Phidgets Forums

I hooked up a DC motor and power supply to the 1065, plugged it into my computer and I can control it from the PhidgetControl center. Everything is working great, except for the current sensor.

When I open the window for the sensor it constantly reads 0 A, despite the fact that the motor is moving, which clearly means that it is drawing at least SOME current.

Do I have a defective board or did I not do something correctly?

There is a possibility that the motor is so efficient that once it gets up to speed, there's almost no current going through it (less than 100mA). At lower PWM duty cycles, the current sensor may be getting tricked by the low inductance of the motor and the large current spikes that go along with that.

It's also possible that the current sensor chip is faulty or damaged. You can try to test it with a larger motor or by loading it down so the motor has to work harder. I also recommend moving the data interval slider all the way to the left so you can see changes that may occur too fast for the default interval.