Let's Make Robots!


question on a h-bridge circuit I found on this page

Hello everyone,

well, I´m pretty new to this community and I hope this post is not too dumb in your eyes. I´m more at home when it comes to computers but as soon as I get into contact with circuits and means to make a computer sense the "real world", I thought about giving it the opportunity to drive around next to other actions. In fact I´m trying my best to deal with microcontrollers and learn by doing.

Just made my first SMD soldering

Today I made my first SMD soldering. This is where I started:

FT232RL and SSOP28 adapter

And this is what I ended up with:



I'm getting a new soldering iron to build my first robot. I bought the LMR bundle and was wondering what would be the best iron and tip for this. Also, what would be the best kind of solder to use? Thanks in advance.

Propeller Platform Video Howto

I got a new camera for Christmas (Happy New Year!), and I decided to make a 'how to put together a Propeller Platform' video.  Are these types of videos useful?

I don't think a video alone is enough for a howto (the Prop Platform has a written guide, too), but I was thinking there are a few 'advanced' techniques that beginners might benefit from seeing on video.  What do you think?

Photocell to motor circuit not working. :(

Ok, to make sure I would not mess up I got a little help reading the circuit from Instructables. After following this word for word, I found that my circuit simply did not work, and when I touched the transistor it was extremely hot.


Here is what I put together following the instructions:


[Honestly, that's the best photo I got.]


No cables... solder some?


 I made my first newbie error and sent mail rather than a post ;) However -

I have all the parts for the simple robot, the one in the 'how to make your first robot' section' But i didnt read carefully and forgot to check parts.. so my sharp sensor doesnt have cables!

wondering if anyone knows how to solder a set of wires and make your own cable - im generally quite handy with my soldering iron ;)

 Kind regards,



Soldering iron not hot enough?

I've got a really crappy soldering iron so that very well could be the cause of my problem, but I want to be sure before I head to Radio Shack and drop some cash.  See, I know that you're supposed to heat the connection and then apply the solder onto the joint, rather than putting the solder directly on the iron and letting it melt.  But when I use the correct method, the joint doesn't get hot enough for the solder to melt!

Soldering :P

Hello, i need help :)

I have a perfboard, of the kind with all holes isolated from each other, like this one. I then have two of this male header strip inserted on the perfboar, parallel and spaced by one empy hole row. Now i have to solder the pins of one line with the one of the other, it making many 3-holes connection bridges (i hope i explained clearly).