Let's Make Robots!

Dagu Rover 5 Explorer Kit and Red Black Spider Problem

I am just starting out trying to build my first robot and purchased the Dagu Rover 5 with Explorer PCB, motor controller and Red Black Spider (Ardunio Mega). The Dagu Explorer PCB has IR LED on each corner with a greed LED and instructions that say the LED will light when the IR LED is active. I have connected a HIGH pin out from the Red Black Spider to one of the signal out pins for the IR LED on the explorer PCB but the green LED does not light - any thoughts on what I might be doing wrong? Thanks, James.

Text and logos onto plastic?


I noticied that some people apply text onto their robots.

I thought I would ask the question as someone may know, even though this is not limited to (in my case) robots.

Basically, what are my options for placing text and basic graphics onto ABS plastic, or especially ABS plastic enclosures.

I do not have the funds to send the unit out, use silk screen printing, lasers etc etc.

I would like a simple solution that I can use at home, with my inkjet printer.

Driving One Stepper Motor With L293D Using Two Pins

Question: Is it correct, that when I solder the following circuit there are only two pins nessessary
from the microcontroller to the L293D to drive a unipolar stepper motor ?

Answer: Yes. That is correct.

Question: Are the two NPN transistors and the 10kOhm pull-up resistors responsible for the signal inversion?

Answer: Yes. That is correct.


How do you determine pins on relay?

I got this relay today but not sure how this relay works. Try to search on this particular relay but not much information or datasheet. I tried to wire it around and find out if I connect A and B with battery I can hear the TIC sound so I assume C1,C2 will be connected or C2 and D2, however it doesn't work that way. If I connect the battery on C1 and D1 and connect a motor on C2 and D2 the motor will work. So, I guess C1 and C2 is linked and so as D1 and D2.

New LBD geared motor for small robots

DAGU have now released a modified version of our Little Black Duck analog servo.

This is the Little Black Duck servo, modified for continuous rotation with the control circuit removed making it into a simple geared motor with a ball raced output shaft. This motor is perfect for small robots and can be easily driven by an L293D or a controller with a built in "H" bridge such as our Micro Magician.

Help with Micro/Mini Gearhead motors for tiny bot

Ok so if you've read my profile here, one of my goals is to create/produce a low cost, versatile micro/mini robot that could be used as a swarm bot.

Currently I'm trying to source some decent tiny gearhead motors for under $12 dollars. Today I've come across these:


and this



Also there are some 3V gearmotors of the same dimensions with varying RPMs (from 30 to 100rpm) available as well. The torque ratios are not given for those, however.


Hi, can I use in circuit however big capacitor or do you know some article about using capacitors? Thank you.

cheap sources for mini-motors?

I'm putting together a project for school kids, so I need to find a volume source for both small dc motors and servo motors.

Like this one:


and the ones found in lumi's ALF project



Autonomous navigation strategy: how to move forward from basic to advanced?

Last week my Rover 5 completed his first tour in our living room avoiding obstacles / no bumping ;-).

The Rover has the following sensors / inputs:

The Parallella Board?

I was wondering what people think of this board and the supercomputer that this guy built with them.

The Board:


This guy built his own supercomputer with 8 of them (each with 18 cores) wrapped around a gigabit switch and a couple of Intel I3 NUCs.

The Supercomputer:


Wild Thumper Controller - Packaged Software has Issues

If you are trying to used the Dagu motor controller with their Wild Thumper vehicle, which is great, but can't get it to respond properly to a RC tranmitter, make the following changes to the software. Get off D0 and D1 and move to D9 and D10, which are PWM channels. You don't want a PWM repetative pulses (every 22ms from a Spektrum transmitter) to clobber your serial interface when loading programs. This is why you get a sync error from the compiler if you follow the manual.

Perpetual Hangout

Frits asked me to mention that when there is someone in the hangout we can invite those that can't join on their own if they will post their email, or, their name on G+. He would like to get input on how we could make use of the Hangout

Thoughts? Ideas? Concerns?

Updated instruction manual for Mini Driver

The Mini Driver was released by DAGU some time ago. It is essentially our Magician controller in SMD format. Unfortunately the engineer who designed it does not have very good English so I was asked to re-write the manual. You can view/download the manual from here: https://drive.google.com/file/d/0B__O096vyVYqczRjX1k5LTRkcjA/edit?usp=sharing

New tutorial on how to make an Arduino robot

I posted this on the Facebook page, but thought I'd post it here as well.

I just finished writing an in-depth tutorial on how to make an Arduino-based robot. It's targeted towards beginners and should help someone completely new to robotics to build their first robot, but anyone making a robot with an Arduino will find it useful. Here's picture of the robot I make in the tutorial:

The Raspberry Pi Powered PiBot

                                                                          The PiBot Website