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Stephen Brogan

LEGO.com MINDSTORMS : Products - SENSORS - 9843 - 1 views

mindstorms.lego.com/...9843.aspx

sensors

shared by Stephen Brogan on 13 Oct 11 - No Cached
  • 9843 9844 9845 9846
    • Joshua Wilkinson
      Joshua Wilkinson on 13 Oct 11
       
      is it posssible to use at least two of these on the robot, or is there not enough ports on the nxt
    • Thomas Helm
      Thomas Helm on 13 Oct 11
       
      im very sure that you can use more than one sensor but ill see if i an find something on it now
  • The Touch Sensor reacts to touch and release, enabling your LEGO® MINDSTORMS® NXT robotic creation to "feel" like never before! It can detect single or multiple button presses, and reports back to the NXT Intelligent Brick
  • Stephen Brogan on 13 Oct 11
     
    Interactive sensor database
Joshua Wilkinson

NXT Line Follower - 2 views

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

shared by Joshua Wilkinson on 12 Mar 12 - No Cached
  • When line following, the robot will try to align itself centered over the boundary between white and black (not centered over the black line), with black to the robot's left.  Here the brightness seen by the sensor is halfway between the black/min and white/max readings
    • Joshua Wilkinson
      Joshua Wilkinson on 12 Mar 12
       
      This would be useful since we get the value when its over the tape and table, we can also find the value of the sensor when its directly over the tape then the table seperately.
  • When prompted to sample the "Min" or "Black" reading, position the sensor so that the red spot is centered over the line and then press the Enter button on the NXT. When prompted to sample the "Max" or "White" reading, position the sensor so that the red spot is completely over the surface away from the line and press the Enter button on the NXT.
  • Andrew Drogan on 12 Mar 12
     
    Before line following using either the LineFollow2 or LineFollow5 program, you should "calibrate" the light sensor to the actual conditions expected. With the sensor mounted on the robot where it will be used, and the robot placed over the actual line it will be following, a calibration process takes two light sensor readings, one directly over the line (minimum = darkest), and one over the surface away from the line (maximum = brightest).
  • Declan Coen on 12 Mar 12
     
    if we follow the edge of the line we will always be between the max and the minimum values. therefore, it can detect both values and stay between the min and the max.
  • Thomas Helm on 12 Mar 12
     
    we have to figure out how to correctly calibrate the sensors
Joshua Wilkinson

iRobot Corporation: Customer Care - Service/Support - 5 views

homesupport.irobot.com/...what-are-cliff-sensors%3F

SENSORS

shared by Joshua Wilkinson on 13 Oct 11 - No Cached
  • equipped with four infrared Cliff Sensors that prevent robots from falling off stairs or ledges. The Cliff Sensors are located along the inside of the bumper
  • . If the Sensors become obstructed by dust or debris, the infrared signal is weakened
  • Joshua Wilkinson on 13 Oct 11
     
    how cliff detection works and what kind of sensors are used
  • Thomas Corcoran on 13 Oct 11
     
    this is good to know for when you need to pick a spot to but your sensors
Alexander Laferriere

Sensors - 4 views

legoengineering.com/nxt-sensors-2.html

nxt sensors

shared by Alexander Laferriere on 06 Dec 11 - No Cached
  • Jarid Brogan on 06 Dec 11
     
    gives info on sound sensor
  • ...1 more comment...
  • Alexander Laferriere on 06 Dec 11
     
    this looks good
  • Stephen Brogan on 07 Dec 11
     
    this is not very helpful. we already know about the sensors
  • Thomas Helm on 07 Dec 11
     
