Let's Make Robots!

    

 

 

     This project is an attempt to make a low scale humanoid biped utilizing as controller an Arduino UNO and nothing more. The actuators will be 12x servo motor SG90. The legs will be a PLM (Parallel Leg Mechanism) kind, with 4 DOF each. The arms will have 2 DOF with a non-articulated hand. The head will be non-articulated too. I'll post each stage of this project with information and pics.

 

 

 

 

 

 

 

 

-- UPDATE - September 28, 2012 --

-- Legs --

 

     Another working day...

     Today I started to build a leg and also a foot.

     See below the pics of the progress.

     P.S. 1: I was thinking about the name of this project, I mean the "nano" word which completes the name. I think it's not appropriated, since the robot don't have a nano scale. So, I changed the name to Godo_mini.

     P.S. 2: I also added a video of a test of the mini PLM leg.

 

 

 

 

-- UPDATE - September 24, 2012 --

-- Arms changed --

 

     Birdmun has planted a bug in my ear yesterday, and it stayed on my head all the night. So, today I made some changes in the arms design and it's actually better. Thanks birdmun!

     Below you see in the two first pics the comparison of the two arm designs.

 

     With the new design the arms are around 1,5 cm closer to the body. In numbers may sound a bit, but it is really better.

 

 

-- UPDATE - September 23, 2012 --

-- Arms --

 

     Hi again. Today (nice sunny sunday) I dedicated some time to the arms of Godo_nano.

     Before I continue, I wish to say something that i forgot to say in the begining. The goal of this project is to make a humanoid biped with 12 DOF using an Arduino UNO and nothing more, only the 12 pins that I can utilize to control the 12 servos (SG90). Of the 12 DOF will be 4 in each leg (PLM legs) and 2 in each arm. The handsare notarticulated.

     Well, now I'll continue to show the today's work.

     As I have only 4 servos at this time, I resolved to start the work on the arms, instead of the legs that utilizes more servos (I need to order more). I started the work with a tiny bracket.

 

     Initially, I made this bracket to the legs, but can be used for the arms too.

 

     Then I started the construction of the arm.

 

     The "hand" I made with a plastic cover of an old HP printer.

 

     That's all for today, guys!

 

 

-- UPDATE - September 22, 2012 --

-- Torso --

 

     As I said yesterday, this weekend I would start to work in the torso. And as I already had a sketch, the work was fast.

     First, I draw the torso on a paper sheet, then glued on a 2mm polystyrene piece. NOTE: Polystyrene still my prefered material to work. AsI still havea small piece ofblackpolystyrene, I made ​​somebracketswith it.

 

     Then I made the holes with drill and after cut on the lines with a sharp blade ( like I did in the Godo V 1.0).

 

     With small pieces of polystyrene I made a battery holder.

 

     A tiny servo bracket with black polystyrene.

 

     After makingthe pieces,it's time toput everything together. Starting at the neck, made with nylon spacers.

 

     And here is all together!

 

     Next step is work in the legs or the arms.

 

 

-- FIRST POST - September 21, 2012 --

-- Square head --

 

     Hi guys! I started a nano mini version of my humanoid biped Godo. But this time I decided to start from the top, i. e., the head!

     Little has been doneyet,butwill posthereeach partisdoing.

 

     First, I made a manual conceptual design of the head. ;)

 

     Then, a few lines on a piece of cardboard.

 

     After cutting the cardboard, the next step was to make the red "laser" eyes, with pieces of acrylic.

 

     After uniting the three small pieces of transparent acrylic, two diagonal holes were made to fit two red leds. Then the laser eyes were fitted inside of the head.

 

     And this is the head completely assembled.

 

     In this weekend I'll work in the torso. Below are some drawings to imagine the construction of the torso.

 

     Above the battery, you see a voltage regulatorAs I am using a battery of 3.7 V, the voltage regulator is used to adjust the voltage to 6 V for servo motors.

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FrankNeon's picture

He's got arms!  For a second I though I should take a crack at designing one in CAD, but WHY? You prove that cardboard is the perfect substrate for invention.  Your battery holder was great too. I'm hooked for more updates!

lumi's picture

Great little brother. I will check if I still have some servos at home LOL...need to try this too. But sadly I do not have much time as I want to shrink my 4-leg insect bot too :-)))

 

Dickel's picture
Would be nice to see more of those walking around in the LMR, each with its own personality!
lumi's picture

For sure I will build a biped and with your detailed tutorial it's not that hard to build all the parts by myself. But right now there is no time...hope to start it in winter :-)

flyingchainsaw's picture

what are you using for fabrication? A 3d printer? or an XY table? Or are you just cutting material?

And if so, what kind of material? I would like to know because ive been using wood for so many years :P

Dickel's picture

I would like to have a 3D printer, but as I don't have, I use the tools that I have! I.e., a sharp blade and a metal ruler! My process of fabrication of the parts is very simple and, except to give "life" to objects, shape the plastic is the thing I like most in robotics! The material that I use is polystyrene, acquired in sheets of 500x500x2 mm (very cheap). The process of fabrication you can see in a walk through that I made for a DIY servo bracket (http://letsmakerobots.com/node/32828).

flyingchainsaw's picture

Thanks Man! i got an upcoming competition for robot arm and all of mine have been wood or alumininum (way too heavy)

this will be nice for a change :D

birdmun's picture

However, I would like to plant a bug in your ear. Your arms look to be a good distance from your body. Might I offer a second way to mount the servos that move the arm in and out? Build a mount that lets you mount said servos directly to the servos that move the arms up and down. Use the servo horn of the servos moving in and out to mount the arm. So, instead of the in/out servo moving itself, it is moving the arm. That should/would allow you to tuck the arms in closer to the body.

The above is just an idea.

Dickel's picture

I appreciate every idea / suggestion. And, really, this is a great suggestion, which made ​​me think of this change. Thanks.

birdmun's picture

Glad you liked the idea and could implement it so quickly. Looks like you were able to move the arms in about 12mm or so.