Hello all,

I have recently joined my schools robotics team because they needed programmers, and I am fairly proficient in java (and heard c++ is quite similar) so I joined but I am having some really annoying results, or lack there of. We built the Ranger bot from this site http://www.tetrixrobotics.com/GettingStartedGuide/ and followed all of the steps exactly. But for some reason when I run the program, nothing happens. Am I using the wrong version? Please help...

Thanks,
Brad

Can you please post the code you used, along with a description of the setup of the wiring (where the motor controllers/motor wires/battery wires are going)?

Here is the code I used

#pragma config(Hubs, S1, HTMotor, HTServo, none, none)
#pragma config(Motor, mtr_S1_C1_1, motorD, tmotorNormal, openLoop, reversed)
#pragma config(Motor, mtr_S1_C1_2, motorE, tmotorNormal, openLoop)
#pragma config(Servo, srvo_S1_C2_1, servo1, tServoNone)
#pragma config(Servo, srvo_S1_C2_2, servo2, tServoNone)
#pragma config(Servo, srvo_S1_C2_3, servo3, tServoNone)
#pragma config(Servo, srvo_S1_C2_4, servo4, tServoNone)
#pragma config(Servo, srvo_S1_C2_5, servo5, tServoNone)
#pragma config(Servo, srvo_S1_C2_6, servo6, tServoNone)
//*!!Code automatically generated by 'ROBOTC' configuration wizard !!*//

task main()
{
//go forward for 2 seconds
motor[motorD]=15;
motor[motorE]=15;
wait1Msec(2000);

//stop for 1 second
motor[motorD]=0;
motor[motorE]=0;
wait1Msec(1000);

//turn around
motor[motorD]=90;
motor[motorE]=-90;
wait1Msec(1000);

//stop for 1 second
motor[motorD] = 0;
motor[motorE] = 0;
wait1Msec(1000);

//go forward for 2 seconds
motor[motorD]=15;
motor[motorE]=15;
wait1Msec(2000);

//stop
motor[motorD] = 0;
motor[motorE] = 0;
}

and I attaced a pic of the entire thing

And here is a better shot at the wiring

Your code and wiring look fine; the only thing I can possibly imagine is that you're not giving the motors enough power on the "forward" sections. Sometimes, low values for motor power (especially on high-load applications) won't function at all. Try replacing all the 15's with 100's, and see if that helps. Other than that, everything looks right to me.

When you start the program on the NXT, does it say the program is running? Is the NXT firmware up to date with your version of RobotC?

Try testing the motors individually to make sure they're not broken or damaged.



EDIT: Also, make sure your Tetrix battery is fully charged.

Along with what amcerbu has suggested, double check the obvious; are the motor and servo controllers receiving power (meaning, is the switch turned to on)? It may seem like a no-brainer, but I know how many times I've personally forgotten to turn the robot's motors on and was left scratching my head on why it's not working. Make sure you have the red lights on before you tear the robot apart looking for a solution!

Charging the tetrix battery to the max fixed it... lol thanks guys