Two Little Ducks - A Road Test

clock March 29, 2013 13:39 by author kimm |

 

LBD (Little Black Duck) gear motor and wheel kit from Dagu is a tiny drive system for little robots. Used in the Doodle Bot kit it is also available in a pack of two motors + two wheels.

What’s in the box

WP_20130327_004

The two servo looking things are the LBD gear motors. These are essentially servos without a limit stop and without the control circuit. ie, they are not servo’s even though they look like it. The giveaway is there are only two wires in the lead for +ve, –ve but no PWM signal wire.

All the servo horns are included for both LDB motors. The only one needed is the circular one for fitting the wheels to the motors. I’m not sure what the others would be used for since these are motors not servos. Perhaps it is just as easy to include all of them. Also in there is a packet of screws for fixing the wheels to the servo hubs.

Two wheels are included which are nice clear laser cut disks with removable rubber treads. One is shown here with the tyre removed. It is just thin rubber but quite grippy and not plastic.

WP_20130327_007

Putting It Together

Assembly is a pretty quick job. You will need a little Phillips head screwdriver about #0 size. A pocket knife may do in a pinch. The only thing to note is to use the centre hole in the group of 3 on the round servo horn for each of the 4 screws. Things just don’t line up otherwise. The hole is shown below pointed to by the screwdriver…

WP_20130327_012

Four of the screws with the washer like head in each wheel and you get them assembled like this:

WP_20130327_013

Then its onto the LBD motors with the really little screw in the middle and your done.

WP_20130327_015

Start Me Up

To test the LBD gear motor and wheel I’ve used a Micro Magician V2 controller. These has built in motor drivers so its super easy to get things going.

Add some batteries and a little bit of code and presto!

WP_20130327_016

Test Drive #1

I put a bit of tape on one of the wheels so you can see the revs when they ramp up to full speed. The Micro Magician is running a slightly modified version of Dagu’s sample code for the motors. The motors sound a little noisy but they aren’t as bad as it appears in the video rather about the same as any servo when it moves.

Test Drive #2

This video is from Dagu showing the LBD’s powering a Doodle Bot



Back to the blog

clock March 21, 2013 17:21 by author kimm |

After a long absence the blog is back. We hope to keep you informed of new products and other robot related stuff.

Kim



Magician Chassis

clock June 19, 2011 21:26 by author kimm |

Dagu’s Magician Chassis is now in stock. This is a great little robot platform featuring two gearmotors and chassis plates with all kinds of holes and cuts that make it easy to mount sensors, servos and other components.

The space between the plates is a good spot to put some batteries and few sensors at the front. The chassis plates are acrylic plastic and are quite easy to drill and glue.

 

Magician Chassis 

 Magician Chassis - Front Magician Chassis - underneath Magician Chassis - with fruit attached



Dagu Servo Fun

clock June 7, 2011 21:12 by author kimm |

We’ve got a few new products coming in from Dagu Electronics. If you’ve spent anytime on the friendly http://letsmakerobots.com/ site you have probably come across Dagu and their products.

For starters we have a few servo motor bits and pieces…

 

8g Servo

The little 8g servo is great when you need a cheap servo or many:

dagu 8g micro servo

 

Continuous Rotation Servo with Wheel

Looking for a cheap robot drive system. Put two of these things together for full speed and direction control.

 

Continuous rotation servo with wheelServo and Wheel on a robot

 

 

Pan and Tilt Bracket With Servos

This pan/tilt kit, designed by the members of "letsmakerobots.com" has mounting holes to suit almost any range sensor and includes 2 miniature servos plus all the nuts and bolts required for assembly.

 

Dagu Mini Pan and Tilt Kit



.Net Micro Framework is here with Netduino

clock January 20, 2011 22:57 by author kimm |

 NetduinoWe are now at the start of a wave of new boards using 32 bit processors that are actually affordable for the hobbyist. This has opened the door for interesting programming languages like Microsoft’s C# to be run on resource constrained devices. 

Our first devices are the Netduino and Netduino mini. You can program these boards using Microsoft’s Visual Studio development tools. Programs are written in C# (bit like Java) and they can be debugged while running on the board in real time. Now you can know what is going on!

Under the covers is the .Net Micro Framework which executes the code, provides memory management and includes a lot of code libraries written for low level operations so you can concentrate on the fun bits.

The development process is very fast and easy to learn and best of all the tools are free (as in beer).

These boards are an excellent way to get into embedded programming on small devices. If your a more of an expert then you can use the full power of C# to build complex programs using object-oriented techniques. Either way, these things are a way to get a project done fast.