Let's Make Robots!

Motor with encoder

Hello everyone. My college has some project organised, to introduce mobile robotics to highschools in my country, and they asked me to design a robot which would be used for that. And it needs geared motors with encoders, and since the only thing I ever used was servos, I need help choosing them.

Fan slow down

Hi. Does anyone know what happens when I slow down an AC fan with a diode to kill one phase? (I tried it, it slowed down, but I don't know will it keep working like that)
Please answer asap, I made an incubator which has 17 eggs in it now, and the airflow is bad in it, my 12V DC fan is too slow, and only stronger fan I have is too fast. Lives of little chickens are at stakes here, help please!

Basic electronic sets

Hello everyone.

I teach a robotic group, and last week we decided it was time to stop using kits and start doing something on our own. So we collected 20$ each and we need help at choosing the best stuff to buy.

We buy from local shops, 20$ is just so you know aproximatly how much we can spend.

We have tools already, we need just the electronic stuff. So i was thinking of getting:

3-dof biped

Hello. I had a plan of making a biped with 3 dof on each leg, so it could walk with lifting legs and not by sliding.I tried 2 different designs and none of them worked, it would fall down every time he tried to move the balance to one of the legs. Then I read an article that said that you can do what i want with 4 dof-s, but without the knee joint, and then movement looks weird becouse it has to swing his leg around for climbing and stuff like that.

So my question is, is it possible to make a 3dof biped that actualy walks?


I got a room that me and my brother can use as a lab if we make it usable. We'll make it a place to hold our server and all electronics stuff. Here are some pictures, and I'll update this blog as I make improvements.

This is the entrance to the lab


Servo motor for industrial arm

I have a couple of questions about buying servos. And I don't know how to google what I want so I will just ask it here.

I need a servo that has torque around 1500kg/cm. It can be AC, i have 220V for it. And it musnt be to heavy, becouse i need to make an industrial arm with it, so one would carry atleast 4 more. I would just like links for shops where i can buy that.

A vibrating robot I made for my little brother's 10th birthday. It has 2 batteries, a led and a vibrating motor from cellphone, all on a 20pin IC stand. The 2 … Read more

Intellibrain problems

Hello everybody. I'm trying to get my intellibrain bot to comunicate with arduino via I2C, but I get some errors which I don't know how to debug. Google doesn't help at all. Here is what I get on my display when I turn on the program:
"Code: 20&97b6 
8d57 8d24 839d"
and after it shows that very shortly it turns the program off. It happens both when arduino is on and when it's off.

nothing yet, soon it might walk
Using a
A.P.O.S.T.O.L. is short for Armoured Prototype Of Systematic Takeover Of Land. It doesn't make much sense, but when me and my robotics group were thinking of a name … Read more

Many questions

Hi everybody. I have alot of questions and don't know how to find answers for them, so I would be very gratefull if you could tell me a precise location where to look for my answers.

So the questions are:

1. How to connect arduino severino to intellibrain board? I need to connect 3 of arduinos to one intellibrain only to send commands with coordinates so the arduinos can calculate the angles for servos to put the legs there, so i would only need to send 1 boolean to choose a leg and 3 integers to specify the coordinates.