Unable to get 3-wire sensors to work with V5

VEX V5 Technical Support UNOFFICIAL Tech Support
1

I am using C++ pro in VCS and am trying to use a potentiometer to select my autonomous like I have in previous years but have been unable to make it work. I declared the pot in the config screen using the correct syntax from the API, and then attempt to use it in autonomous to select my routine:


 vex::pot Pot = vex::pot(Brain.ThreeWirePort.B); 


void autonomous( void ) 
{
    if(Pot.value(vex::analogUnits::range8bit) < 400)
    {
        dist = 400;
        forward();
    }
    else if(Pot.value(vex::analogUnits::range8bit) < 800)
    {  
    }
    etc.
}

I can see the potentiometer value in devices on the brain screen, but it will run the code in the first if statement regardless of the pot’s value. I tried using percentUnits::pct and rotationUnits::deg with the same result. I previously had tried to use a bump sensor for another application and while I could see its value on the brain screen, the code ignored it as well. Any help would be appreciated.

2

Are you testing against 400 and 800 every time or have you changed those limits as well? Because 8 bit, percent, and degrees values will always be less than 400 for a potentiometer.

3

Is there a reason to not use 12bit for the potentiometer? Unless you want to really narrow the range of motion.

4

Thanks for the responses. I was previously unaware of the difference between 8, 10, and 12bit. I tried changed it to 12bit but it still did the same thing. Whenever I changed the units I always changed the values to match the units.

5

I had been starting the autonomous using the joystick. I just tried using the competition switch instead and everything work perfectly.

6