HELP --- Motor Power Code not working --- MIT App Inventor

[Guest]

We are having issues with our blocks for using a bumper to move a motor forward and backward. Here is a picture of our blocks https://goo.gl/X0VhYa If anyone has any ideas, they would be greatly appreciated. We are having to use one controller for this weekend due to many members taking the SAT.

Thanks

[GearTicks]

You can't assign a string to a direction. You should use Direction_REVERSE instead. Also, in your code, depending on which bumpers are pressed, it is possible that you will assign the motor "spinner" a power two or three times in the loop. I think you want something like:

if FtcGamepad1.RightBumper
  then set spinner.Power to 1
else if FtcGamepad1.LeftBumper
  then set spinner.Power to -1
else
  set spinner.Power to 0

[Tom Eng]

Hi FTC7785,

I agree with GearTicks. I think you want to use the enumerated "Direction_REVERSE" value that is available with the DcMotor object in App Inventor. Please take a look at the following screen shot for an example of how to reverse the direction of a DC motor.

https://drive.google.com/open?id=0B_7ZNztySlZhdldrRFM3MFRJSFk

Tom

[Tom Eng]

I've moved this thread to the App Inventor subforum.