Archive for the ‘mindsensors’ tag
LEGO NXTShot 2.0 – Cannon controlled by Mindsensors remote
[Correction: updated description]
Here’s another neat video that Tim found. It features a joystick that you can use to point its “missile shooter” towards a target. Here’s the description:
NXTShot 2.0 is lego NXT model cannon. Its targeting is driven in realtime by a Mindsensors Acceleration Sensor mounted on a remote. Its firing mechanism is powered by springs from old BIC pens. It has an innovative homing system that sets the limits for turning and inclining using a single light sensor. It has an onscreen menu system that uses a voice to give feedback on selections. It is programmed in ROBOTCC.
I have made plans of NXTShot using Google SketchUp and the fantastic NXT components provided by Payton White (see tinyurl.com/yw7tnw). More pictures of NxtShot can be found at tinyurl.com/2l7m2m.
ROBOTC with the Mindsensors NXTCam
The Mindsensors NXTCam can be configured to track up to 8 colored objects. It connects to an NXT sensor port, and reports the coordinates of each object to the NXT, enabling fast line tracking, color recognition, and object tracking. Watch this cool video showing ROBOTC and the NXTCam: http://www.education.rec.ri.cmu.edu/downloads/lego/resources/NXTCam/NXTCam.html
Sample code for Color Recognition:
#pragma config(Sensor, S1, camera1, sensorI2CCustomFast)
//*!!Code automatically generated by 'ROBOTC' configuration wizard !!*//
/*
Color Recognition - ROBOTC for the NXT
Description: The NXT displays the name of the color returned by the Mindsensors NXTCam v2
NXT Configuration:
- Mindsensors NXTCam v2 plugged into NXT Sensor Port 1
Camera Configuration:
- Color Index 0: Red
- Color Index 1: Orange
- Color Index 2: Yellow
- Color Index 3: Green
- Color Index 4: Blue
- Color Index 5: Purple
- Color Index 6: Black
- Color Index 7: Brown
Notes:
- As of October 2008, NXTCam color index must be configured through
NXTCamView, found at: http://nxtcamview.sourceforge.net/
- More information can be found at: http://mindsensors.com/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=78
*/
//Include NXTCam Library
#include "RAnxtCamLib.c"
//Define global variables
string colorName;
int numBlobs;
int_array blobColor;
int_array blobX1;
int_array blobTop;
int_array blobX2;
int_array blobBottom;
void printColorName();
task main ()
{
//Initialize the NXTCam
enableTracking(camera1);
wait1Msec(500);
sortBySize(camera1);
wait1Msec(500);
useObjectTracking(camera1);
wait1Msec(500);
//Recognize Colors Forever
while(true)
{
printColorName();
wait1Msec(100);
}
}
//void printColorName() - Writes the color returned from the camera to the NXT screen
void printColorName()
{
nxtDisplayString(1, "The color is:");
//Retrieves Camera Data
getCameraData(camera1, numBlobs, blobColor, blobX1, blobTop, blobX2, blobBottom);
if(numBlobs > 0) //If at least 1 "blob" or color is seen...
{
switch(blobColor) //...check the blobColor index.
{
case 0:
colorName = "RED ";
break;
case 1:
colorName = "ORANGE ";
break;
case 2:
colorName = "YELLOW ";
break;
case 3:
colorName = "GREEN ";
break;
case 4:
colorName = "BLUE ";
break;
case 5:
colorName = "PURPLE ";
break;
case 6:
colorName = "BLACK ";
break;
case 7:
colorName = "BROWN ";
break;
default:
colorName = "UNKNONWN";
break;
}
}
nxtDisplayString(3, colorName);
} |
