# Low frequency (NXT-ROS with USB)

Hello,

I'm trying to work on NXT-ROS using the USB. Right now I'm using an ultrasonic sensor, a color sensor and two servomotors. The problem is that I only get very low frequencies (~10Hz). If I raise the frequency of my sensors (for example up to 15Hz) I get something like this:

[WARN] [WallTime: 1424265476.725277] color_sensor not reaching desired frequency: actual 1.485489, desired 15.000000
[WARN] [WallTime: 1424265476.727759] ultrasonic_sensor not reaching desired frequency: actual 9.011199, desired 15.000000


I need a higher frequency for my application, but I don't know what is the problem.

I've read that there are some problems with frequency using the Bluetooth, but not with USB.

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