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Contents contributed and discussions participated by Declan Coen

Declan Coen

Weight and Size - 0 views

started by Declan Coen on 17 May 12 no follow-up yet
  • Declan Coen
     
    You should add as much weigth as possible to make flpping harder. This will also give the robot more momentum. Also, a wider robot which is low to the ground is extrememly hard to overturn.
Declan Coen

Control From Iphone or Ipod Touch - 7 views

iphone control bot
  • Declan Coen
     
    There is an app called LegoDrive which can control an nxt bot via bluetooth.
    This app is on the Cydia marketplace and is available on "Jailbroken" apple products only. *Jailbreaking can do permanent damage to the Iphone or Ipod*
  • Declan Coen
     
    U can unjailbreak but you have to restore it. I recomend using it if you've "already" jailbroken your iphone or ipod.
    you could always back up your files before restoring. To me jailbreaking does more good than harm
  • Declan Coen
     
    some programs on it can be harmful. I had to restore my ipod three times
Andrew Drogan

Sumo Bot Design Suggestion - 11 views

  • Declan Coen
     
    i agree. the lower center of gravity makes it harder to flip over
  • Declan Coen
     
    ^ then it will be easier to flip the front
Andrew Drogan

Avoiding Falling off - 5 views

light sensor
started by Andrew Drogan on 17 May 12 no follow-up yet
  • Declan Coen
     
    I also think it is a great idea but when you are getting pushed over the edge, cliff detection most likely can't stop it
Declan Coen

Programming and Robotics - 2 views

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    the video shows that when the light sensor reads a certain value then it pick it up...
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    *initiates the motor to turn on which lifts up the object
Declan Coen

Advancing Robots Blog - 1 views

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    There are strategies here to build and use a sumo bot
Declan Coen

chowmillersumobots - 8 views

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    the robot designs on this page are possible for our criteria. the majority of them have a ramp like structure on the front for pushing and flipping
Bryan Kelleher

Line Detection - 9 views

Declan Coen

PID Controller For Lego Mindstorms Robots - 7 views

  • 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.
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    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.
Declan Coen

Building & Programming - LabVIEW for Lego MINDSTORMS Projects - 4 views

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    another possible program
Declan Coen

electricbricks » Line Follower in LabVIEW. State Machines - electricbricks - ... - 6 views

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    this is a possible way we can program the line folllower excluding the ultrasonic sensor
Declan Coen

Log Red Dataset - LabVIEW 2009 LEGO MINDSTORMS NXT Module Help - National Instruments - 4 views

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    LabVIEW 2009 LEGO MINDSTORMS NXT Module Help Logs Data from the specified sensor connected to the specified port. The data logging parameters are sample time and total time.For the Red Vis, the data is stored in the RedData.dat file on the NXT brick and can be viewed using the Data Viewer application.
Declan Coen

Data acquisition with NXT and LabVIEW - Robota - 4 views

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    it explains how the block diagram needs to be set up to collect data and then input it to the computer
Declan Coen

Logging Front Panel Data - NI LabVIEW 8.6 Help - 6 views

  • A waveform chart logs only one data point at a time with front panel datalogging
  • wire an array
  • chart indicator, the datalog file contains a
  • ...1 more annotation...
  • subset of the array the chart displays.
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    Shows how datalogging works
Declan Coen

NXT Voice Controlled Car - 4 views

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    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
Declan Coen

Odin, a robot for odometry - 3 views

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    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
Declan Coen

Free Lego NXT Mindstorms Robotics tutorial Climb A Mountain Use of gears Challenge 30 - 6 views

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    The bottom of this page explains how to create differnent gear ratios and how they work
Declan Coen

Sound sensor - 4 views

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    This shows how the sensor will detect sound and then transmit it to the nxt
Declan Coen

NXT Wall Follower with Ultrasonic Sensor - YouTube - 1 views

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    these people placed the ultra sonic sensor on the front so the robot will never lose trsc of the wall
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