Let's Make Robots!


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Nunchuck resolution problem to control a remote rover ?

Hello all,

With a home made remote control console with 2 gimbal joysticks  (similar to the Parallax : 27808 item and a small lcd screen, i control via a arduino Uno and xbee a rover with no problem.

Since i wanted a second controller wich i could hold in one hand i adapted a Nunchuck to control the same rover also with a arduino Uno and xbee and a very simpel protocol.

Arduino code for proportional speed, using cheap RF modules results in erratic robo-behaviour

Hi All,

I have been stumped on this programming or hardware problem for many days now, and hope i can get some assistance to get things up and running.

father and 9 year old son newbies HELP


My son and I are interested in building a robot.  Max has built several Lego robots, but is interested in building from scratch.  I am an artists/woodworker/metalworker, I run a lab with 3d printers, Laser cutters, CNC etc and am comfortable with digging in to this kind of project.  We need some guidance as to where to start and a bit of a plan.

This is a father son project and a way to help Max focus on something he picked, understand goal setting and follow through. 

Arduino Mosfet Control

Hi Everyone.  If someone could answer my question I'd sure be thankful.  Unfortunately I am a little sparse on details because I'm away from my work bench.

two Ultrasonic sensors. would they conflict?

Im thinking of getting some ultrasonic sensors for my platform, to play with. I was thinking i would have one on the chassis, pointing forward for contact detection, and then one on a turret for mapping distances to plan a route.

Would the two get confused by each other?

I guess it would just mean you would need to make sure that they work seperatly, with a percievible delay inbetween using one sensor, then another?

or is it not an issue at all?

Clubs in UK

I want to build an autonomous mobile robot with wheels or tracks, vision, arms and carrying ability (for example a tray area) that can navigate in a flat inside or outside domestic environment (not both).

I am UK based, have some old OO programming experience and general PC -based programming experience but no electronics expertise apart from basic school physics . 

I work full-time so this would very much be a part-time project.  From looking around I'm thinking of perhaps using ROS, OpenCV and maybe Arduino components but would like to know

DC Motor

I am totally new in  robotics. I want to track a person walking in a certain track, please suggest me how can i select the DC motor like gear dc motor or servo dc motor, i also want to use the encoder and also please suggest me how to select approprite voltage and RPM of the motor. in addition the motor control driver best suit for that platform.

thanking you all in advance.




Recruiting friendships

Hey everyone!

Sorry if my english isnt 100%. English is not my main language but lets give it a try anyway!

My name is Jonas, im 30 years old and educated ASP.net developer. Reasonly i found making robots very satisfying and wish to dig more into this hobby. But i would really love some backup, a network, someone to lean up against and therefore i would like to ask if anyone could be interested in sharing skype info.

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':