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Motor Encoders

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Motor Encoders

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goomba5tomper

Rookie

Joined: Thu May 03, 2012 2:55 pm
Posts: 2

Motor Encoders

OK I'm trying to learn how to use the motor encoders but everything i have tried has failed.

Can someone tell me how to program them cause everything i try the motor doesn't move at all or it will just keep going and never stop.

even a link would help, but an expert would really be great.

any tips would be helpful.
thanks

Thu May 03, 2012 5:19 pm

NeXT-Generation

Senior Roboticist

Joined: Wed Sep 28, 2011 10:13 pm
Posts: 509
Location: Totally not spying on Hassenplug to see what he has for the Brickworld Chicago 2013 sumo contest.

Re: Motor Encoders

What do you want to do with them? Can you post some of the code you've tried? Are you using the latest version of RobotC (3.08) and the latest firmware (9.12)?

P.S. Notice my rank (beneath the username) :mrgreen:

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Thu May 03, 2012 5:30 pm

magicode

Moderator

Joined: Tue Sep 14, 2010 9:19 pm
Posts: 495

Re: Motor Encoders

You need to give us more information. What platform are you using? Mindstorms or Vex? If you've tried code post it here as NeXTGeneration suggested. Take a look at the tutorials provided.
VEX: http://www.robotc.net/education/curriculum/vex/
Mindstorms: http://www.robotc.net/education/curriculum/nxt/

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Thu May 03, 2012 7:32 pm

goomba5tomper

Rookie

Joined: Thu May 03, 2012 2:55 pm
Posts: 2

Re: Motor Encoders

i am using mindstorms


	Code: task main() { nMotorEncoder[motorD] = 0; // Reset encoder nMotorEncoderTarget[motorD] =1440; // Sets target to one full rotation while(nMotorRunState[motorD] < 1440) { motor[motorD] = 75; // Wait until encoder value is reached. } motor[motorD] = 0; }

from what i have read this should only be 1 rotation of the motor but it just goes and doesnt stop

Fri May 04, 2012 10:25 am

NeXT-Generation

Senior Roboticist

Joined: Wed Sep 28, 2011 10:13 pm
Posts: 509
Location: Totally not spying on Hassenplug to see what he has for the Brickworld Chicago 2013 sumo contest.

Re: Motor Encoders

It looks to me like your using the Hi-Technic motor controller, right? I've no experience with this, but I think that the same rules that apply to MindStorms motors apply to these.

Try this code:


	Code: task main() { nMotorEncoder[motorD] = 0; // Reset encoder nMotorEncoderTarget[motorD] =1440; // Sets target to one full rotation while(nMotorRunState[motorD] != runStateIdle) { motor[motorD] = 75; // Wait until encoder value is reached. } motor[motorD] = 0; }

And this:


	Code: task main() { nMotorEncoder[motorD] = 0; // Reset encoder while(nMotorEncoder[motorD] <= 1440) { motor[motorD] = 75; // Wait until encoder value is reached. } motor[motorD] = 0; }

You see, the problem with your original code is that the nMotorRunState[] doesn't use a number as a condition. If you want to use a number, then just read the encoder value like in my second sample. If you use nMotorRunState[], then wait for it to be equal to runStateIdle.

Do either of these work?

Fri May 04, 2012 10:41 am

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