Help please with adding a third motor on drive using driver control

VEX IQ General Discussion Official Answers - Ask the VEX Staff!
1

We needed more power to drive our robot up the ramp with a recent modification and can just barely crawl. We added another motor to the rear wheel, but how can we get it to operate using the driver controls?

Please help, we have the state tourny in a few days!!

2

Hi rodclause,

Since you have mentioned in a separate thread here that you are using ROBOTC, here is an example of how to to enable a 6 motor drive train (3 motors per side) in both ROBOTC Graphical and [Text-Based] ROBOTC.

ROBOTC Graphical:

**Text-based ROBOTC: **(Based off of the “Simple 2-Joystick Drive.c” example program)

#pragma config(Motor,  motor1,          leftMotor,     tmotorVexIQ, openLoop, driveLeft, encoder)
#pragma config(Motor,  motor2,          leftMotor2,    tmotorVexIQ, PIDControl, driveLeft, encoder)
#pragma config(Motor,  motor3,          leftMotor3,    tmotorVexIQ, PIDControl, driveLeft, encoder)
#pragma config(Motor,  motor4,          rightMotor3,   tmotorVexIQ, PIDControl, reversed, driveRight, encoder)
#pragma config(Motor,  motor5,          rightMotor2,   tmotorVexIQ, PIDControl, reversed, driveRight, encoder)
#pragma config(Motor,  motor6,          rightMotor,    tmotorVexIQ, openLoop, reversed, driveRight, encoder)
//*!!Code automatically generated by 'ROBOTC' configuration wizard               !!*//

/*------------------------------------------------------------------------------------------------
  This program will use the VEX IQ Wirless Controller to drive your Clawbot. This program will use
  "Tank Mode" to enable two joysticks to drive the two main motors of the Clawbot.

  The 4 joystick axis on the VEX IQ Wireless Controller return values from -127 to +127.

  Note: You will have to set ROBOTC to enable "Wireless Control" to use the VEX IQ joystick.
------------------------------------------------------------------------------------------------*/

task main()
{
    repeat(forever)
    {
        setMotorSpeed(leftMotor, getJoystickValue(ChA));
        setMotorSpeed(leftMotor2, getJoystickValue(ChA));
        setMotorSpeed(leftMotor3, getJoystickValue(ChA));
        setMotorSpeed(rightMotor, getJoystickValue(ChD));
        setMotorSpeed(rightMotor2, getJoystickValue(ChD));
        setMotorSpeed(rightMotor3, getJoystickValue(ChD));
    }
}

Regards,