[Question] How do I calibrate the NXT Compass Sensor?

[althonich]

Question:
How do I calibrate the NXT Compass Sensor?

Context:
I was (and still am) trying to make a program that allows my robot to go in a straight line with the help of a PID. I noticed that my compass readings are inaccurate and attempted to recalibrate it to get better readings, but I don't know how to do so!

Any help will be greatly appreciated!

Screenshots:

Below is the code I have tried...

[laurensvalk]

The Ev3devSensor class has no write method, but you can add one. Have a look at the second example here.

It shows how you can add a method get_modes. It sounds like you want to add a method like write_command, which could look something like this (I have not tested this):

    def write_command(self, command):
        """Write to the command attribute."""

        # Open the command file.
        with open(self.path + '/command', 'w') as command_file:

            # Write the command.
            command_file.write(command)

[althonich]

The Ev3devSensor class has no write method, but you can add one. Have a look at the second example here.

It shows how you can add a method get_modes. It sounds like you want to add a method like write_command, which could look something like this (I have not tested this):

    def write_command(self, command):
        """Write to the command attribute."""

        # Open the command file.
        with open(self.path + '/command', 'w') as command_file:

            # Write the command.
            command_file.write(command)

I don't have much experience messing around with classes, can you please show me how to do it without the classes?

Thanks!

[laurensvalk]

Have you looked at the example I linked to? You can add the method shown here just below the get_modes method.

I'd recommend trying out the example as-is in a separate project first, and see if you can add the write_command method as described.

[althonich]

I'll try it out and let you know how it goes, thanks!

[dlech]

Is this still a problem?