjectiveC CMMotionManager class gives full gyroscopic data.
Could you try this little script which allows you to select a photo in your camera roll and displays it as a 3D box that you can rotate in all directions with your finger. Check the code and you will see how to get rotation rate from gyroscopic data.

code is here

[WoodBridge]

@ccc Thank you for your replay. But I can't find any port to get gyro data in pythonista in this link. On the other hand , I usually to get eular angle by fusion accl and gyro with mahony or kalman filter.
But I can't get gyro data in motion. (Motion module privide angle x, y ,z ).

[cvp]

@WoodBridge in the code, you find these lines and CMMotionManager.gyroData()

		# https://forum.omz-software.com/topic/3030
		CMMotionManager = ObjCClass('CMMotionManager').alloc().init()
		#print(CMMotionManager.isDeviceMotionAvailable())
		CMMotionManager.startGyroUpdates()
		while True:
			# EulerAngles is a SCNVector3
			# The order of components in this vector matches the axes of rotation:
			# Pitch (the x component) is the rotation about the node’s x-axis.
			# Yaw (the y component) is the rotation about the node’s y-axis.
			# Roll (the z component) is the rotation about the node’s z-axis.
			#pitch += (random() - 0.5) * delta_ang
			#yaw   += (random() - 0.5) * delta_ang
			#roll  += (random() - 0.5) * delta_ang
			gyro_data = CMMotionManager.gyroData()
			if not gyro_data:
				#print('data not available (yet?)')
				continue
			# Using the custom struct here:
			rate = gyro_data.rotationRate(argtypes=[], restype=self.CMRotationRate)
			# You can now access the struct's fields as x, y, z:
			roll  = rate.z
			pitch = rate.x
			yaw   = rate.y
			#print(rate.x, rate.y, rate.z)

[WoodBridge]

@cvp I find the method you provided useful, but I think I need to spend some time validating it. I want to get both the original acceleration value and the gyroscope value. This way I can implement a lot of algorithm verification and testing with them.

[cvp]

@WoodBridge please read Apple doc here CMMotionManager

[WoodBridge]

@cvp said in How to get gyroscope data in pythonista?:

CMMotionManager

Thanks very much, It's very useful!