Quadrature Encoders Problem

VEX V5 General Discussion General Forum
#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

try flipping which wires you have plugged in. So like the 2 wires that are on the quad encoder, just take the one in port 2 and put it in port 1 and port 1 into port 2, or whichever sensor is having the problem. That works for me sometimes. Also, in you code you could just say


int leftEncoder = SensorValue[left];
#3

It should work. Couple of things to try.

  1. Make sure connections are correct, is real easy to offset everything by one position, perhaps just connect one encoder at a time to simplify connections.

  2. V2.32 is the latest release of RobotC, there’s always a chance there was a bug in 2.31, perhaps upgrade to be on the safe side.

#4

The weird thing is… I can swap the two wires and it will do the same thing. Also as I mentioned, I can swap the pragmas and the opposite one will work. The club I’m in has a building licence so I cant upgrade to the newest version.

#5