Let's Make Robots!

Issues with my nozzle (Whey!)

I am having a bit of trouble with my 3D printer at the moment, and thought I could gain some wisdom from our 3D printing geniuses (plural?) here on LMR.

My extruder keeps blocking, I am using PLA, printing at 190 degree's, with a hotbed of 57 degrees

The printer is a makerbot replicator 2 clone, called the duplicator.

Flame Photodiode is more like a regular photodiode

I bought a small flame photodiode for a robot Im currently working on. Being a "flame" photodiode I thought it would ignore most light and pretty much only output whenever it gets light from a flame but it seems normal day light can set it off. Even lamps or sealing lights seem to be enough for it. 

Pretty much almost makes it a reguarl photodiode. 

I can get the data from it with this line of code: FlameValue=analogRead(0);

Just read the analog pin.


Anyway I can maybe fine tune it better for flames? 

Can I connect a motor shield on the DFRobot Bluno?

Can I connect a motor shield on the DFRobot Bluno Uno?

I'm planning to use the Arduino Uno compatible Bluno with motor shield, can anyone confirm if this can be done?

[Tip] Make a Simple robot low cost

HI, My name is Mirko i'm 19 years old and i'm a student. For the last year in this school i want to build a simple robot that i can program using some programming language like c, c++, etc..i'm not very rich and i can't spent more then 50$ so i'm asking you if you can suggest me some guide or project to make a robot low cost and not much expansive. i'm searching a project like in the 'Start Here' section. Maybe with IR sensor and the wheels

getting started with nRF24L01

Hello guys I'm trying to send message from arduino due to arduino duemilanove atmega328 using nRF24L01 

arduino due is the transmitter and the code is


Trying to find the largest data value in an array

My robot needs to do a sweeping scan. Im trying to get it to sweep from 0 to 180 and collect data values from each angle. I have that part down. Im trying to read the array and find the largest value.

This turned out to be harder than I thought. So I made a new Arduino program seperate of the robot's code to make things simpler. This code does a scan from 0 to 180 and prints all the data values (Flame Photodiode), then it waits a second and prints the highest value in the array. 

Cheap MICRO USB Control 5V 2-Channel Relay Module $4.56 with Free Shipping

MICRO USB Control 5V 2-Channel Relay Module $4.56

It's equiped with the USB and Serial port which can connect to the PC and other devices conveniently.
The normal working voltage of this module is 5V and it has the 5V power port.

spreadsheet control

How do i get ioio input signals into excel(any spreadsheet) in realtime and control the outputs with excel?

Support me on my trip to Space

I am currently competing for the Hackaday Prize 2015. The grand prize is a trip to space, a dream (yes, just a dream) since my childhood. You can support me by following me and giving my project 'skulls'.

Thank you, LMR!

please i need help with programing something (will pay you)

hi there, i need help with one of my projects, i want to make a usb that i can plug in to my computer and will auto-copy all the files from 1 folder, i want it to be as easy as possible, prefferably i want to assin it a folder and then when i plug it in i want it to copy all the new files from that folder, i want this usb to work with windows 8 (the operating system i use), it would help me a lot if someone could tell me where to find a progam that could help me do this, or if you know programming and really want to help you could try to write a code for me (only if you want to of cour

Is this diagram correct?

It's only been a day since I started planning to build a robot. I'm planning to follow this wiring diagram which I've produced from another pic. I have limited knowledge regarding robotics, so I want to make sure if this schematic is correct.

I'm having a problem on the power input. Is it correct to have common ground on both boards?

need help with R-Pi and ad-hoc wifi

Hello everyone,

I tried the whole day to get my R-Pi B+ to host an ad-hoc network. I tried multiple tutorials and wasn't able to get it working. I always reached a point where I was able to see the SSID of the network on my arch linux laptop with networkmanager, but It didn't manage to connect. And on my windows 8 PC the network didn't show up at all :( So if you've done this before or know a tutorial that should work let me know.

I want to do this so I can ssh connect to my R-Pi based robot from about any device that can do ssh without needing a router.

Can't trigger this relay with signal from my picaxe

I have been trying to get this relay to trigger from a "high" signal from the picaxe 28x1 I am using. As you can clearly see, I am missing some of the technical knowledge to debug this simple issue.

This darn relay

I have tested that the high signal is sent properly with a LED. It works. I also tested that the relay works when I pass current directly into it from my battery. 

All LMR are sold to you!

as abidance servants ! inslave the world. frist in impressions "its great. " All LMR are sold to you! "could be me but it just doesnt sit right for a slogan  "LMR sold to you!"today. or something.

                                                      Jinx 3Dprint bin.

making own USB motor controller with 754410

Hi All,

I've got two 754410 motor driver IC's on the way, and i want to stack them one on top the other (as explained on the robotroom website) to increase their total per channel amps.

Is there an easy way to create a usb interface for this IC?  I've got spare USB cables, Atmel chips, and odds and ends that may do the trick, but i just don't know exactly how to combine them into what i need.  I'd like to make  a homemade version of the pololu usb dual motor controllers to be precise.  Any guidance will be appreciated!


Hacking Motors?

Dear: LMR

You should know that recently my Poppet came in the mail after my dad backed Jayden Edwards off kickstarter. So anyways I decided to turn my Poppet into a self navigating Poppet. Because of that I need to replace the servos off of the Poppet. The Poppet servos aren't accurate enough to measure degrees so I need knew ones.

Searching for a cheap 5 V approx. 15.000mah rechargeable battery

Hello all,

For my current project I need to control 13 digital servos.I am using an Arduino UNO R3 clone (Sainsmart) and an Adafruit 16 channel servo driver board (not the shield).

Connecting two arduinos wirelessly

I've one arduino due and a uno. I want to connect them wirelessly i;m thinking of using bluetooth as it is cheap. I want to know is it possible using bluetooth and which bluetooth module should i use. If there is other cheaper or easier way to do the above mentioned task please let me know. thank you guys 

simple robots collaborate to lift a human body above the ground

Hey guys, 

 I am trying with friends to design a relatively small and simple robots that can collaborate together to lift a human body or move a human from one place to another. The assumption is that the human is laying on the ground and will not be moving. Assume a very simple enviornment.. I have a basic idea in mind, but I would like to hear more ideas and suggestions..