Let's Make Robots!

Question about cheap high torque servos

Hello LMR,

I have got some ideas for a bipedal bot, thus I need servos, that would provide some lifting capabilities. The most important thing for me is the price, since I could not afford a servo, that costs more than $10 (and even then I will eventually have to find a summer job and work my ass off to complete the project). I've managed to narrow the list to two servos : MG995 and HXT12k. However, as I can see from reviews, they lack quality, A LOT. 

Anyone from Denmark?

This year I am graduating from highschool, thus it is my time to decide where and what to study further. I may have a possibility to study electronics/mechanic engineering in some universities in Denmark. I would really appreciate some real information about them. This is what I can choose from:


Problems with usb programming cable

Hello, I am having trouble with picaxe USB programming cable (AXE027). I bought it to use on my lappy but it does not work properly. I installed all the drivers, checked everything many times but it still says "hardware not found on COM port" when I try to program the chip.

The picaxe programming editor says that usb cable is "ready for use", also the programming circuit is fine, since it works on serial cable. This makes me confused.

Any ideas?

Short question about Xbee connections

While sending information from PC to Picaxe (thru xbee's) the connection gets stuck (or you could say lagged) after sending continuous data for a few seconds.


Is this because I am using debug on the picaxe and it slows down the controller or is it because of some other reason?



Picaxe chip programming

Hello everybody.

I've gotten picaxe 28x1 project board, but now I really want to make my own boards. So I need to program the chips somehow. What is the fastest way to program, lets say, picaxe 18m2? (I would like to use these since they are very functional.)

Also, a few questions :

Multiple analog outputs

I need to connect 4 bend sensors to picaxe 28x1 four analog inputs. 

I would like to save some wire connecting by using the same V+ and GND for all four sensors and only use different Analog Output to PCU.

I tried connecting everything like this, but I get all the same resistance for all of the four sensors in the debug window.

I just hope you will understand my poor schematics :)

Questions about SD21 and xBee modules

My parts arrived today, but I cannot find any useful information how to connect them.
So, once again I am asking LMR to help me :)

The questions are:

Servos and a Humanoid

Hello everybody,

I just found a possible new chassis for my robot (pics are below). This time I want to go one step further and make a very simple humanoid.

So, the question is : how much servos should I need to make a basic walking for my robot?   My plan is to use 3x for every hand and leg, but I may be wrong.

Another crucial question : could THESE servos handle the job? ( My only option, because of their price - I'm almost broke :/ )

The chassis :


Problems with receiving a signal from LED020


I want my robot to be controlled via IR, I'm using LED020 receiver. I'm using this scheme:

And this code to get any readings from my remote:

symbol infra = b0


irin 0, infra
debug infra

GOTO WaitForSignal