Let's Make Robots!


add.pngSubmit Something else Did you make something else? Show us


Arduino motor schield

I bought a new l293d motor shield when I connect it uno board the led of both board are turn off and the pc can't find com3 port.

Is it damaged one?


Can I put an infared range finding syestem and an servo on an rc car and reprogram the microcontroller,so it turns into an  obstacle avoider,sorry for all the stupid things I have been posting (resistor array)



May the 1/4th inch... Sale on custom waterjet CNC parts from Big Blue Saw

Next week, May 4-6, Big Blue Saw will be offering a discount on all 1/4" thick aluminum 6061 and hot roll steel 1045 parts ordered online. These are made using our state of the art CNC waterjet cutting machine. Every order placed will automatically receive a quantity discount.

I'll post more details, when the sale starts. In the meantime, you can get your parts ready by uploading the designs to our online quoting system:




Machines that make mistakes

Hello ! We are Design students, and are very new at all of this, and we would like to make an object that works with any sort of energy, that should be 'alive'. Our idea is to find a way to make it do mistakes, as humans make mistakes. Does any of you have any suggestions ? Our focus is on simple mistakes or children's mistakes, such as clumsiness, or spilling things, or falling, fearless actions etc. If you have any crazy ideas and tips, it would really really help us ! Thank you so much in advance

Recommendations for power source

Hi all,

It's my first post here so I'm hoping I'm doing this right. I'm currently building a robot on the oh-so-popular Dagu Rover 5 platform (4WD). I don't have much mounted right now. One Arduino Uno, with an OSEPP motor shield and a servo on which I mounted a PING))) sensor.  

For the moment, I'd just like to get this guy running autonomously to get the experience of an end-to-end project. I'm probably not even going to bother with the encoders just yet. 

2.4 LCD Touch Screen

Hi guys,

I just got a touch screen and I am wondering how to use it

 I have no clue where to begin.

I have an arduino uno r3 and the touch creen. I will include a picture.

I have looked through the examples, but I am still confused.

I would just like to use it for the paint program to start. TO just get it running.

I downloading the libaries but was confused by that as well. The one on lady ada says to open cpp file and change something. Thats where I got confused.


RC car controller

Hi, for a project for school I'm making an RC car,

for the controller I use 2 PS1 joysticks, 1 for the movement and 1 for the camera.

the camera movement is easy but I can't figure out to get the info of 1 joystick to controll the 2 motors.

I'm using flowcode 5.

Can someone help me with this?

Arduino ethernet sheild and arduino due

Hello guys, I've a wiznet w5100 ethernet sheild (http://i.ebayimg.com/00/s/NjAwWDYwMA==/z/XyMAAOSwqu9VHBTB/$_12.JPG) and arduino due, but i don't know how to connect them, can you guys help me with the connections

Ping sensor question

Hey guys, I have a quick question.

My robot Ive built is runninh great with the exception

that it tends to run into walls.

My code states > 40 then do such and such.

Should I increase or decrease. It will drive

into wall. stop then scan then turn around 

and in most case drive into the next wall.

im looking for a sketch to run 2 dc motors

hey guys im at my ends rope.

im.going to start fresh hopefully you can offer a

sketch that i can use to 

make sure my l239d is working

and my power sources are correct

thank you. 

James robot driving me crazy

hey guys i am seriously losing my mind. I am very eager to leanr and improve. I seen this project and i really wanted to build it. Its been like two months and i still am.having issues.

Interfacing arduino with SIM900A GSM module

Hello guys, I'm new to GSM modules. I've a very little idea of there working. I bought my gsm module from here: http://www.ebay.in/itm/GSM-GPRS-SIM-900A-modem-with-Stub-Antenna-for-PIC-Atmel-Arduino-Raspberry-Pi-/291389483047?_trksid=p2054897.l5673

I'm trying to send sms from the module but it is not working. I found the following  code online but it is not working


first robot

hi guys i posted about the james robot which i am not having any luck with. I am wondering if you could suggest a robot i could build that has easy instructions so i can at least build somethibg and heal my ego. i only have one micro servo a ping sensor and two dc motors. and arduino uno


battery case question

hey guys i salvaged this outta a toy wondering if i connected it wrong.

can you take alook at the pics and offer some insight. thanks

Cannot get the motors to work for this robot

hey guys. I am not getting any movement or anything from the two dc motors. I am using a l239d driver 

here is the code and also a attachment of the wiring.Thanks I hope someone can help me

#include <Servo.h>

#include <NewPing.h>


//Below are the symbolic constants. Instead of having to type in a non-sensical pin number each time we want to do something we can write an easy to understand name which represents the pin, the compiler will then replace the names with the numbers

#define LeftMotorForward 8

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..


I've been setting up my profile for selling on the marketplace and am wondering if there are any seller settings or tables to use for adding shipping classes. 

For now I've included shipping costs into the price. 




FrankNeon on LMR.

Can ED-209 be made to do PID balancing, like a MIP robot?

Hi All,

I'm having some trouble mentally figuring out how ED-209 could be combined with a two-wheeled PID balancing robot.  In a two-wheeled balancing bot, the gyroscope is ideally placed close to the axis of the two motors.  If ED-209 were to have "PID feet", would the gyroscopes go in his feet?  or would one gyroscope go in his torso to keep it balanced while his feet walked here and there?

First Arduino Obstacle Avoiding Robot

I am working on putting together my first Arduino robot. This is the set up I have come up with based on the parts I have on hand. Do note that the IR sensor is really a Parallax Ping sensor, but I couldn't find one of those in Fritzing. Does anyone see anything that stands out as a problem? I know that I should really be using a motor driver, but I don't have one yet, so I am hoping that this jury rigging will get me by till I can order one. Comments and suggestions are welcome!!

Speech Recognition

Hello everyone, I am a beginner and new to letsmakerobots.com. I love the site. I have a project in school that involves designing a speech recognition system,and am in dire need of help. Suggestions and resources would be a life-saver. feel free to drop a message,or better still,email me at: anijapan5@gmail.com. Thank you all.