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How to control a two motors and encoders in a single function?

Dear: LMR

Just to let you know I am trying to control all my robots motors and encoders in a single function. It is not going so well obviously since I am starting a forum. This code is supposed to work that function void move has parameters that are leftMotorSpeed, rightMotorSpeed, leftMotorDistance, and rightMotorDistance. Left and Right motor speed control the motor's speed. The other parameters represent the number of ticks the motors are supposed to tick. When they reach a certain amount of ticks the function returns. As should the loop function.

Getting data from gps module GTPA010

I bought  a gps unit i've never thought of trying out and this morning i wanted to get my geolocation!

I got my GPS from here MicroGPS Module

Bellow is a diagram of the gps unit and its pinouts for the with arduino and probably mbed too








Talk to my computer through Serial?

Long time no see LMR!!!!

This semester was my most brutal yet, but the rewards have been priceless!


Anyways, back to the robots,

So my current project is to create a virtual indentity that I can have a VERY simple conversation with. His name is Sergei, cause everyone needs an awesome Russian buddy. But I find myself being a bit stuck on one thing: Serial Communications


What Im really trying to better understand is how to make the Arduino respond to my serial input. 

Let's Replace DCC (Long post)

I need to build a small robot. :-)

I guess the first goals are:

1: The robot needs to be powered by 12 volts direct current via rails.  In spite the direct current label, the power feed must be rectified as the robot may end up "turned around" on the power system or may be coupled to another robot that is "turned around."

2: The robot needs to be able to accept inputs via WiFi.  These will include control inputs.  Ideally, this would be coupled with a small camera that can send back it's video via WiFi.

Arduino code - switch statement

Hi, I code a program for my autonomous robot. I am sending numbers from 0 to 8 from Raspberry pi to Arduino through Serial communication. I have Rasp code. But arduino code has some problems. Please can you tell me how to write it best? I want to use switch statement to choose direction for my robot/motors. But when I compile that code to arduino on robot - my robot start doing only default commands. Please why????


Is there a contemporary Brushless-capable tracked platform?

Hi All,

Doing a recent build with a tamiya track and wheel set (with double gearbox and universal plate) got me thinking, is there a tracked platform out there that can (or be made) brushless and withstand or be capable of high speeds?

OpenCV problem

Hi, I download and install OpenCV 3.1, but when I want to start a code it wrote me back this

CMakeFiles/camera.dir/camera.c.o: In function `cvPointFrom32f':
camera.c:(.text+0x7a4): undefined reference to `cvRound'
camera.c:(.text+0x7bc): undefined reference to `cvRound'
CMakeFiles/camera.dir/camera.c.o: In function `cvReadInt':
camera.c:(.text+0x1378): undefined reference to `cvRound'
CMakeFiles/camera.dir/camera.c.o: In function `cvEllipseBox':

Suggestions on a motor type

I am a prgrammer who recently got into robotics. As I was going through the plans for my robot I got stuck on what sort of motor (how large of a motor) I need for the project and where to get one. The project I'm working on will weigh around 100 lbs. (This is a larger robot) and will have to side motors each power a drive wheel for a "tank track" system. I want the final revision to be able to move at most around 3 mph countinously and be able to move in all directions (including reverse) So what type of motor should I get and how big of a motor do I need for this sort of project.

Merry Christmas and so on and so forth.

Not much happening here. Still working  figuring out the code for my 12 servo biped, meanwhile I bought myself a cheap Mindstorms NXT set and figured out it could be a fun challenge to make a proper walking and turning 3 servo biped! But, that one has to wait until next year or so also. Too many hobbies, too little time...

Anyway, Merry Christmas and a happy New Year. That is: if the little totally non robotic Christmas wish video I made pops up properly.


unique project, in research mode

Hi, I have 0 background in engineering nor robotics. I have a project requiring both, so if you can help at all or give good feedback that would be very appreciated.


The true reason behind my project is a bit secretive for me, purely because I think it’s a smart idea and I don’t want the idea getting out there until it’s complete. So, for the purposes of this thread, I will fabricate the purpose of the project (yet the mechanics will be EXACTLY the same necessary for the true intent).



Humanoid concept Arduino

This concept to make a humanoid head, that speaks like a human, chooses phrases randomly. As (it) speaks , it moves head, eyeballs and eyebrows randomly in an emulation of a human. This can be useful for lonely people who cannot have a pet at home.

This is the basic idea..Later it is possible to develope it further to talk longer durations, and even tell short stories stored on an SD card.

3D printer for hobby robotics

I am getting into hobby robotics, and I am finding that I more and more am in need of the ability to create custom parts.

What would be a good 3D printer to buy (couple grand max cost), for creating parts such as: chassis, wheels, servo armatures and holders, gears, etc.

For me one of the most important things to be able to make would be my own custom gear trains.

What would be a good 3D printer, precise enough and using tough enough materials to great gears for robots on the size scale of a cat. Such as differential wheeled, hexapod, and quadrapod platforms?

Books about starting an RC toy company?

Hi All,

I'm looking to find information/books on how a person would go about starting an independent RC toy company.

Robotics Literature

Well I am the epitome of the word "beginner" when it comes to robotics, electronics, mechanics, etc. and I wanted to know which books or magazines one would suggest to a beginner with absolutely no mechanical background. I've heard things about "Robot Builder's Bonanza" and The Evil Genius Series, but I've also seen comments that these books can be hard to follow without an understanding of some electronics. I am still in High School if that will narrow down any suggestions. Thanks for your help.

Using Hall effect devices to detect distance from magnet.

Hi Folks.
I have been searching for this on Google but have not yet found a decent example.

I have a small neo magnet that is on a flexible surface - lets say under a  bandaid on an eyebrow.

I have a hall effect sensor mounted 10 to 15mm above the magnet on the forehead. It is actually mounted in a mask sitting on the forehead so that the skin movement does not effect it. So it will be a fixed reference point

Building a wild thumper GPS enabled Raspberry pi Robot Serial vs I2C

Good morning,

I am trying to build a GPS guided wild thumper. I have invested in some hardware and have been mucking about with it for a while now. But to be clear, I am a beginner.

This is what I have:

-Raspberry Pi 2 with a NoIR camera

-T'rex Motor controller (Dagu)

-The 4WD Wild Thumper Chassis

-nRF24L01+ radio controller x2

-Arduino nano


-A Couple of SR04 Ultrasonic distance units

-A Battery 7.4 LiPo