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Nick Laferriere

Programming Solutions for the LEGO Mindstorms NXT - Which approach is best for you? | R... - 1 views

find.botmag.com/100701

sensor sensors detection robot Ultrasonic wall obstacle sound NI iRobot

shared by Nick Laferriere on 12 Mar 12 - No Cached
  • Nick Laferriere on 12 Mar 12
     
    Programming Solutions for the LEGO Mindstorms
Declan Coen

PID Controller For Lego Mindstorms Robots - 7 views

www.inpharmix.com/...or_Lego_Mindstorms_Robots.html

pid nxt

shared by Declan Coen on 12 Mar 12 - Cached
  • light sensor "sees white" then we know it is left of the line's edge (and the line). If it "sees black" then we know it is to the right of the line's edge (and on the line). This is called a "left hand line follower" since it is following the line's left edge
  • We need to know what values the light sensor returns when it "sees white" and when it "sees black". A typical uncalibrated sensor might give a "white" reading of 50 and a "black" reading of 40 (uncalibrated, on a 0 to 100 scale). It is convenient to draw the values on a simple number line to help visualize how we convert light sensor values into changes in the robot's movement.
  • Below are our made up light values for white and black.
  • ...4 more annotations...
  • We'll just divide the range into two equal pieces and say that if the light level is less than 45 we want the robot to turn left. If it is greater than 45 we want to turn right. I won't go into how exactly the turns should be done. I'll just say that gentle turns work well for a fairly straight line
  • line with lots of curves usually needs to be making sharper turns. For gentle turns you might use Power levels of 50% on the fast wheel and 20% on the slow wheel. For sharper turns on a curvy line you might need to use 30% power for the fast wheel and coast or brake the slow wheel. Whatever power levels you use the numbers will be the same for the two turns, you just switch which motor gets the big number and which get the smaller number (or a stop command).
  • This type of a line follower will follow a line but it isn't very pretty. It looks OK on a straight line with with the motors programmed for gentle turns. But if the line has any curves then you have tell the robot to use sharper turns to follow line. That makes the robot swing back and forth across the line. The robot only "knows" how to do two things; turn left and turn right. This approach can be made to work but it is not very fast or accurate and looks terrible.
  • In the above approach the robot never drives straight, even if it is perfectly aligned with line's edge and the line is straight. That doesn't seem very efficient does it? Lets try to fix that. Instead of dividing our light value number line into two regions lets divide it into three.
  • Anthony DiVirgilio on 12 Mar 12
     
    seems useful for following a line effectively
  • ...1 more comment...
  • Thomas Corcoran on 12 Mar 12
     
    this is a really good technique
  • Declan Coen on 12 Mar 12
     
    the top of this article explains how it would be easier to follow the edge of the line rather than the center of the line. As it detects the white it will turn back to the black and as it detects the black it will turn back to the white.
  • Thomas Helm on 12 Mar 12
     
    i found the edge thing on another site too
Alexander Laferriere

Vision Subsystem v4 for NXT (NXTCam-v4) - www.mindsensors.com - 1 views

www.mindsensors.com/index.php

shared by Alexander Laferriere on 12 Mar 12 - Cached
  • Bryan Kelleher on 12 Mar 12
     
    what does this do?
Thomas Helm

NXT Forklift - 6 views

www.nxtprograms.com/...steps.html

shared by Thomas Helm on 17 May 12 - Cached
  • Declan Coen on 17 May 12
     
    this is a great idea because it is effective and we can use fishing line in place of the string. Our fork lift would have to be wider though.
  • Thaddeus McKeon on 17 May 12
     
    also shows how to make a bluetooth connection very doable to
Thaddeus McKeon

NXT Mini Sumo Bot - 2 views

www.nxtprograms.com/...steps.html

shared by Thaddeus McKeon on 17 May 12 - Cached
  • Thaddeus McKeon on 17 May 12
     
    this shows how to build a nice sumo bot
Declan Coen

Control From Iphone or Ipod Touch - 7 views

some programs on it can be harmful. I had to restore my ipod three times

iphone control bot

started by Declan Coen on 17 May 12 5 follow-ups, last by Declan Coen on 17 May 12
Thomas Corcoran

sound - 4 views

courses.washington.edu/...NXT_testing.pdf

sound sensor

shared by Thomas Corcoran on 06 Dec 11 - No Cached
  • Thomas Corcoran on 06 Dec 11
     
    good for sound sensor
  • Declan Coen on 06 Dec 11
     
    it measures the sound at different locations and different distances
Andrew Drogan

Ultrasonic Senesor? - 4 views

Maybe, we could put the ultrasonic sensor on the NXT. We could put our fingers in front of the sensor right before the race would start. We could program the ultrasonic to go when our fingers are ...

