Let's Make Robots!

How to build a delta 3d printer?

Dear: LMR

Hello LMR it is me Noah again. You should know for the past few weeks I have been trying to make a 3d printer. I have given up on my original designs. You see I had an idea for a 3d printer that was too diffucult for me to build which was a soft robot arm 3d printer but it was a failure. Now I have decided to build a delta 3d printer and this is what I am trying to ask you.

Google releases Android robot libraries

While Apple says it is against App Store rules to try to use an iPhone as a robot controller, Google has released Android robot libraries.

Thinking of XBee Communication, a few questions before I jump in

What I intend to do is create a wireless link between my robot and my laptop, for remote serial programming, and remote control.

I posess a PICAXE 28X1 project board that i wish to connect with an XBee module.

From what I've seen in http://www.rev-ed.co.uk/docs/axe210.pdf an AXE210 is suggested. On page 9 however, we find that the XBee is only connected to the AXE by three pins: two inputs and one output.

Schottky diode bridge IC for L298N?

Hi all!

Noob question: I'm using the L298N dual full H-bridge to drive my robot's 4 motors, can someone please give me the name of a chip that contains schottky diodes in a bridge configuration, so I can use it on the outputs to block back EMF? Sparkfun does the same on their boards: http://www.sparkfun.com/datasheets/Robotics/ROB-09571-Serial%20Controlled%20Dual%20Motor%20Driver%20-%20v11.pdf

I know that there are such ICs since I recall a friend using a 16-pin DIP in a similar occasion, but I can't remember it's name. I think it started with "L".

How would you spend $100?

Hi LMR,

I've been closely following this site for a few months now and am itching to start building robots and just nifty things with electronics. I've bought an Arduino Inventors kit from sparkfun, and I can say I'm fairly comfortable now with the basics but I have a very limited supply of parts. With university finals coming up I've decided to buy roughly $100 of parts as a little reward for myself at the end of exams. 

Reuseum, store.reuseum.com

Hi there all,

I'm building an online store for the surplus technology company, the Reuseum, and would greatly appreciate feedback regarding making it better and stocking useful things. We have lots of components and such, odd bits of tech and other randoms. Your help is greatly appreciated and if you do decide that you would like to buy something from store.reuseum.com, let me know you are from LMR and I'll stash some cool extra goodies for ya.

Regards,

David

Did you donate already? UPDATED

UPDATE MADE MANUALLY BY WEBMASTER, BRUTEFORCING THE OLD POST :)

Hi all, sorry for the site not having a clear communication. This is what happens when everyone helps, and time passes - we get old links no longer working, and misleading information..

It's impossible to keep updating who runs what to everyone all the time - many people are helping, new mails are written every day, things change..

[ALMOST SOLVED] HC-SR04 still giving me grief...

June, 7th 2012

----------------------

- Updated schema.

- Segregated power supplies of arduino + sensor
- Added 0.047uf caps to the motor leads (one per lead) grounded by the casing.

- Motor + servo power supply changed to 4 AA rechargable batteries.

- Arduino + sensor when powered by USB everything seems to work fine, except the sensor is a bit slow to respond but that surely it's the code's fault.

 

- Pending issues:  

Charging batteries

Hi I would like to make something which can be charged Without taking the batteries out of the robot. I am thinking of using nimh batteries as I have heard that lipos are crazy and hard to do.

MARS ROVER Autonomous Desert Roving Robot (Help Needed)

Autonomous Navigation Requirements

Guy's I'm completely new to this and just ordered my first prototype kit with the following components as a starting point.

1. Arduino UNO Rev3

2. Dagu Rover 5 4wd

3. Parallax PING

4. Motor shield kit

Atmega + camera.

I have thought about atmega + camera idea too, but for use on atmega not sending. I looked at CMUcam but it wasn't so low-cost as it was advertised (100$ it too much). I found http://www.robotshop.us/sfe-cmos-camera-640-480.html . It seems cheap, microcontroller friendly and so on. Only problems are - SMD connections, killer programming and impossible debuging.

 

So, all thoughts and good links are welcome.

Voice Recognition for 60 bucks...

So I saw this guy over at Spark Fun...

Tank tracks. Sources? Theory?

Hello all.

 

I am looking at tank tracks at the moment, and I want to ask two types of questions.

Firstly - theory

I am looking for a rescource which explains stuff like the theory behind tank tracks. What does good and bad design like? For model robots, does it make sense to use bogie systems etc. I'm guessing there is a lot of stuff on the net, but no idea what to put into google to get the results back that I am looking for. 

Can anyone throw up any useful links?

Second - Sources.