Let's Make Robots!


Faulty board?



I bought a card "Dual 15A Wild Thumper Arduino DC Motor Controller"

When I connect the battery (voltage OK) to the card the led "good battery" lights for a while and then goes off.

The "power" led is ON, the 5V output is ok, the corrent is about 40mA.

The board doesnt work.

Do I had to send the card to the seller or can I do  other controls.?

Thanks, Stefano

PS Sorry for my bad english language


[solved...sort of... works... far from perfect] How to properly control (arm+calibrate+command) an HK-20 ESC with arduino?

--- Solution ---

UPDATE: The below solution is NOT 100% reliable, sometimes I have to repeat the 90-10-20 process quite a few times up until I have a proper the ESC properly armed/calibrated. And when I say a few times I mean up to quite a few minutes with battery unplug/re-plug in-between. But now that the craft is mostly finished (I probably just need to tweak the aft side of the skirt), I'll revise my code yet again and see what I can do about it.

  It's always funny to examine techniques at the edge of one’s knowledge. And for all MCU nerds, it’s a challenge to see how much you can make the MCU do. This … Read more

Rover 5 2WD with Explorer PCB ... Which Arduino should I use?

Hi all,

Building my first robot here .

I have narrowed down my search in to these

1.Rover 5 2WD

2.Degu Explorer PCB

Not sure which Arduino board to go with , I have hopes of attaching a IR Compound Eye and a spycam later .

Can I do this with Arduino UNO? or should I go for Spider board?

Apart from that what else should I buy to get me going?

Thanks in advance

Number of Servo's Attached to an Arduino.

Just a quick question that I'm struggling to get a straight answer from the intertubes about...

I'm looking at purchasing an arduino board to control some servo's, and wondering how many each can control?

For example: Uno R3 has 14 digital i/o pins (6PWM outputs), and 6 analog inputs. What does this mean exactly?

Does quite everything an Arduino does.
Aww yeah! Yep you heard it right! it is an arduino clone. And a very cheap one. bought all the parts at an electronic components area in Malaysia called Jalan … Read more

By comparing temperatur, Arduino tells you with RF Link if your room is too cold or too warm.

I would like to share my code. With this code your Arduino tells you by RF Link  if your room is too cold or too warm. You need 2 Arduino's.

It is just a part of a bigger project. But you can modify the code and make some great stuff. If their are some questions feel free to ask. RF link is amazing.


Question about sending integers using virtualwire.

// Tested with IDE 20 and VirtualWire 1.4, only working with those.
// RF Link using VirtualWire to Transmit messages
// simplex (one-way) receiver with a 315MHz RF Link Transmitter module
// tx pin 3 on Duemilanova (arduino)

Not receiving the correct data. Using VirtualWire

I would like to use a code for sending the temperatur and humidity. One day before, I started with sending just a short message like: LMR is cool. TX= Transmitter RX=Reciever

It only worked when I used:

Arduino IDE 020 and VirtualWire 1.10 for RX

and Arduino IDE 020 and VirtualWire 1.10 for TX.


When I use Arduino IDE 1.0.3 and VirtualWire 1.4 for RX 

and Arduino IDE 1.0.3 and VirtualWire (VW) 1.4 for TX it didn't. 


Problems when sending float (temperatur) with VirtualWire Arduino

// User Gareth    http://letsmakerobots.com/user/2941
// Project Node   http://letsmakerobots.com/node/12394
// Remote Receiving Temparature and Humidity over RF Link to LCD Display
// how to use VirtualWire to receive messages and display floating point values to&nb

Kinect and an Arduino UNO

Is there any way I can get a kinect (xbox 360) sensor to act as my robots "eyes" with the arduino UNO. For example, where I move my hands, the arm follows. Thanks ;)
A small autonomous robot that wonders around. It's built out of parts I recieved for Christmas, such as a Rover 5 platform w/ driver board.    Current Goal - … Read more
Enlight What You Adore
Christmas is past and our boys got blessed with some presents under the christmas tree. One present contained a scale model of a Patrouille Suisse F-5 Tiger. This … Read more
creeps around looking for light, fire, other robots and long walks on the beach...
Using a
  A little robot that just wants to have fun!  The code is choppy but works. I used some of Bajdi's code changed it up a little and will post it(code) in a … Read more



Having got the processing/arduino serial sorted, I thought I'd have a go with charliplexing. I downloaded this library, and wrote a bit of code to try it. However, whenever I try to verify a sketch using it (including the demo sketch), I get this error;no matching function to call to 'Charlieplex::Charlieplex(byte [3], int)'. I've tried re-extracting the library, but with no success. Does anyone have any ideas?

If this library is broken, does anyone know of a better one for charlieplexing?

Arduino Motor Shield Help!!!

I just got my first Arduino motor shield. However, all the servo ports have 4 pins. The problem is that my servos only have 3 pins. Any help is greatly appreciated! By the way, my shield is an Arduino Motor shield from Seeed.

users controlled through Tera Term - Using Bluetooth
Using a
Atom 1.0: http://letsmakerobots.com/node/31322 My previous Arduino project had a controller that was connected to Atom and powered by my laptop.  Parts:  Read more
Hi LMRtians, this is my actual christmas project. A star build out of Plexi and an Adafruit RGB LED strip. Controlled by an Arduino controller. It will be used as … Read more

Bluetooth on Smartphones PLUS and Xbee receiver on Robot


I have a another Question for all of you guys :D


Q: CAN I Control via Blutooth on SmartPhones using Xbee Reciever on Arduino Robot...,? 

OR it is POSSIBLE to Control the Xbee on Robot via Bluetooth on SmartPHONES...,?

If It can be,..., HOW ? and please Help me by Teaching me about it :D


Please Answer Prayer :D 

Need help with Arduino UNO R3 + HC-06 Bluetooth

Hello all! After I posted my Atom tanky robot that I was working on, I am now trying to connect it with bluetooth. I also bought some Ultrasonic sensors (HC-SR04). 

The bluetooth I use is: HC-06 Bluetooth V2.0 RF Wireless Transceiver Module Interface RS232 TTL

Navigate around, controlled by wireless tilt/accelerometer enabled controller
Using a
I've been building things like this for a while, and actually, LMR was one of the first places that introduced me to hobby robotics. I had already been building … Read more
Pumps Away Condensed Water
Me and my wife just bought an old house. Inside the house is an old oil heating system that after this winter gets exchanged to a newer system. Currently this … Read more

Serial monitoring


Does anybody know of a decent freebie transparent serial monitor? I've been having some trouble with processing and arduino, (see this), and I'd like to be able to compare what processing and the arduino terminal are sending so I can find the problem.

Thans in advance.

Talk to my computer through Serial?

Long time no see LMR!!!!

This semester was my most brutal yet, but the rewards have been priceless!


Anyways, back to the robots,

So my current project is to create a virtual indentity that I can have a VERY simple conversation with. His name is Sergei, cause everyone needs an awesome Russian buddy. But I find myself being a bit stuck on one thing: Serial Communications


What Im really trying to better understand is how to make the Arduino respond to my serial input. 

Uses a smartphone to operate. It can be an assistant, pet, or a telepresence device. Can be anything depends on the mobile app you write.
Using a
Hey Guys, I know, I didn't post for a while. Didn't have time to post some of the projects, sorry about it. Alright, so here is our new project, we plan to go … Read more
This Legos robotic project uses JAVA sockets to communicate to an onboard Arduino which controls servomotors, LED's, and drive motors. It features a wireless IP … Read more