Let's Make Robots!


How many times , i can upload sketch to a arduino device.? what is differnce between UNO & NANO

How many times , i can upload sketch to a arduino device.? what is differnce between UNO & NANO

I added the Arduino Sketch to the attachements, feel free to download and use it. Please let me know if you have some suggestions! Read more
Line following
Using a
So after some help from here and pololu I managed to come up with this little freak :D It gets his kP and kD values from BT from phone so I don't have to reprogram … Read more

Doodle bot not connecting

I recently purchased the DAGU kit for the Doodle bot. I set it all up as per the instructions and uploaded the sample text. I am a beginner and was hoping to use this simple kit to learn the basics of how all the components work and are programmed. Originally I was unable to get the robot to work properly, the right motor would spin continuously and the left was not responding (I checked, both motors were fine though).


However, now I am unable to upload the sketch to the controller. I get the following error:



Learns by listening and the web. Talks, answers questions from her own memory or Wolfram, tells jokes, expresses opinions, quotes wiki or people, tracks heat or colors. Has reflex behaviors. Uses various web services. Has her own motivations that drive autonomy.
Using a
1/8/16 Update - The following is new since the last time I posted:  I finally made some new videos that can be found on my youtube channel...  Read more
This tutorial shows you How to get the RSSI of an Xbee using Arduino!
It took so much time to get this working. But know everything works fine. Using RSSI you can make many funny projects, like object detection and so on. Check out … Read more
Once a CD Drive, now a scanner
I created this scanner after working with it, either directly or indirectly (I mean I had to learn how to use Stepper motors, program in the Processing software, … Read more
Robot for some airsoft senario like demining
Using a
Hello, After 3 years of trying into control amp eater motor cc ccw i have finaly reach my goal (after some fails) Here my project for an remote operated robot that … Read more
I’m often thinking if it is possible to make Art with Arduino. Arduino is a machine, a little computer made with electronic circuits. It hasn’t a soul. Can an … Read more
Hi there,  TechWeekEurope are running a competition which I helped create and I would like to invite the "Let's Make Robots" community to take part.  It's office … Read more

Interfacing from PC to Arduino via PWM radio

Greetings fellow LMRians,

I am in the planning stage of building a quadcopter, which will be my first ever flying robot. So excited!!!! I have a question for you all: how would I interface some sort of PC control to the machine?

You can glow LED in 512000 colours using keyboard keys
I created this software using Processing software. If the selector is set in red, then the software sends values from 0 to 79, depending upon how much brightness is … Read more
Navigate around
Using a
I made this robot at the begining last year, but never had the chance to share it. Someone asked about this robot, so I thought it might be nice to share it … Read more
After struggling for days with multiple designs, I have come up with something showable (I doubt this word exists). I have not included automatic movement here. I … Read more

question about arduino and supply current

hi guys, I just bought a ucam ttl jpeg camera for my arduino and have some very basic questions.

Reading the dataset it says that to power the camera it require 3.0V to 3.6V DC range nominal 3.3V. So I plug it into the 3.3V pin from my arduino mega, setted it up and it worked.

However, im a little confused about the specifications from the datasheet.Namely it says that

Supply Current (ICC) VCC =   3.3V    58(min) 62(typical) 76(max)   mA

But the current draw from the 3.3v pin, according to the website is only 50mA.

programming mr tidy robot

I have mr tidy all put together running the sample code it will pick up color cups sometimes but when it does pick up then it stops in mid air and shuts off i really need help with tweaking and programming this to work i know im not exactly being specific but if anyone out there has a mr tidy working or know alot about programming mr tidy please help looking for any help thanks.

Howto build a MaKeyMaKey Shield for Arduino
MaKey Makey is a project created by Eric Rosenbaum und Jay Silver. It's an Arduino based keyboard. A very special keyboard, because you can use apples, bananas or … Read more
Hopefully moves around and scares the cats.....
Using a
My fourth robot and my first quadruped, influenced by Chopsticks Junior and Jeffrey The Quadruped. Built using: Read more

motorcontroller board [FIXED]


I am trying to build a segway, I know how I am going to make it, but I have been struggling to get the motorcontroller to work for days now.

I attached an accelerometer and a motorcontroller to an arduino uno. When I tilt the accelerometer 2 indicatorlights on the motorcontroller change, so this signal must be right. But when I measure the voltage at the motor output I get only 10-60 mV.

I tried using more and using less Volt (5-15 V) on the m.c. board itself. (I attached it to an old model train transformator)

Please Help


Can the Arduino UNO board be used in a kit?

If I were to make robot kits that would be sold online, can I use the Arduino UNO board as the robot's brain? Can the board be resold in a kit? Thanks!

Tells the direction of motion
The device uses 2 ldrs. It is programmed to check if any of them is low(I mean not receiving light). If so, then it checks if now the other one is low. Based on … Read more
Sweeps the floor using ultrasound, IR, and an encoder for obstacle detection/avoidance
Using a
this is a follow-on to an earlier proof-of-concept robot found here: http://letsmakerobots.com/node/36052 The brush part of this sweeper is from a Shark hand held … Read more

Hexapod controlled by arduino+devantechSD21

Hello there,

I am working on a hexapod robot and i am trynig to controll it by using aruino + SD21 servo controller.When i am  test each servo separately ,are acting like i want but when i am connecting all of them its like most servos are not moving at all.


This is my code:

#include <Wire.h>

#define ADDRESS 0xC2  


int servo1  = 63;

int servo2  = 64;

int servo3  = 65;

int servo4  = 66;

int servo5  = 67;

int servo6  = 68;

int servo7  = 69;


Finaly, after years of waiting, the killer app is here: ArduinoDroid an app that allows one to program an Arduino board from a tablet or (some) phone. Yeah, now you can pack light for that robotic contest or conference, no need to carry the whole laptop, just a tiny 7" tablet that you can also use to read, watch movies, play games... or quickly tweak your sumo robot's code.

pushes other bots out of the arena
Using a
Hi everybody, as some people allready know i am new to LMR and robots all together, meaning this is my first robot. It was originally going to be a holiday project … Read more
Autosquared, or automatic automobile, or just A2 is my current testbed for developing GPS code, ultrasonic sensor relilibility, etc in an outdoor enviroment while … Read more