Let's Make Robots!


How many 9g servos can an USB handle.

I need some confirmation to be sure - USB 2.0 can supply 500mA, and typical small 9g servos draw like 150mA, right? That means it's safe to have an arduino powering 3x 9g servos, running off an USB port..?
Also, how important is it to have an electrolytic capacitor in the start of power supply chain, to store current? At least in this particular case - how much will it help protect the USB port? Or if all motors are stalled, capacitor will run out of stored power, and the USB port can still be damaged?

RS-232 Wireless comms with XRF radio

Hey peeps

My first post in a very long time...

I've got a project on the go at the moment, gonna post it as a robot soon, which is a robotic dragon quadruped called Dimitri (not sure why, but I like it)

Since an Arduino isn't clever enough to do all the things I'd like this robot to do, I'm gonna have most of its brain inside my laptop and communicate wirelessly.

I'm having problems getting a connection with my current setup, here's a photo:

Trying to get Torobot USB servo controller to work with BeagleBoard


I have a Torobot (24 I think) USB servo controller which takes text commands and converts them to servo controlls.

I am using a Beagleboard XM (not the Bone) with an Angstrom distribution on it.  I am having a hard time accessing the board programmatically and have tried several approaches.  The board itself is fine, I'm just trying to send it commands.  The Python API seemed to be the most straight forward, but, of course, there are a lot of depencies I'm fighting with.

USB Microscope

I got myself an Andonstar USB microscope of eBay and must admit that I’m pretty impressed with the resolution and magnification.
It is a great tool for inspecting SMD soldering joints and the kids had great fun with it this exploring small insects and flora this summer.

So if you’re wondering what to get yourself this Christmas, this might be it.

Some pictures from the microscope

charges all the devices via USB (phones-mp3s-iphones) where there is no power
Let us suppose that you want to charge your phone outside the house where there is no power the I Super USB charger is the device you need.It remplaces the PC's or … Read more
An iteresting light show
A modified USB flash drive. I added 2 multicolored IC controlled LEDs from a Thermaltake 120mm PC Fan. The LEDs are linked in parallel and are in series with a … Read more

Code Post - Interfacing Arduino and Python

This is something I've done by hand at least ten times and always seem to lose it so I've decided to post it here. It is an easy way to debug and test stuff will developing software for the Arduino (or any Microcontroller really). There is a python code that sends string messages to the arduino over serial based on which arrow key on your keyboard is pressed. There is also an Arduino code that listens for these messages, then repeats the message back to the PC to make sure it went through.

Can I replace this camera's usb cable?

I have an eyetoy camera that works very well with my raspberry pi. However the USB cable is long as hell and there are five cables coming out of the camera into the USB. My shorter cable that I want to use is the standard 4-wire one. I suspect that there might be some sort of converter contained in the camera's cable, and that replacing it would be impossible. Here's the camera, and notice the lump at the end of the cable. What do you guys think?

Now available from PicoKit!http://www.picokit.com - A cheap and simple 3 servo robot walker that anyone can make for under $40. My students in Industrial … Read more
Allows my robots to communicate wirelessly with my PC.
Like many of us, I've been working quietly on my next robotics project.  Along the way I wanted to be able to wirelessly monitor what's happening deep inside their … Read more

Lego Mindstorm C# USB

Hi there,

I have a quesiton to those of you who are familiar with Lego Mindstorms NXT brick and also C#

How can I transfer a robot C file I have created to the brick, via USB, using C#?

You don't have to give me code just point me in the right direction



Can I stream a wireless camera through wireless usb?

I was thinking of wireless cameras since the beginning of time and I've finally come to the decision of buying one. For me, there are two options: a camera that transmits to an rca/composite 2.4Ghz receiver which in turn is connected to a rca/composite to usb converter, or a camera that transmits to a 2.4Ghz USB receiver. In both cases, however, it seems like the stream must first be recorded by some program and that doesn't really fit useful applications for robotics. I want to process the data live with OpenCV and then relay information to the robot.

Where should I start with wireless robot-to-computer data transmission?

I'm working on a project where my bot collects some information while traversing a grid. I want to send the findings back to my computer wirelessly as the robot is moving. The range is not far (2-5 metres) and I am on a budget (Up to $20 but the lower the better).

The data I need to relay needs only be three sets of three single digit numbers. I could even condense it to be three 3 digit numbers or one 9 digit number I suppose.

Arduino servo


I tried to build a photovore using and arduino and tested it via usb cable,so far so good the system worked as intended as soon as i plug my battery via the dc connector the servo worked but extremly slow why?

