FLL proportional alignment!

[Programator]

Could someone please help me on making a proportional alignment program with an EV3?

Thank you!

[z_beeblebrox]

Can you explain what you mean by "proportional alignment"? What do you want the program to do?

[Programator]

Sorry I did not specify, what the program is supposed to do is align on a colored line with light intensity while using a proportional controller.

Thank You

[DonRotolo]

Find the white paper here on CD somewhere called "PID without a PhD", that will help you understand the idea behind a P controller. Then search the term "PID" which is what you are looking for - just that your I and D terms will be ignored.

I'm not a programmer, and i know little about the EV3, but...

<Pseudocode>

Does sensor see line?
   Yes: Move forward a little
   No: Turn a little
repeat until you reach 'goal'

[Chris_Elston]

We didn't have a LEGO team this year, but last year we had a couple of PID "P" only drives. Attached are a few "test" samples that run in a loop for testing and tuning.

#1: LightDrive: This followed a black line with pin point precision. You're light sensor needs to be about 1/2" to 3/4" away from the line.

#2: GyroDrive: We could drive in a straight line using the Gyro.

Hope it helps.

[Programator]

Could someone please post a link to "PID without a PHD".
Thanks!

[adciv]

Here you go
http://www.embedded.com/design/proto...-without-a-PhD