Let's Make Robots!

Graph Plotting anyone know of any java type plotting programmes

Anyone know of a simple no messing graph plotting program - ie java based (not excel )

All i need to do is plot  a series of numbers x,y    like so.......

This is the data i get from my latestThunderBird 6 project and i need to see the data presented in a simple way.

 

ultrasonic sensors > differential steering

Hi there,

 

I'm a total no nothing about robotics person.

I'm trying to connect the differential steering system of an old electric wheelchair to between 4 and 6 ultrasonic sensors.

 can anyone help me, is a there a kit i could obtain? maybe something i could adapt?

 

thanks everyone!

 

Matt

 

 

 

n/a

Battery charger (method) for lead acid battery

Hi all,

Got my hands on 4 of these babies battery

They were for free so i have to use them:-) Would like to have 12V and as much power as possible so I was thinking of this setup:

batterycharger.jpg

QUESTION 1: can I just charge this whole thing with a suitable chargers as if it is one big 12V 20Ah battery or do I have to do something differently?

Has anyone tried the X2 chips yet?

I just ordered a couple 28X2 chips for my porch gardening project, and the changes they listed in the info was sort of confusing.

I'm just wondering if any of you guys out there have tried them yet, and have any comments/gripes/tips/tricks about the newer chips.

I really wanted to try out the 28X2 module they made to compete with the Basic stamp, but I'm poor.

-Z

Large res LMR banners and pictures?

Hey LMR'ers have you found any high res/large LMR banners, pictures, logos? Im looking for some big ones so I dont have to resize the tiny ones.

Thanks

DC motor question

I was walking through Lowes the other day, and found this great trash can that looked like a robot to me. I was able to pick it up for super cheap!! What I want to do is add two DC motors to the bottom and a caster wheel. I want to make this robot carry my books around school for me. I am lugging more text book weight than I ever did in the Army with my ruck sac. My physics book alone is killer.

Trash Can

High-End Radio Gear

My remote control car met the end of its life last week. (smashed into a wall...) So, i salvaged everything i could, and found some interesting stuff:

A Motor Controller

Transmitter/Reciever (can control 2 servos)

5 batteries, ranging from 1500 to 2000 mAh

I also had lying around:

2 radio transmitters

a second switch for the motor controller

 

I need:

-arduino proto shield

-lots and lots and lots of polymorph. like a shoebox full. a shoebox from someone with canoes for feet.

Windscreen wiper motor

Hi All,

Got my hands on 4 new windscreen wiper motors for 40 euro in total. Which should get me started with building something nice. The seller told me it is one for a VW Golf which I checked on other sites and they look the same.

Of course I opened it up and it has a couple of metal connections (see picture 'inside') on the gear wheel which connect to wires going to the outside (to make the wipers go left and right I presume. That would make a nice rudimentary odometer don't you think?

My PROBLEM (if it is...) NO SPECS

H-Bridge NPN vs. PNP

I usually make a H-bridge with 2 NPN and 2 PNP transistors but I recently noticed that there´s allot of schematics on the net showing it with 4 NPN transistors and I started wondering what´s the right/best way to do it??

 

H-bro.jpg

I was wondering...

Can you controll an electromagnet with a PICAXE?

if so how?

Many thanx in advance :)

Totally Lost. Totally, totally lost.

What I need is a wheeled, remote controled machine that can go into crawlspaces as little as 4" high and as tight as 4" wide, grab a line securely, and allow me to drag the line out. Estimate that the maximum the wieght should ever be is about 5lbs, with forward and aft cameras and lights (assume the microscopic "spy" type cameras and only a few inches of veiwing area for the light).

Arduino questions

Hello,

i'm from germany and i'm trying to build my first Robot with the arduino Platform.

I've desided to build my own shild for the arduino.

It should be able to drive two motors and to connect 4 -5 servos to the arduino.

The first problems with the L293D Motordriver are solved and I've done that it works and avoids objects.

Today my servos arrived and i tested my shield with the servos.

and then the first problem:

n/a

DAGU parts price list for LMR members only

I have now removed the pricelist as we now have distributors in Europe and America.

European customers can buy from: Arexx Engineering or Conrad.

American customers can now buy from Robot Shop.

Fun books for Backyard Shenanigans

Not really robot related, but sometimes I get so frustrated with work I need to blow off some steam. Enter Backyard Ballistics, a great book that teaches you how to make spudguns, mini-catapults, and smallest of all, matchstick rockets.

This, and a few more books are written by William Gurstell, the man who had a website called backyard-ballistics.com, that sparked my brain into more research into amateury-ness.

Hello! I was wondering if anybody could help me determine compatibility issues :(

Dear Robot enthusiasts,

Hello all!  This is my first question on here so please feel free to critique my writing style.