Displays the time in binary
Hi, this is a binary clock that I made for fun out of a Teensy 2.0, some 3mm leds, and RTC, and a 3D printed shell. It displays the current time(in 24-hour … Read more

Unknown Scart device

Hi LMRians. 
I need a little help identifying an unkown piece of tech.
If any of you know what this is i would be very appreciative. 
Scart USB 

Babblebot USB board works, sort of

I purchased one of these voice synthesis chips as kind of a knee-jerk reaction to Maxhirez's bot but I didn't know that they were so finicky and questionably documented. It seems the nature of breadboards cause a lot of problems with this chip as well, some of which I am very familiar with. With the challenges presented it seemed best to design my own PCB and have the pro's through Dorkbot fab the board. I would have considered buying the dev board from the Babblebot guys themselves but it only comes in RS232 flavor!

CNC control from a laptop

I've put this in ideas cos I'm not sure where it fits, but the project itself is still in the ideas phase so i think it's ok :D

Basically I'm slowly assembling parts and designs for a CNC milling machine, the usual xyz stepper motors with router on top sort of thing.

What I'd like to know is if it's possible to control it from a USB-parallel converter, I've read some things about the interpreting speed not being up to it (All I have at the moment is a laptop, so no parallel port)

Picaxe - USB

I'm working on a new robot and i want to control it with a usb-keyboard,

How can i connect a usb to a Picaxe 28x1 projectboard?

And how can i program it?


Adaptor for extending USB cables
Is your USB cable to short.............. ..... then look no further here is the ideal solution.... using your printer cable (as they tend to be extra … Read more
This is modullo, one of my first elaborated robotic platforms. It hasn't got an actual purpose yet, I'm at the stage of adding various sensors and integrating them … Read more

Make Your Own PICAXE USB Program Cable

Hi everyone!

I was just wondering if anyone else has made their own PICAXE program transfer cable?

I had all the equipment to make one, 2.5mm stereo jack, colour coded wire, a usb plug and soldering equipment; so I thought i'd give it a go!

The connections for the PICAXE cable seemed very simple (having only Serial in, Serial Out and Ground) and knowing that a usb's connections were quite similar (Ground, Data+, Data- and Vcc) so I tried to match them up.

'LMR Start Here' USB trouble shoot

my computer does not recognize the usb cable, i cant get the program to find it, ive downloaded the proper driver software and updated the port containing the axe027 (debatable). all ports are 'not available' please halp!

Picaxe USB driver issue

I have just received my Picaxe 28X1 Starter Pack and, after an hour of trying, am still unable to install a driver for it. I am running Windows 7 Ultimate, 64 bit on an AMD Phenom II X6 1035T at 2.6 GHz (or so they say). I have tried the self-extracting, self identifying driver, I have tried the manual install. I am not getting anywhere... well, nowhere good. I have combed the rev-ed site. I assume that the driver was included on the CD I got with the starter. It seems likely that I am just missing something obvious.

Any advice will be appreciated. Thanks!  ~Allen

Light wieght Desktop Automation- Intelligent Find Pick and Place
Using a
Humanoid Robot: Human Motion Capture and Replay This is a series of clips showing the development of robotics at DesignFeats We also hope to complete our powerful, … Read more

USB for Mic jack

So a friend recently asked me if it would be possible to replace the USB jack on a set of headphones with a Mic jack so it could be plugged into and ipod. I said I wasn't sure. I know it isn't really robot related but it was an electronics question and I figured this was a good place to ask it. Thanks



Bought one of these bad boys from -Adafruit- yesterday!

USB native hehe! but not here yet. (of couse used USPS first class)

need a bit o' help though. i want to get those .HEX files after Arduino compiles them. I am on a mac. where are those hex files?

tried searching  but, no luck probaly in .tmp folder :p.

Any help would appreciated!





Using an RF receiver/transceiver pair along with a wireless camera to process the images and send commands to a mobile robot

I would like to create a setup I will be using for a lot of my upcoming robots. A small wireless camera that will be ultimately outputting through USB to my computer. The computer processes the video and sends commands to the robot via RF. I guess the serial connection will be no more than 1900 bds. How can I coordinate RF and image-processing in a single program for autonomous navigation/other tasks (I can almost hear GroG saying "MyRobotLab" ;)?

pins specification

i need to know the pin configurations of usb,serial,and parallel ports of a computer.....someone make me understand about the micro processor DDR,registor,address,etc evrythig related to a micro processor..