Let's Make Robots!

Dagu 4 channel motor controller Specs

Hi All,

I was just wondering what the maximum input current would be for the dagu 4 channel motor controller.

I have built this circuit http://letsmakerobots.com/node/3880 to power my robot (the third one down).

I didnt have a multimeter at the time i finished it so thinking optimistically i plugged it in and switched it on only to get smoke coming from the motor controller board.

UDoo (arduino 2) and dagu motor unit controller 4 channel


Hi all,

I received a udoo board (www.udoo.org) as christmas gift. The board is fully compatible with an arduino 2 with the same microprocessor. Because of its compatibility there is the limit of 3,3 volt. In my project I would like to buy the rover5 as platform, but the logical doesn't seems compatible due to the logic signal of 5 volts of the motor unit.


1) Is my undestanding correct?

volume data for my project

I am working on C.A.R.L., but I need to come up with a way to turn the volume from an audio jack into analog data.

Could I just connect the ground line to the arduino ground and the signal wire to an analog input?



rover 5 gearings lubricant : Which one to use ?


I bought a Dagu Rover 5 (4 Motors 4 encoders). I notice that gearings make some noise. There is a little part of lubricant delivered with the rover but it is cheap. What kind of product can I use to do that ? (in other words, What type of lubricant to use for the gearings?)

Thanks a lot by advance


Two Dumb Questions; TX/RX LEDs on TTL and Wheel on Motor

Good evening everyone,

Two dumb questions:


I'm working on getting simple RX/TX traffic indicator lights on a 3.3v TTL system.


The LED is a tri-color RGB LED (datasheet).  I'm trying to accomplish something like in this post here, the Olin answer.

Bluetooth Low Energy

Hello LMR,

     I am currently trying to develop a PIR sensor with bluetooth 4.0 wireless transmission. I am ordering the HM-11 and HM-10 and a PIR sensor to do this. Can someone tell me what other components I require to do this?

Uploading sketches to a Mega 2560 via a Yun ?

Hello all,


I just received a Arduino Yun and like very much the easy way of wireless uploading of sketches.

How should i go about to upload sketches to a Mega 2560 with the as interface Yun via WIFI  ?



Thanks for any help.



design to print

I didn't do to much printing with my printrbot simple, just enough for setting everything, and now its almost perfect.


I designed an object with sketchup, convert to STL and load into Repetier, look great after sliced.  After the printing is done my dimension are a little bit wrong.

are there "hobby robot" servos that can move as fast as large motors / servos?

Hi all,

I came across this video (see below) of the Staubli TP80 and...how is it moving so fast?!!!

learning code ... the ups and downs

Thought id post this example to show what im going through in the learning and understanding prossess of coding. For the most part it is very frustrating ... i would have very limited understandig at the moment and practically new to coding have tried before but stopped as other things came up.

But have started again and finding it hard going ... but am having some success ..

Number one reason is not being able to find any site with a teaching process .... have found some great sites that show very good tutorials eg tronixstuff ... 

Programming issues

new to the programming world but have been learning.  I have a PING)) Ultrasound sensor on my robot and im just trying to get it to move forward than stop if anything comes in front of it. First i started by using a program to make sure the sensor was working (which it is) and to test the values. This is what i started with:






 LET DIRSC = %00000000

 PULSIN 0, 1, W0


goto main

T'rex controller fault

I have a new t'rex controller I intended to use with a wild thumper 6wd. While setting up the rc controls and testing the motor direction/reversing, I ran into a problem.  One of the motor outputs stopped working, and the fault led came on.  Both outputs were working initially, for about 20 seconds in total. But now this motor output goes straight into fault mode on power up.  Using a charged 7.2v NiMH pack btw.

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Arduino Uno and PIcaxe Instant Robot AXE408

Based on a recommendation from LMR  I purchased a Instant robot shield AXE408 which was rereported to be compatable with Arduino Uno. . After several trials I could not get it drive motors. I can make it blink LEDs , drive hobby servos. But cannot make motors run. I contacted PICAXE and asked for help.

Robot Servos/control board advice

Hi, I would like to do an investment and to buy some servos (10/20 units).

I don't have too much money to spend, so I'm looking for cheap servos with however enough torque to do some interesting robots (humanoid, arm, hexapod, etc).

Initially I found MG995/MG996R servos, then I found rds3115 robot servo.

The features of the rds3115 are:

Interrupt causes program to freeze?

Ive just added some bump sensors to my bot, simple switches. I have added them to interrupt pins so that the bot CANT drive into stuff. (i cant forget to include monitoring the bumps to every section of code)

Now i realise that one should always include ALL the code when posting to a forum asking for help, but there is an awful lot of it at the moment, so first i shall include the interrupt bit i have added this evening.

So i have added the connections for each bumper before the Setup.

const int RBump = 3; 

const int LBump = 2;  

modified servo .. continious rotation problem

Hi all ... have a little problem with a servo i modified for continous rotation 

#include <Servo.h> 

  Servo myservo;  // create servo object to control a servo 

  void setup() 

  myservo.attach(9);  // attaches the servo on pin 9 to the servo object 

  void loop() 

Beginner high school project - any help appreciated!

Hello, I'm a high school student interested in robotics and I just started my first project with some friends, but we're complete beginners so we're having trouble figuring out how to go about turning this idea into a reality..
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