Let's Make Robots!

Finaly it's Done! - SkarkFun Graphics LCD Serial + Backpack Display


Woohoo, i can now control the display via 28x2, or via direct interface with visual basic applications which i create :D



Is it wrong to give your robot a little head? Or a big head for that matter? Gone are the days of my old, clunky teaching pendant for Walter's head. I have coded a … Read more
Navigate around a table top using IR
Using a
  I've had my Arduino for over a year and had done very little with it until recently.  Mainly because I didn't have the tools or knowhow to actually build … Read more

When robot programmers get board

Hi all,

I'm new here. I found this on Youtube and thought you might enjoy it.

NIOS by David HASLE I wanted a robot tank. I build this robot as a tank. It is equipped with 4 servos modified The actuators are fixed by cages at … Read more

Does LMR need a good prototype board?

Im thinking with all the things we make, a lot of times on a prototype board or some perf board, we at least deserve a good one that we agree has the layout we want. I think something we designed might be more useful than something like this http://www.mcmelectronics.com/product/21-4580&CAWELAID=220241321 or these http://www.sparkfun.com/commerce/categories.php?c=149 . Not to mention i prefer proper PCBs with traces and a solder mask instead of the exposed copper.

Just made my first SMD soldering

Today I made my first SMD soldering. This is where I started:

FT232RL and SSOP28 adapter

And this is what I ended up with:


Good algorithm for when to trust GPS speed and course?

In my testing so far, GPS modules that are locked in do a much better job in motion than sitting still. If I ride a bike down the street with a GPS, it will capture my route almost perfectly until I stop and then it gets "fidgety" and will jump around. Some modules do a better job of staying nearly fixed, but  I haven't had any that were perfect. The location data is still reasonably valid, but the implied motion throws off the speed and course reporting drastically. I need to come up with an algorithm to know when to ignore it but I need to start using it as soon as it is valid.

Arduino, holding wires in without soldering?

So I am building/ working on my robot, http://letsmakerobots.com/node/24204 and I didn't want to solder the wires into my arduino. Whenever I moved robot, the wires come out of the pins. Currently I am using scotch tape, I know not very professional. I was wondering if there is any other way to keep the wires from coming out?




Mr. General sensor issue.

After getting the kit together, Mr.General just wont do as supposed! When looking throu a camera only two of the infrared sensors led up? I have had a electrician look at my soldering and he could not find anything wrong.

When turning it on all green led's shine brigthly, but after a few seconds it starts buzzing from the speaker and the green led's starts blinking with the buzzing. If i then touch the wiring on the breadboard the head starts to tweak, and sometimes the green led's get solid again. Have also tried to change all the wires. Still the same!??

Please help!

Sending a int using VirtualWire

I've got the basic examples reciever and transmitter working sending the default "hello" message.

But I really want to send a int, for example 45 or another value over RF links. Can't understand how to rewrite it to do so!


Anyone care to help me out?


Reciever code:


#include <VirtualWire.h>

#undef int

#undef abs

#undef double

#undef float

#undef round

void setup()


    Serial.begin(9600); // Debugging only

Price: $14.95 USD

 Collected by one member
This triple-axis accelerometer is a carrier board for the Freescale MMA7361L XYZ-axis accelerometer, a great low-g sensor with analog voltage outputs and adjustable … Read more
A 3.3V voltage regulator! AMAZING! Read more

simple sound detection - headphone level input

So I have found a few different sound detection circuits, but they usually integrate a mic and an amplifier circuit. I want to make a circuit that takes in headphone or line level audio via 3.5mm jack that will close a relay when a sound is coming through the input. From what I understand headphone and line level audio has more power than mic level audio signals. The audio signal does not have to continue on to a speaker or anything after going through the circuit, and doesn't have to sound like anything in particular (can just be a series of tones and quiet periods)