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Project Help

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Project Help

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ericsmalls

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Joined: Tue Dec 21, 2010 1:38 pm
Posts: 24

Project Help

How do you combine an if/else or while loop with sonar and motor synchronization?

motor synchronization without an if/else or while loop and the sonar sensor work fine but when i combine the loop with the sonar senosr the motors are no longer synced and the sonar senor value is ignored :/

my code that works looks like this


	Code: task main() { nSyncedMotors = synchBA; nSyncedTurnRatio = 100; motor[motorB] = 50; wait1Msec (5000) /* I dont want it to be 5 seconds I want it to be forever or as long as the robot's not within 25 cm of an object */ }

here's the one that doesnt work how i want it to


	Code: task main() { while(true) { if (SensorValue(sonarSensor) > 25) nSyncedMotors = synchBA; nSyncedTurnRatio = 100; motor[motorB] = 50; wait1Msec (5000) } }

Please Help.

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Eric Smalls
About Me: http://www.stanford.edu/~esmalls/
My Projects: http://www.ericsmalls.com/p/my-projects.html

Fri Dec 24, 2010 9:15 am

mightor

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Joined: Wed Mar 05, 2008 8:14 am
Posts: 2864
Location: Rotterdam, The Netherlands

Re: Project Help

Hi Eric,

Why don't you try this:


	Code: task main() { while(true) { // First check if we're more than 25 cms away and if so, // setup the motor synchronisation and speed if (SensorValue(sonarSensor) > 25) { nSyncedMotors = synchBA; nSyncedTurnRatio = 100; motor[motorB] = 50; // Now we just wait until until we're not so far away while(SensorValue(sonarSensor) > 25) wait1Msec (10); } // Change the motors' behaviour here if you'd like. You can turn them off, for example }

- Xander

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Fri Dec 24, 2010 11:09 am

ericsmalls

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Joined: Tue Dec 21, 2010 1:38 pm
Posts: 24

Re: Project Help

i tweaked it a little; now it works perfect but when i use it in my primary program the bottom half of code doesnt work

do want me to post the code? it's pretty long.

_________________
Eric Smalls
About Me: http://www.stanford.edu/~esmalls/
My Projects: http://www.ericsmalls.com/p/my-projects.html

Fri Dec 24, 2010 7:53 pm

mightor

Moderator

Joined: Wed Mar 05, 2008 8:14 am
Posts: 2864
Location: Rotterdam, The Netherlands

Re: Project Help

Just attach the program as a whole, instead of pasting it into the message. Just like you would attach a file to a mail

- Xander

Sat Dec 25, 2010 1:53 am

ericsmalls

Moderator

Joined: Tue Dec 21, 2010 1:38 pm
Posts: 24

Re: Project Help

I highlighted the parts I'm having problems with


	Attachments: Project Nomad.c [1.95 KiB] Downloaded 148 times

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Eric Smalls
About Me: http://www.stanford.edu/~esmalls/
My Projects: http://www.ericsmalls.com/p/my-projects.html

Sat Dec 25, 2010 12:10 pm

mightor

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Joined: Wed Mar 05, 2008 8:14 am
Posts: 2864
Location: Rotterdam, The Netherlands

Re: Project Help

Hi Eric,

I've made quite a few changes to your program. The most important ones being the use of nSyncedTurnRatio. Read my comments in the code.

Some pointers:

Use the motor and sensor setup to give your motors and sensors sensible names. I've renamed your motors MLEFT, MRIGHT and MSENSE.
The most important thing you need to learn and be religious about is indentation!!! It took me a few minutes just to realign all the brackets. Indentation will make tracking down bugs so much easier. Get into the habit now, you'll thank me later.

- Xander


	Attachments: Project Nomad.c [3.24 KiB] Downloaded 145 times

Sun Dec 26, 2010 5:14 am

ericsmalls

Moderator

Joined: Tue Dec 21, 2010 1:38 pm
Posts: 24

Re: Project Help

Thank you for your help and i appreciate your advice.

Is it okay for me to post my project to the Cool project and get it on the website?

_________________
Eric Smalls
About Me: http://www.stanford.edu/~esmalls/
My Projects: http://www.ericsmalls.com/p/my-projects.html

Mon Dec 27, 2010 12:06 pm

mightor

Moderator

Joined: Wed Mar 05, 2008 8:14 am
Posts: 2864
Location: Rotterdam, The Netherlands

Re: Project Help

I see no reason why not

- Xander

Mon Dec 27, 2010 12:23 pm

karan.hiremath

Rookie

Joined: Sun Jan 02, 2011 1:57 am
Posts: 31

Re: Project Help

hey cool project just one quick tip:

Ctrl+alt+shift+a+f is your friend: auto formats the whole file correctly indented and everything! saves hours of work...

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Tue Jan 04, 2011 10:54 pm

mightor

Moderator

Joined: Wed Mar 05, 2008 8:14 am
Posts: 2864
Location: Rotterdam, The Netherlands

Re: Project Help

You can also find that (and some other options) here:

- Xander

Wed Jan 05, 2011 3:06 am

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