Let's Make Robots!

compass

HMC6352 Compass Module in Continuous Read Mode

I have a need (desire?) to use compass heading as part of my PID loop to keep my rover heading true.  Using my well established trial and error coding technique, I was unable to get a sufficient sample rate from the HMC6352 Compass module using code I pilfered.. er... borrowed (I plan to give it back!) from the Interwebs.

position with compass and accelerometer

I'm doing a work to university.
I need to study diferents techniques of robot position.

Rover 5: how to determine direction with a compass (LSM303)

I recently bought a Rover 5 and an Arduino Uno and made my first sketches. My goal is to let the Rover drive standalone in our livingroom, avoiding objects, childrens and pets ;-).

Navigate via GPS, Compass, and avoids obstacles using 5 IR sensors
Using a
Hi all, I'm Matt and currently a junior in high school. I built first robot called the "A.S.R.B." over the summer for the Authentic Science Reseach Program and I … Read more
GPS Waypoints, Autonomous navigation
Hello LMR, This is one of my robots that I have been working on for a while. I have'nt posted it yet because I wanted to make sure I have a lot done. I use the … Read more

Weird Compass readings

Using this tutorial, I set up my new HMC5883l compass module from china onto my robot, and I had a simple program to draw the readings onto a circle.

Uses GPS, Compass, Gyro and Object Avoidence to Navigate
Using a
Hi, My names Alex McClung I'm 15 from Newcastle, Australia and this is My Robot. Read more
I started an new robot project which will be a long time project. The base is the 4WD chassies with 4 gear motors. The first stage is to attach the Dagu IR compound … Read more

dead reckoning algorithms / solutions

Hello All

Me again, flogging a (hopefully not) dead horse.

I wonder if anyone can provide links/guidance/code/insight into dead reckoning programming using the various (relatively) low cost components available to us.

I am thinking of things such as gyroscopes, accelerometers, magnometers etc. At this point I am excluding wheel encoders (since my vehicle is tracked and suffers from slipping tracks) or any form of external input such as beacons or gps etc.

Possible AGV

So I came across patrick's agv (http://letsmakerobots.com/node/18922) and his tutorial (http://letsmakerobots.com/node/19554.) and I remembered that I have a nice rc car. Once I learn more about robotics, I plan to build an Automated guided vehicel with the same compass and gps. Is this a hard build? 

 

Here is a video that I took of the rc car

cheap digital compass, does anyone have experience with it?

Hi LMR people,

Looking for a digital compass for my robot, I found this interesting Dual-axis Magnetic Sensor Module with UART& I 2 c Interface for $16.

link: http://www.sureelectronics.net/goods.php?id=958 and http://www.sure-electronics.net/download/DC-SS504_Ver1.0_EN.pdf

MY AGV development platform

 

I decided to do this as a blog as I plan for this to be a long term test platform as I mess around with different tech along the way.

OK I started by buying this RC truck chassis on eBay:

It uses a 7.2v NiMH battery and powers the motor using an ESC that delivers a few AMPs of 6v through a BEC to power a transceiver and the steering servo. Instead of a transceiver, I am hooking up an Arduino Fio and various components, housing them in a project box:

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?

 

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

  So you are interested in building a GPS guided vehicle? Well this is not for the beginner. This walk through does not hold your hand. I am expecting that you … Read more

AGV

Here is my AGV. It drives to GPS waypoints.  It is currently using a Arduino, GPS, and of course a motor controller. The bot itself is a Hummer RC truck from … Read more
    Is it possible to make a compass from something that was designed for something else and to do it inexpensively? We shall see!     Goal: To make a robot … Read more

Homemade digital compass

Some time ago OddBot posted this circuit for a homemade digital compass based on hall effect sensors:

Compass_Schematic.jpg

Unfortunately CircuitBurn couldn't make it work. However I'm inclined to try again. A cheap DIY compass would be great.

So if anyone has ANY idea as to how this could be achieved let's hear it. It could be an improvement on OddBot's circuits or something completely different and wacky :D