Let's Make Robots!

The G_Bot

Runs around sees things and avoids them and perhaps makes some robot noises via a speaker

Hi everyone.

I am Giovanni Izar.

I am brand new to robotics and this will be my first attempt at making one. I will call it “The G_Bot.

I have skimmed through the rules and intend to follow them but forgive me if I stray and correct me when I screw up.

I have all my parts but I am not sure if they are all correct so if anyone can spot something wrong or out of place please let me know.

When I got my Picaxe 28x1 it came with a 3 battery holder. (I got myself a 4 battery holder from RadioShack (The Scource in Canada).  This immediately got me thinking voltages and I have concern about whether the motors I have will hold the voltage I will be feeding them.  I guess they will just go faster but  I will be watching for smoke none the less.

The servo I got is a continuous rotation servo. Will this be ok?

I like the look of the Tamiya gearbox i found and decided to use it instead of the G9 motors in the Start here tutorial. I may get the G9’s later.

The sensor I got is listed as a GP2D12 and not GP2D120 as noted in the tutorial. I hope it is the same thing

I forgot to order the servo chip so I am going with the resistor instead.

I got all my parts 2 days ago but could not get myself to start until I had read enough here, photographed and documented everything.
I am a CNC Programmer Machinist and will probably make my own wheels.

I am now ready to make a robot and hope to get some input from some of you.
Knowing me this Robot will look nothing like I expect it to look right now and will probably take much much longer to build than most of you because I am never happy with what I produce the first time round. For instance I will probably turn out 6 pairs of wheels before I am happy with it.

My Photos are at www.izars.com/robo

I own the domain and am prepared to dedicate it to LMR if that is a good Idea

Whish me luck.

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Hey g_code, I suspected you might be a 'CNC person' judging by your name =)
I've used the same Tamiya gearbox at 6V before with no problems. You will however need some kind of motor driver - at the moment you have nothing capable of handling the current needed to control the motors.

Hey g_code!

Very much welcome here, and thanks for posting and the offer regarding your domain.

However, I will have to ask you to please read the Rules

Thanks :)

Thanks for the welcome Frits.

I am not sure why you say I must read the rules.

I did but I think I am lisdexic and may not understand it all;-)

Could it be that you want the LMR logo there (It is there now take a look :)

Could it be that I should not use my own Domain?

Or is it because My Robot is not yet complete? I did ask about it in the shout out and was told that I had to have started it.
I actually did start it last night (Assempled the controler and soldered wires to it.

Please let me know.

As I said my domain is available for any kind of use as I just use it for email addresses and My resume.

I DONT intend to use it for Spam or advertising.

LMR Is my latest addiction and wish to be an on going part of it.

Thanks again


It was merely because your picture was a picture of a third party product. And the rules state that you need to have "something to show" before posting as a robot. A third party product case is not that something, that's all.

The reason for all this is is just that we woudl get a lot of "i intend to build this", posted as robots if the rule was not there.. and that would make a sad collection of robots, these things should be in the blogs.

All cool, no prob, have fun, and thanks again for joining in :)

You keep referring to "the tutorial". Do you mean the "start here" tutorial?

The GP2D12 is NOT the same as a GP2D120. The GP2D120 has a much shorter range than the GP2D12 (4-30cm vs. 10-80cm), but is more precise within that range.

As TeleFox said you need something to drive your motors capable of providing the current your motors draw. A resistor (as you mentioned?) isn't gonna do it.

A servo for continuos rotation has been modified to act like a dc motor. You no longer control the ANGLE of the servo but rather the SPEED and DIRECTION, which isn't very suitable for mounting a sensor on top of it.

PS: When fritsl asked you to read the rules he probably meant this: "Do not post as a robot if you have not built anything". Your entry would be more suitable as a forum topic or a blog entry ;)

Hi and thank you for your input Aniss1001

The GP2D12: Will it work or do i need to rush out and get the right one right away?

Motor Driver: I do have the driver chip I just forgot to mention it in my post. (I will whip myself 7 times before going to bed tonight for forgetting)

The Continuous servo: Again, Will it work or do I have to rush out and buy the right one. If you mean its going to be more difficult to program but will still work I would be happy with that.

If I have to go out and find the right parts I will whip myself from now untill I get the right parts.


Thanks again

GP2D12: It works fine. It just depends on the RANGE you want detect. I read that the two sensors have the same elctronics and just have different lenses (therefore range). I prefer and use the GP2D12 because it has longer range. This mapping test I made is based on a GP2D12.

Continuous servo: If you plan to mount a sensor on i, it's no good. You have no way of telling in which angle it's pointing (see my former post). So yeah I would get a NORMAL servo for that job. 

Motor driver: What chip did you get? Make sure that it can supply the current needed by your motors.

PS: Please stop whipping yourself :D

Igot the LD293D

I'm using an L293D which (as I recall) can provide 2 x 600mA. Dunno what difference between the two chips is? :/

Anyway check the specs on the chip and your motors and see if they match...

Sorry Aniss I made a mistake (again)

I Have the same chip as you, the L293D.

I have learned that the motors are type FA-130 and are rated for 3 volts

I dont know what type of current they use and I am trying to find that out now.

I am very raw with all this electronic stuff and have a lot to learn. I wish I could just download it all directly to my brain.