    Ya i agree we dont need to know about the sensors
Thomas Corcoran

NXT Basic-1: NXT Basic - Ultrasonic Sensor - 1 views

nxtbasic-1.blogspot.com/...t-basic-ultrasonic-sensor.html

Uktrasonic sensor

shared by Thomas Corcoran on 13 Oct 11 - No Cached
  • The Ultrasonic Sensor uses the same scientific principle as bats: it measures distance by calculating the time it takes for a sound wave to hit an object and return – just like an echo
  • Thomas Corcoran on 13 Oct 11
     
    basic review on the ultra sonic sensor
Anthony DiVirgilio

LEGO.com MINDSTORMS : Products - SENSORS - 9846 - 2 views

mindstorms.lego.com/...9846.aspx

LEGO.com MINDSTORMS SENSORS ultrasonic

shared by Anthony DiVirgilio on 13 Oct 11 - No Cached
  • Anthony DiVirgilio on 13 Oct 11
     
    this sensor is able to detect proximity
Thomas Helm

Sound sensor - 4 views

www.convict.lu/...NXT_sound_sensor.htm

shared by Thomas Helm on 13 Oct 11 - No Cached
  • Both LEGO™ NXT sound sensors were placed at the same distance from the speaker. A very simple LabVIEW NXT toolkit was run in debugging mode, in order to display the values on the PC screen and keep the NXT alive (Fig. 3). The frequency and the signal amplitude were gradually changed and the sensor readings were noted manually and entered into an Excel-file and also into a LabVIEW 3D-graph program (that we do not reproduce here). (Fig. 4 and 5) show the different graphs in 3D for the frequencies 100..1000Hz.
    • Anthony DiVirgilio
      Anthony DiVirgilio on 13 Oct 11
       
      we could use this to make the user have to do less to use the robot
  • Thomas Corcoran on 13 Oct 11
     
    Sound sensor with example code
  • ...1 more comment...
  • Alexander Laferriere on 06 Dec 11
     
    this is helpful
  • Declan Coen on 06 Dec 11
     
    This shows how the sensor will detect sound and then transmit it to the nxt
  • Bryan Kelleher on 07 Dec 11
     
    THIS WAS EXTREMELY HELPFUL
Alexander Laferriere

touch sensor - 1 views

www.robotc.net/...0with%20Touch%20for%20LEGO.pdf

sensor sensors Ultrasonic detection robot wall obstacle iRobot sound NI

shared by Alexander Laferriere on 16 Oct 11 - No Cached
  • Alexander Laferriere on 16 Oct 11
     
    this shows why using the tutch sensor is a good idea to detect walls
  • Declan Coen on 16 Oct 11
     
    it seems that the robot is using a sensor on top of itself. this can be helpful because it can detect cilffs faster but it will detect them too soon and turn away. therefore, it won't clean everything. in my opinion we should place the sesors in front and not on the top
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
Bryan Kelleher

LEGO.com MINDSTORMS : Community : NXTLOG - 4 views

us.mindstorms.lego.com/...DisplayProject.aspx

sensor

shared by Bryan Kelleher on 02 Apr 12 - No Cached
  • Bryan Kelleher on 02 Apr 12
     
    the way the ultra sonic sensor is set up is a good idea
  • Thaddeus McKeon on 02 Apr 12
     
    I feel the way they set up the light sensor is a little to far out
  • Joshua Wilkinson on 02 Apr 12
     
    we are gonna have to place the ultrasound or light sensor under three inches if we are following the inside walls, but thats an individule decsion. we could use a code similar to the wall following code in the romba project.
Thomas Corcoran

Read PING))) Sensor Distance VI - LabVIEW 2011 Robotics Module Help - National Instruments - 0 views

zone.ni.com/...skit_read_ping

Ultrasonic sensor

shared by Thomas Corcoran on 13 Oct 11 - No Cached
  • Thomas Corcoran on 13 Oct 11
     
    teaches you how the ultra sonic sensor works
Bryan Kelleher

Add an Ultrasonic (Sonar) sensor to ClareBot Lego NXT MindStorms Robot DrGraeme.net fre... - 7 views

drgraeme.net/...default.html

sensor obstacle

shared by Bryan Kelleher on 13 Oct 11 - No Cached
    • Thaddeus McKeon
      Thaddeus McKeon on 13 Oct 11
       
      also shows how to program in a different version though
  • Adding a vertical ultrasonic sensor to ClareBot allows the robot to go around an arena without touching the walls
  • Thaddeus McKeon on 13 Oct 11
     
    shows how to build a simple wall following robot
  • Bryan Kelleher on 02 Apr 12
     
    Although this is an older version, the placement of the Ultra sonic sensor is a good thought
Jarid Brogan

