Let's Make Robots!

LMRnet AKA LMR IoT (Internet of Things) Data Service


AKA LMR IoT (Internet of Things) Data Service

Some days ago I saw in sparkfun news this particular one about their new Data Service (https://www.sparkfun.com/news/1527).
After that I asked Frits and Matt if we could host something similar on LMR's servers.

Join the *LMR 3D Print Club*

Do you have a 3D printer?


Interested in getting prints done, but have no printer?

Let's help each other printing more stuff :)

There may be a 3D printer or someone who'd like to pay for a print close to you..

sensing water flow in a pipe


I remember my dad yelling at my sister and I since we took long showers.  My sister had the hot water turned off more than once on her although I never did.

SRF04 vs. SRF05

I used the SRF05 on a previous robot I built a while back and it was pretty impressive. It was also a little expensive. I just got a deal on a box of SRF04's and got them but I can't really find the main difference between the two models.

Can someone illuminate me?

KiCad problems on windows 8


Don't know if this is the best place to ask about this sort of stuff, but here it is:

New to the site

Hi everyone I'm new to this site and would like to say hi it looks a very good site and lots of interesting stuff to do I am very new to electronics and would really like to learn about it and would like to know if any one knows of any good start up projects or information to learn the basics of electronics to progress me further on Thanks

One motor is faster than the other?

Hi makers

Im trying to make my remote controlled robot working. Im using an Arduino UNO with the official motor shield R3. The controller is at this point a simple breadboard with 4 buttons on. The wireless communication is handled by RF links. Im using the Tamiya Twin Gear motors with the following DC motors. Im using the 203:1 gear ratio. Im powering both the shield and the Arduino using two seperated 9v batterys. 

Attiny Interrupts and communication

Hi everyone!

For the past few days I have been working on a "smart" servo. Basically, I want the precision of a standard servo combined with continuous rotation and low costs. 

The plan is: Put two brightness sensors on one of the inner gears and use them as a quadrature encoder to calculate the angle. This value is then sent to an arduino or directly used to reach a set position. 

What I have done so far:

I decided to use a HK15138 Servo from Hobbyking because they are about the cheapest servos you can find at this size.

A small update on a project.

Hi guys o/

It feels like an eternity since I talked to you all :D But LMR is up and sadly I don't see the SB! Anyways, it should be up anytime soon as frits and blue and everyone are indeed working super hard on addressing the issue.

Device signature 0x000000 while burning bootloader


So I bought 7 Atmega328's and burned bootloader's into 5 of them.However for 2 of them I get the following error:

avrdude: Device signature = 0x000000
avrdude: Yikes!  Invalid device signature.
         Double check connections and try again, or use -F to override
         this check.

I'm using Arduino Duemilanove as ISP and got the com settings,board selection and programmer settings correct.