Quadrature Encoders

Programming Support ROBOTC Tech Support
1

Hello,
I am trying to use two quadrature encoders with robotc v2.31. Here is my code:

#pragma config(Sensor, dgtl1,  right,               sensorQuadEncoder)
#pragma config(Sensor, dgtl3,  left,                sensorQuadEncoder)
//*!!Code automatically generated by 'ROBOTC' configuration wizard               !!*//

task main()
{
  SensorValue[left] = 0;
  SensorValue[right] = 0;
  while(true)
  {
    int leftEncoder = SensorValue[dgtl1];
    int rightEncoder = SensorValue[dgtl3];
    wait1Msec(10);
  }
}

I am having a problem reading the second encoder (left) value. I have manually swapped the pragma statements so that the left encoder is on the top. I am then only able to read the left encoder. Which ever encoder is not first pulses (like it is raw data) from 1 to 0. I am running this code on a Cortex (without the VEXnet “hump”). I have tried all of the sample code and they all have the same problem.

Any help would be greatly appreciated.

2

Sorry to hear that you’re having trouble. First, you might try updating to ROBOTC 2.32: http://www.robotc.net/download/cortex/ Make sure you update the Master and ROBOTC Firmware files once you do.

Second, try separating the two encoders a bit in the DIGITAL bank - use ports 1+2 and 5+6.

3

Thank you for responding.
How would I update RobotC if I have a building licence? Is it the same as just downloading the file from robotc.net?

4

The correct download can be found here: http://www.robotc.net/files/ROBOTCforCortexPIC_232_Building.exe

You can use the license file that was provided when the software was purchased.

5

Thank you. I haven’t uploaded the new firmware but I got the program installed.:slight_smile: