Let's Make Robots!

Slightly more advanced LDR eye

Read this history first, if you have an hour to kill.

The challenge: make your bot rove around your house. Use no active beacons. Use observations by your bot only. Now, does your bot know where it is?

One possible answer: an eye and a brain.

Room Recognition

Each room in the house has a unique lighting situation. A simple eye that looks around in eight directions would "see" a pattern of light and dark segments. Each cell is connected to one ADC on your uC.

It is about time! (SpeakJet visited)

Hey, I can hear it now! You've been here for HOW LONG and you haven't POSTED A BLOG????

Hey, I'm I just not a very "daily blog" kind of person. It takes me FOREVER just to design and build something. Course then it is often "over-engineered" - so of course it takes me a long time, and I just don't take the time to blog. :-(

Anyway, the time has come that I at least try a little bit to break this bad habit...

For awhile, I'll need to catch everyone up with what I've been doing - maybe I can do that over the next few weeks (or months). :-()

Build a brassier fly trap

I'm working on a steampunk inspired brass animatronic venus fly trap. I will call her Venux. Venux's robot page is posted, but there is more info in this blog.

Driving a CNC machine directly from an STL file with a DAGU Spider controller

I want to drive a CNC milling machine using only an Arduino processor and an STL file. The STL format was chosen because it is very simple for me to understand and almost all 3D CAD software can export an STL file.

In my forum post here: http://letsmakerobots.com/node/34958 the feedback I go was basically.

China 2010

21-5-2010

A few things have happened this last month. I meet Xiao Yue (Little Moon) about a month before I went to Australia. She can't speak much English and my Chinese is still very bad but she seems to like me anyway.

This was taken on her birthday. There was a bit of a food fight with the cake so we ended up with cream on our faces.

Why I Respect my Robot Elders

I've been forced to take holiday from work, Bek has closed my lab until June 1st, and I don't do down-time well.  Given I'm without a lab for the moment, I'm forced to seek other outlets for my brain.  So, I thought I'd write a few reflections regarding my experiences at LMR in the last two years I've been a member.

I thought I'd write about something I've noticed about LMR in regards to the influx of knowledge: Respect for our Robot Elders.

What's a Robot Elder?

GRemote

This is my first attempt to make a custom remote controller, and also my first customized Arduino.
After seeing this post made by ObbBot I wanted to try to make one myself.

I figured that if I purchase one remote controller it would be cheaper than buying two of these and paying shipment to Portugal.

So, ripping the guts from a game remote controller I get two joysticks, a couple of buttons, two nice motors and one small lcd.

RepRap Stepper Driver v1.2 and Next Gen CNC

In the picture from top-left, clockwise to bottom-left: the terminal block (24V power up to 13A), the 2 X-axis drivers, the Y-axis driver (blue heat sink), and the Z-axis driver (blue heat sink), the Arduino controller (direction x3/enable x3/step x3), and just below the terminal block there is a small 9V regulator board to shift 24V down to 9V for the Arduino.  Everything is mounted on an MDF board, and the board is mounted with baling wire.

 

How-to for Thomas

First, lets state our goal:
We want a robot to drive to dark areas while avoiding stuff on the way using various sensors.

As with everything, we break it down into smaller pieces. We test each one individually, record any numbers we get (ADC readings and the like) and then start putting them together. While doing each of these tests individually, it helps us figure out how we are eventually going to put them together.

If someone told me to accomplish the goal above, I would do it just like this:

IR phototansistors, sensitivity and RC time constant

Some time ago I had a great idea: I'm going to make two robots. One will be an obstacle avoider and its job will be just wander around with its big head. The other bot will then try to catch it and hit the head with a hammer. Tracking would be done with infrared leds and phototransistors. For the time being I've pretty much completed the first part and posted Head. Head already has infrared leds on its head so next thing would be building an infrared tracker.

A journey into small robotics

Swarmi - A journey into swarm robotics

$20 Robot platform

The Making of a Robot including Mcu for less than $20

This project was devised to show how easily it is to make a robot on limited funds.
It is a good "Starting Off" Robotic base as it can be easily changed and transformed.
This is just the start of the project and there are many additions planned for it.

Simple motor control for Mr. Basic

I have seen a few people asking questions about controlling Mr. basics motors. One problem is that they draw more current than an L293D can handle. A L298N will do the job but you will want at leat 6V. Below is a schematic of the simplest way I know of to control your motors. Using a 5V relay you can run from 3.6V to 6V. I suggest a 9V relay if you want to use 7.2V.

V4 Stepper Driver

Hi LMR!

It's been a loooong time into WIP but it is finally there:

v4_drv

 

 

 

 

 

 

 

 

 

 

(Yeah scaling is bad, see the link down below for the Eagle files)

So what is in the picture above? I'll answer that for ya ...