Let's Make Robots!

sensor

Environment mapping

I'm currently working on an application for mapping the environment with a range sensor. Right now it's only a sharp sensor (GP2D12) mounted on a servo that is turning slowly, while the readings and corresponding servo angles are being sent constantly to my PC via serial. The program then converts the angle and distance to x/y coordinates and draws a map.

What distance sensors are better and best?

I am working on a much faster & stronger version of Robot Wall Racers, using quite fast RC-cars

I want to use lasers as distance sensors, but I think they will be a little over budget, altough this is a paid for job :)

Yes, SRF05's clai, they can detect a broomstick on 3 meters.. but in reality they are not stable before say 1.5 meters.

1.5 meters when you are traveling at 25km/h is NOT a lot, when you even are set up with drifting tyres.

Price: $2 USD
A retroreflector is basically a mirror that reflects light back directly to its source no matter the orientation. It basically can take a light source of any angle … Read more
They will be packed as 5 sets with four different colors(red, dark blue, black and two silvery ones). Thanks for the effort from Oddbot, Robologist, Frits and … Read more
touch sensor with colour changing LED
These whisker/antenna sensors work like normal touch sensors but change colour when they touch something. The first video is my original prototype using a single … Read more

What wrong with my code???

#include <Servo.h>

Servo myservoL;
Servo myservoR;
int myservo = 2;
int myAngle;
int pulseWidth;

void setup()
{
  pinMode(myservo, OUTPUT);
  myservoL.attach(9);
  myservoR.attach(10);
}

void servoPulse(int myservo, int myAngle)
{
  pulseWidth = (myAngle *10) + 600;
  digitalWrite(myservo, HIGH);
  delayMicroseconds(pulseWidth);
  digitalWrite(myservo, LOW);
}

  Suitable for ASURO kits and any other kits   Part list: Read more

using a microphone as sensor

I have a couple of headset microphones, and I would like to use them as sound sensors..

I tried to amplify the signal using LM386, but it doens´t work.. can someone help me on this?

diy multi touch input = interesting sensor

Two sets of copper wires in opposite directions, separated by a layer of rubber. When pressed, the two wires respond to eachother as the two plates in a capacitor. The harder you press, the closer the "plates", the higher the capacity of the "capacitor".

Eight wires per set, sixty four permutations. Watch this video for the explanation by the maker himself. (Vimeo does not embed on LMR)

Temperature Sensor?

Ok,

Right now i am planning to build a autonomous robot that puts out fires. It will go up to a tiny fire (about 4 inches) and then drop a tiny bucket of water (2 1/2 inches wide, like the ones that came with the old version of robosapien) on the fire. The bucket will be put on a platform attached to a servo. when the servo turns the bucket will pour. I am going to do this all with picaxe. I know how to use picaxe, and coding in basic.  Anyways what my real question is, Is there a type of sensor that i could use to find the fire and stop before it? Could I use IR somehow?

Wicked motion/location sensor

Not cheap, no howto, just a commercial product. But great inspiration.
Detects objects at close range. Can be used for object tracking.
Now with video of the sensor being used as a Mintvelt inspired object tracker! This sensor is a short range obstacle detector with no dead zone. It has a reasonably … Read more

TPA81

Hi,

my first question for my first robot. Someone have some experience with the TPA8 sensor?

In your opinion, can I use this sensor to build a bot able to find - for example - some human?

thanks

Help with IR Sensor LED020 (UPDATED)


Attached are photos of my circuit on a breadboard.

 

UPDATE IT WORKS!

I posted a video. Ignore the TV in the background. When the universal remote sends a signal it is decoded by the PICAXE (not done manually I found a setting that the sensor can read and decode itself). A LED flashes to show a signal was read. It then shows the number of the code that was sent in the debug window. In a few days I will delete this post and add a turorial. Then its off to making my robot WOOHOO.

workin of ultrasonic sensor

can any1 pls xplain d working of ULTRASONIC SENSOR?

or working of anyother environment independent sensors? 

Make a robot sense stuff in dark or light conditions.. guided by visible light
Update: I am tired of it being named "FritsLDR", I cannot post to people "Try using FritsLDR", it is just too self centered. And I would just love to see some more … Read more

New ways of seeing things..

Hi all, I am so excited about this. It may not be much to anybody else, but to me it is!

You all know how we only have the IR's or the Ultra sound to work with when we want to check distance? Yeah, if we have millions we can also get a camera or two, and laser range finders..

However, I wanted something cooler.

This is not that, I am sorry.

However, I am working on something cooler (I hope, but it may be far fetched), and when doing so, as a spin off I made this. 

And it is pretty wicked, I think.

IR Versus Ultrasonic rangefinder on grass.

Hi, I'm pretty much new to robotic, even though I've worked with kit like fischertechnik and Lego NXT.

I know the base of it, and i'm good with electronics.

 

but here it is i want to build plane that coud fly by itself using rangefinder (Ir or ultrasonic) to keep a distance from the ground, but i've read that IR sensor aren't good outside and that ultrasonic doesn't work good on absorbant material (Grass).

Since it's a plane I also have to consider weight in my choice.

Wich sensor would be the best for this task ?

optical mouse as a sensor

I need help in using an optical mouse as a sensor for my mini-sumo. i read from some place that it could be used to let the robot know that it is slowing down and will react to it. Does anyone know how i could use a mouse to do this?