Let's Make Robots!

sensor

Uses the servos potentiometer to detect resitance on a gripper.
Using a
I soldered a wire to the middle pin of the potentiometer inside the servo that operates my gripper. Using an analog pin, I can tell when the Servo isn't moving. I … Read more

ir sensor and ultrasonic

hay guys me again!

just wondering what the pros and cons of both of these sensors are and the one i should use in my first project.

sensor jitter problems? Let's fight back.

I wrote a tiny function in Arduino-C for my sensor-jitter problems. You can smooth out your sensor readings with this little function. You can input the smoothness and then get back the smoothed sensor value.

If somebody needs it - here it is:

// Jan Przybilla, Rosk, Farbtonstudio.de
// SSR - Smooth Sensor Readings
// Fight the (((Jitter)))!

Pinhole camera - technique used for navigation?

Playing around with a small project, of a time-lapse-recording that should track a cloud in the sky, I got to think of Pinhole cameras - and I was thinking if any one had tried to play with the technique

RC car

Ok, so I'm working on a plan to bring my little brother's little Niko RC car (you know, these models that suddenly break down for no reason at all after three charges) back to life. The plan is:

  1. Yank out old electronics (fun job, done ^^)
  2. Test steering servo and current draw of drive motor
  3. Build new electronics

Step 2 will be done by tonight but I have a few hickups on step three.

SI1120 Sensor working

Developed the code some more to determine which side and how far an object is. The green LEDs signify whether or not either side detects an object. The yellow LEDs signify which side the object is. Lastly the red LED indicates of the object is really close.

http://www.silabs.com/products/sensors/infraredsensors/Pages/Si1120.aspx

 

Measures the alcohol in your breath and marks the highest for a competition with your friends
Hi, this is my breathalyzer project. It's just something fun that I have been wanting to make for a while now. It uses an atmega328, alcohol gas sensor from … Read more
guide light, conduct air, be tubey
When your project, like mine, needs a tube pipe to fit exactly around something, consider making your own. I could not find anything with the exact inner diameter … Read more
This is the fully functional test chassis for my Arduino based sumo robot. It will be competing in March, 2011. For the prototype I am using a piece of plywood to … Read more

Sharp IR sensor Broken?

For some time now ive been trying to get m sharp ir sensor to work with my arduino.
its all plugged in and fine but no matter what is infront of it the data will keep bouncing around 1000.

................................................................................................

OPB704 Line Sensor

Intro:

I have received questions regarding the line sensor that I'm using on my mini sumo bot. Here I will post the schematic and pictures of the board. 

The OPB704:

Homebrew tilt compensation?

Honeywell's datasheet on the HMC6343 compass states that tilt compensation is made using data from a built-in three axis accelerometer. I thought that a cheaper three-axis magnetometer- accelerometer combination is much more reasonable for small scale projects, so my question is: What kind of calculations do I need to perform to get a decent degree of accuracy?

 

What parts to use for the next LMR Start Here robot

As you may have seen in the LMR Live Show, we need a replacement for the Sharp sensor used in the Start HEre kit, as the sensor used till now is no longer being produced.

On http://letsmakerobots.com/node/22657 a lot of really new and interesting sensors came to my attention.

Now, since I am going to do a whole ned version anyway (we cant have instructions with images that doesnt match), I was wondering if there would be other parts that should also come in to the modern times?

8$ compass

4 weeks ago i ordered the dc-ss503 magnetic sensor module with tilt compensation, and i'm now trying to interface it with arduino. so far i have obtained the 4 values from the i2c bus, but i can't understand how to actually get a heading from it. this is the datasheet i found, which i know is the right one: http://gongxue.cn/lixueyuan/UploadFiles_8285/201004/2010042114001679.pdf .

does anyone have any experience with this module and can possibly help me? thanks

Navigate around while avoiding obstacles with ultrasound, infrared light and air pressure based bumper sensors.
Using a

My first robot..........

So I've decided to build my first robot which not the LMR "start here" one (that one is going to be my second one) and im using this circuit- http://costaricabeam.solarbotics.net/Circuits/Vores/555%20Photovore.png . I've tried about 10 different designs for the body but its just not working. When i cover the left photocell with my hand and the other one is exposed to light the speed of the motors is the same and same with the right photocell. has anyone tried the circuit? did it work?

perfect for putting components like CNY70 in place
Good tip on how to place sensors on your robot is by using old cables that are probably laying around the house of most people interested in building robots at … Read more

Infrared Proximity Sensor

I have a Infrared Proximity Sensor. Is there a way to debug the distance so I know how far I want it to detect something. I always see people's codes have 400 and 700 and I'm like where did they get those?

XMOS based XC1 robot which tracks your hand

Just happened to find this on youtube. Is not by me, but is a cute video none the less so I thought I would share it:

Cute little XMOS XC1 robot

Super Capacitor in solar power supply - a few queries

I intend to build a remote 'weather station'

The station will:

  • Be completley independant of any external power, ie, it will produce its own power via solar cell(s)
  • Measure temperature only
  • Transmit its finding over an RF link to an indoors reciever

Instead of using a rechargeable battery supply with charger circuit, i have decided to use a 35F, 2.7V super capacitor to smooth and store power.

Force sensor

I've already been 'bitten' a couple of times by waiting too long to write about things, so I'm going to try to post about things when they come to me.

Plays musical notes using a non-contact LED stylus.
This is 'Allura' - a small synthesiser I built as a platform to test out a few techniques for another project in progress. Read more

Ultrasonic sensors and pets

Hey all. I'm thinking about building my first robot. Was hoping to build some kind of wheeled monstrosity with lots of sensors, but I beginning to think using ultrasonic sensors might not be a good idea with a cat in the apartment. Does anyone know how pets react to the ultrasonic signals?

AXE 045 RGB sensor

HI,

 Does anyone around here have any experience with the AXE045 RGB-sensor from Picaxe? I connected it to my Picaxe 28X1 microcontroller and I am only able to get readings from about max 40 for red and blue, green only gets to one or, if I shine directly into the lens with a flashlight, up to 9.

 Any help?

 

Greetz,

MG2R

The Accel_Gyro Board represents a 5DOF Inertial Measurement Unit (IMU), capable of measuring acceleration on all 3-axis as well as measuring rotation rate around … Read more

Robust Autonomous Robot Localization Using Interval Analysis

hi


i'm gonna do my project on autonomous robot.... and i got a ieee abstract.....

here goes....

Abstract :

Has anyone heard of this Ultrasonic Sensor?

The model is SP-40-38F. You can find it here: http://www.cutedigi.com/product_info.php?cPath=278_295&products_id=4282&osCsid=d133de8082a4556d02f27cdf248ae912

I would like to buy a few but after looking at the site, I am a little hesitant to send them any money.

Thanks,
Brian

laser pointer and a 38khz sensor

would it be possible to make a laser flicker at 38khz?

I was thinking; if I had a modified laser that gave me a red dot that pulsed at 38Khz. If a robot was made to go towards a 38Khz beacon...

I thought this might function as a intuitive remote control.

The robot is programmed to do whatever, map its surrounding, search for metal or filming the girls gymn locker room. But when the laser is pointed anywhere in its vicinity it'll start following the red dot until the laser is switched of again. then it will continioue its original task.

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.