Setting the frequency command of HiTechnic Color Sensor V2

[dianabarrett]

Hi!

Is there a way of setting 50Hz or 60Hz frequency values of the HT Color Sensor V2?
I've seen a similar topic here on ev3dev discussion board ev3dev/ev3dev#1292 (comment) and an answer by @dlech. I've tried something like this, gathered from examples and answers:

class HiTechColorSensor(Ev3devSensor):
    def __init__(self, port):
        # Initialize the parent class.
        super().__init__(port)

        # Get the sysfs path.
        self.path = '/sys/class/lego-sensor/sensor' + str(self.sensor_index)

    # configure the sensor for 60Hz
    def set_60hz(self):
        with open(self.path + 'command', 'w') as file:
            file.write('60Hz')

I'm getting an error when calling set_60Hz:

OSError: [Errno 13] EACCES

Question:
Is it at all possible to set the frequency to a specific value? If yes, what would be the approach?

[dlech]

self.path = '/sys/class/lego-sensor/sensor' + str(self.sensor_index)

This needs a trailing slash:

self.path = '/sys/class/lego-sensor/sensor' + str(self.sensor_index) + '/'

[dianabarrett]

Thank you, @dlech. I've added the slash and now I'm getting another error:

OSError: [Errno 22] EINVAL

[dlech]

I think 60HZ needs to be all upper case.

[dianabarrett]

That was it! Thank you very much!!