Let's Make Robots!

How to build your first robot - Part II - navigation


Your browser is not able to display this multimedia content.

Your browser is not able to display this multimedia content.

clean_navigation.BAS6.17 KB

This is Part II of How to build your first robot - tutorial.

you can just take the cool navigation-code in here and have fun with it, or you can follow the whole instruction, or the parts that you like. I try to make it as general and open as possible.

Here is part III of this tutorial - I recomend that you browse this as well!


You have made a robot, something like this: How to build your first robot

You have read my deep thoughts on how to move on with the programming "Don't program your robot.. Teach it!", and you have made tricks with your robot, messed around with it, had some fun and is ready to move on.

Perhaps you have tried out this little trick of seeing what your robot sees.

You have seen on the video of "Making Skiwalker", and seen on the pictures of "Yellow Drum Machine" (the pics in the bottom) - that you do not need much for materials to make a robot; Melt-glue, double sided tape, sticks, and you are go!

If so, this part II should be a breeze! You can make this robot in 45 minutes, no sweat.


First, let's make the robot on the picture above. Try to duplicate the main parts, that is the main task here.

It shuld not need much explantion, it is excaxtly like the one from How to build your first robot - only differences:

  • Instead of Sharp sensor, I use SRF05
  • The servo is a smaller one, and a fast one - you can get these in any size and speed
  • The gearing on the motors is lower, so I have a faster robot (though it is not a speed-king, lol)
  • instead of just taping it all together, I have used 3 sticks to form some sort of a "chassis"

The closer you get to this, the easier it will be to follow the rest, but of course you can just do it your way, with whatever parts you have etc.

In the first tutorial I wrote that you could make some fancy code for the robot.

I now present you for some code that I have made, it is what is used on the video. It is an example, there are thousands and millions of ways to evolve, you should do it your way. This is just to try to open your eyes, and share what I have learned after countless hours of trial and error.

Try to alter some of the numbers to tune in to your setup, and read the guidelines in the code. That way you can get a robot like the one on the video, and we are going to use that as a base for Part III in this tutorial...

Find the attached code in the top of the post.

.. And the screwdriver-trick on the video?

Well.. Look for places where the code says

servo Servopin,head

and add, just after it

servo 1,head

If you are adding another servo on pin 1.

Think about what to attach instead of the screwdriver?

Something with an LED on? And insert some on/off in the code for the LED? Or a fan? or.. :D


Stay tuned. This bot is getting more enhancements now..

And if some of the comments below does not make sense, please understand that I am changing this over time, so the comments may have been for an earlier text here :)

Thanks, and do post what robots you make, to inspire back. Thank you.

/ Fritsl

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

A great Robot Frits! It looks even easier to build than the one you presented in part 1. And the picture is so well done, how do you do that? It almost looks like product placement.  


We don't stop playing because we grow old, we grow old because we stop playing.

Thanks :)

It was just my mobile, and I just put it on a printer, and a lamp on the side.. 2 seconds, first shot :D


/ Frits

Looks like another great introduction robot from the frits :-).

I have got to get me some of those small servos - neat! Already I'm fantasizing about a servo arm on my radio controlled arm to pick up stuff :-).

- Jimmy

some leds for eyes and a piezo for when the sensor runs into "DANGER" would make it come to 

life even more! Great Job man! 

Man, your behavior seems much more smooth, lifelike, and controlled than mine. I'm definitely going to have to spend some time studying your code.

That was pretty kewl ! i havent made a robot yet but im etremely enthusiastic.

loved the music by the way

My local RC-shop :)

It is a very common servo-type!

/ Fritsl

Erh.. No - it is a very, very standard servo. 9 grams, as I recall it - but look anywhere they sell servos, they have it :)

/ Fritsl

If you want a model number, the servo in the picture looks really similar to the HiTech HS-55's I just picked up yesterday. I'm sure there's a lot of these 'feather' or 'micro' servos that look similar, but that's one model number you can go look for at the hobby shop.


just about 52 seconds into the video how come the robot misses the box by like mills. or is that really advanced navigational techneiques only for like fristz and what not.