Lego Mindstorms NXT - Wikipedia, the free encyclopedia - 2 views

en.wikipedia.org/...Lego_Mindstorms_NXT

Ultrasonic sensors

shared by Jarid Brogan on 13 Oct 11 - Cached
  • Jarid Brogan on 13 Oct 11
     
    wikipedia article explaining the sensors for the nxt robot
  • Joshua Wilkinson on 13 Oct 11
     
    it says that it can take input from up to 4 sensors
Alexander Laferriere

wall following - 4 views

www.youtube.com/watch

wall followind sensors sensor obstacle detection

shared by Alexander Laferriere on 13 Oct 11 - No Cached
  • Alexander Laferriere on 13 Oct 11
     
    this shows the wall following in action
  • Declan Coen on 16 Oct 11
     
    this is a good design for our robot because it has the sensor on the side for wall following and it has a touch sensor on the front which tells it to turn
Thomas Corcoran

obstacle avoidance - 5 views

jvc.sagepub.com/...1077546310372004.abstract

obstacle

shared by Thomas Corcoran on 17 Oct 11 - No Cached
  • In this study, a path correction and obstacle avoidance method for a bipedal intelligent robot, using an ultrasonic sensor and electronic compass sensor, is proposed. The proposed method is implemented on an autonomous humanoid robot (the ARSR) comprised by the Lego NXT Intelligent Bricks. One ultrasonic sensor and one electronic compass sensor are installed on the ARSR to detect environmental information including obstacles, the distance to the obstacle, and the directional angle of the robot. Based on the obtained information, an obstacle avoidance and path correcting method is proposed to decide the ARSR’s behavior so that it can avoid obstacles automatically and move effectively to the destination area. Three obstacle avoidance experiments are carried out to confirm the effectiveness of the proposed method.
  • Thomas Corcoran on 17 Oct 11
     
    what to use for obstacle avoidance
  • Bryan Kelleher on 18 Oct 11
     
    I think this is a good idea!
Alexander Laferriere

color and light sensor - 2 views

digital.ni.com/...F4351695FC3A7386257707006E52EF

sensor sensors Ultrasonic robot detection wall obstacle iRobot NI sound

shared by Alexander Laferriere on 16 Oct 11 - No Cached
  • Alexander Laferriere on 16 Oct 11
     
    this shows how to use the color and light sensor
Declan Coen

nrqm / Roomba - Sensors - 1 views

nrqm.pbworks.com/...Roomba%20%E2%80%93%20Sensors

roomba sensors

shared by Declan Coen on 16 Oct 11 - No Cached
  • Declan Coen on 16 Oct 11
     
    it explains how some of the roomba sensors and accesories work
  • Alexander Laferriere on 17 Oct 11
     
    this will be very usefull to decide what sencors to use
Andrew Drogan

Single Sensor « The Roboticist - 4 views

www.theroboticist.org/...single-sensor

shared by Andrew Drogan on 12 Mar 12 - No Cached
  • Andrew Drogan on 12 Mar 12
     
    In this setup, a single light sensor is positioned on the robot and programmed to follow the outer-edge of a black line. We commonly refer to the robot executing a 'Z' pattern while following the black line.
  • Thomas Helm on 12 Mar 12
     
    a z pattern might not b the best idea on this because we have a certain time we have to do
  • Declan Coen on 12 Mar 12
     
    if we keep it between a very specific max and minimum then it will not zig zag as much and will appear to go straight
Thaddeus McKeon

NXT Line Follower - 1 views

www.nxtprograms.com/...index.html

sensor detection

shared by Thaddeus McKeon on 12 Mar 12 - No Cached
  • Thaddeus McKeon on 12 Mar 12
     
    yet another NXT line follower bot using the light sensor
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
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