started by Andrew Drogan on 06 Dec 11 no follow-up yet
Anthony DiVirgilio

Rear wheel drive vs. front wheel drive. Which is better? - 8 views

www.all-about-car-selection.com/rear-wheel-drive.html

wheel configuratoin

shared by Anthony DiVirgilio on 06 Dec 11 - No Cached
  • fwd holds an advantage in slippery conditions such as ice or snow as more weight is over the drive wheels reducing slip during acceleration
    • Anthony DiVirgilio
      Anthony DiVirgilio on 06 Dec 11
       
      rear wheel drive only has advantages where steering is envloved
    • Bryan Kelleher
      Bryan Kelleher on 07 Dec 11
       
      AGREED, BUT ARE WE GOING FOR PURE STEERING? OR POWER?!
  • Anthony DiVirgilio on 06 Dec 11
     
    this could be useful
  • ...3 more comments...
  • Thomas Helm on 07 Dec 11
     
    its really opinion but it does seem like a good idea to put it in the front
  • Thomas Corcoran on 07 Dec 11
     
    This could be very helpful for gear changing
  • Alexander Laferriere on 07 Dec 11
     
    these are real cars not NXTs
  • Joshua Wilkinson on 07 Dec 11
     
    thanks for pointing that out, i didnt want to say anything
  • Thaddeus McKeon on 07 Dec 11
     
    it doesn't matter the theory is sound
Thomas Corcoran

Odin, a robot for odometry - 3 views

www.philohome.com/odin.htm

shared by Thomas Corcoran on 06 Dec 11 - No Cached
    • Thomas Corcoran
      Thomas Corcoran on 07 Dec 11
       
      this is very helpful for the design
  • Declan Coen on 06 Dec 11
     
    this would be a rather complicated idea for our robot but we should figure out a way to have more weight like this one so it stays on the ground. we would need to lower the nxt brick so it does not tip
  • Alexander Laferriere on 07 Dec 11
     
    this looks good
Alexander Laferriere

NXT Inch Worm - 3 views

www.nxtprograms.com/...steps.html

shared by Alexander Laferriere on 06 Dec 11 - No Cached
  • Thomas Corcoran on 06 Dec 11
     
    possible design for the construction of the dragster
  • Alexander Laferriere on 06 Dec 11
     
    this looks loke a good idea
Anthony DiVirgilio

NXT® motor internals - 4 views

www.philohome.com/...nxtmotor.htm

shared by Anthony DiVirgilio on 06 Dec 11 - Cached
  • 10:30:40 = 1:4 9:27 = 1:3 10:20 = 1:2 10:13:20 = 1:2 Overall 1:48  
    • Anthony DiVirgilio
      Anthony DiVirgilio on 07 Dec 11
       
      useful for different configurations, good to know
  • Joshua Wilkinson on 06 Dec 11
     
    This shows us the torque of the motor. Yes we have 9 volt batterys, the bottom of the page next to a picture are some gear ratios.
  • Declan Coen on 06 Dec 11
     
    it shows how we can adjust the gear ratios to give the robot more or less power while driving
Anthony DiVirgilio

NXT Modular Test Vehicle (MTV) - 4 views

www.nxtprograms.com/...steps.html

gear ratio chart

shared by Anthony DiVirgilio on 06 Dec 11 - Cached
    • Anthony DiVirgilio
      Anthony DiVirgilio on 06 Dec 11
       
      this is the important chart from the website
  • Anthony DiVirgilio on 06 Dec 11
     
    good for setting up our ratios
Alexander Laferriere

NXT Voice Controlled Car - 4 views

www.nxtprograms.com/...steps.html

shared by Alexander Laferriere on 06 Dec 11 - Cached
  • Declan Coen on 06 Dec 11
     
    we could use this logic, when the sound sensor detects the sound indicating the start of the race that would be the starting condition for the program ps. i know that we do not use the same programming as in the picture
  • Bryan Kelleher on 07 Dec 11
     
    But what if people are speaking? you would have to set it to a certain frequency.
Lindsey Carlson

Using Shift Registers - 1 views

zone.ni.com/...usingshiftregisters

shared by Lindsey Carlson on 30 Jan 12 - No Cached
  • Lindsey Carlson on 30 Jan 12
     
    LabVIEW 2009 LEGO MINDSTORMS NXT Module Help When using loops, it is often useful to have a result from the last iteration of the loop for the next iteration of the loop. This can be accomplished using Shift Registers; shift registers will pass values from previous iterations through the loop to the next iteration.
Declan Coen

Data acquisition with NXT and LabVIEW - Robota - 4 views

robota.das.ufsc.br/...quisition_with_NXT_and_LabVIEW

data

shared by Declan Coen on 26 Jan 12 - No Cached
  • Declan Coen on 26 Jan 12
     
    it explains how the block diagram needs to be set up to collect data and then input it to the computer
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