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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!

  First place and congratulations to Kelpy with his  LMR Bot Clone (ish):   Read more

Busy bees... see quads at work

See the quads at work, they are doing better than a crane...

Capacitors

Hi y'all, just joined LMR, fantastic site, lovin' it already . . .

 

I am a bit of a beginner to robotics, I mean I can program and all that, and make these things, but I know not how or why they work.

One thing I have been wondering is about capacitors:

When designing a circuit, how does one know where to place capacitors, or why to have them, or how they function in that position?

With this circuit in particular (from here: http://letsmakerobots.com/node/2074), why the caps?

those two in the top-right, why do they both need to be there?

Simple object avoidance
Using a
UPDATE 24/1/11 New video added of the thing actually working. I could spend forever tweeking the code, but at least I know that it does what it's supposed … Read more
fires when something is too close
Using a
Usb powered proximity sensor motorized arm light pulses gun bicolor eye lateral led indicator changing states Read more
I was inspired by Chuck McManis and his BJT-based H-bridge tutorial and I wanted to build a similar H-bridge based on MOSFETs. The design goal was for the H-bridge … Read more

Making parts

I spent Thursday night making hubs for new robots.  Enjoy the video.

Picaxe code

Hi all,

I've been busy over the past few days studying the Picaxe manuals and trying to understand the coding. I keep reading about how easy it is and it's even called basic, but my problem is, I don't understand any of it.

My electrical and mechanical skills are enough to get me by, but this programming makes no sense to me what so ever.

I've Googled in an attemp to find online tutorials, that doesn't seem to help either.

Can anyone explain how they learned the Picaxe basic coding? That might help me.

Thanks,

The Bromz.

Pushes other robots out of a ring.
Using a
1/18/2011 - I still haven't decided what color to paint it, hence the Pink or Black in the title, but it's almost operational. I've got the line sensors, … Read more
accepts programming. wheels and servo are controllable.
Yeah! We're very excited to be building our first "real" robot. Got the kit as a b-day present. Spent the afternoon yesterday putting it together, and getting the … Read more

n/a
Works like LIDAR - uses a wiimote
  First RADAR then LIDAR now WiiDAR ! Read more
A tutorial for calculating series resistance and reading LED data sheets
I've noticed that some people are uncertain how to calculate series resistance for a LED or when using a group of LEDs are uncertain about wiring them in series or … Read more

Microcontroller UPS

I have the following problem.
I’m rebuilding my SEA RENDERING http://letsmakerobots.com/node/21098 project from two Arduinos to one FEZ Panda running .NET
In my original setup I had one switch for the main power and one for stopping the logging. The reason for this is that if one shuts down power when the system is writing to the SD card, you might end up with a corrupt log file or in the worst case a completely ruined SD card. In an attempt to remedy this I made the following circuit that worked great on the breadboard.

Move around RC, obstacle detection......
Using a
  This Robot uses the Motoruino By Guibot http://lab.guilhermemartins.net/2010/03/09/motoruino/ The Motoruino is a very handy board for creating projects such as … Read more
  Here I will try to help begginers with the most attractive electronic device the LED. :D First of all the definition of a LED: An LED or Light Emitting Diode, … Read more
Navigate around via ultrasound and two pushbuttons
Using a
*///This Robot is a work in Progress\\\\*  I will upload a video of it once I complete the robot. Read more

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:

Provides instant life to a robot that you are building
Nick from Gadget Gangster is one guy in the suppliers business who has truly understood that if you support the community, the community supports your business. I … Read more
Detect unusual event and notify the operater to remote this tank to scout the surrounding via internet.
This is my tracked bot combine Lynxmotion track system with Phidgets SBC. I like phidgets because it supports multi language and I finally familier with one of them … Read more

Mounting brackets for SRF05 (Open letter to Jack / DAGU)

SRF05 is still IMHO the best low-cost distance sensor.

And there is still no good / smart / fancy / easy / pro / cheap way to mount the darn thing on a turning neck / servo / front..

We now have a good contact to DAGU from China who makes cheap and cool robot-stuff.

So.. I thought.. Why don't we make some suggestions to how we would like such a mounting thing(ey) shaped and made? And then ask Jack from DAGU if he could start producing it?

This was my idea.. and now I need your help and ideas towards the design :)