Let's Make Robots!

Strange little thing

After taking apart all the old HDD's i ended up with a small piece that took me a little to figure out.

I stuck 5 volts on the wire and nothing happend. Well that's what seemed. Inside the copper sleeve is a small magnet. Tiny but it holds few grams. So I tried again, this time with the magnet holding a metal o-ring. And yes, with 5 volts it looses its magnetic capabilities. Amazing.

What a boring piece of kit.

Maybe suitable for a little spring operated hatch or a magnetic switch.

Could you pass me the salt please!

I found this kind of funny thing on the internet, especially for the ones with big diner tables :)

http://www.suck.uk.com/product.php?rangeID=140&rangeNew=1

Salt and pepper delivery by robot :-)

Inner wheel suspension

A small bot and suspension. Big task. But after taking some HDD appart and looking at round things for some time I came to suspension anyway. For a small bot this will work, i'll try and make it functional in the Rommel robot. You need per wheel 2 rings of let's say 1cm wide, a bigger and a smaller one (pick your size on availability). The inner ring will be connected to motor or axis. Arround that the second (bigger) ring goes, and the idea: in between you put some rubber or foam like material (depending on the weight of the bot).

Dutchbot PICAXE

Yes yes, after all the parallax troubles so far and waiting for their answer I decided to go PICAXE for a new small project. Got the start here stuff and spent today collecting parts from old hardware (such as HD's and printers). Now all I need is and idea. Got 8 steppenmotors, a solenoid and some other scrap.

But whats cool? I really love the design of some other LMR dude (robot that looks like 3 pebbles)........ Then again I have 8 steppenmotors (small ones)..... Don't know yet, design or laughs.......

Smoking PING)))) sensors

I didn't get arround playing a lot with my bot due to work/studie untill yesterday. Nothing changed and last time I used it all was fine and roaming (as shown in the video). So last night I had a visitor and wanted to show the bot, power on, but no movement. 2 seconds later smoke was comming out of the left and right ping (the little chip under the cq passed sticker turned to toast). I switched things off and checked for something that could cause a shortcut but all seems hooked up fine.

Anyone ever seen such a thing?

Hooking up a power LED

Hi Guys,

I installed a powerswitch on my bot that runs of an 11.1v lipo. Now I would like to hook up a LED that switches on with the power. Can I just connect a LED with a resistor to the switch (if so what value should I use)? Or do I need to use a voltage regulator to reduce the power?

It's roaming by now, I'll post some pictures etc. later this week. Did some serious liposuction on the thing and removed near to 7 kilo's. It's now small enough to run arround the house without moving the furniture or cause some serious damage to the kids :)

Reducing amp drawn on a dc motor

Hi there! 

Is there any easy way to limit the amps drawn by a electro motor? I ordered some good ones but am playing arround with a standard 360 one now. It comes of an rc plane, is small but rather amp hungry. Don't want to blow up the motorbee.

Best regards,

DutchBot

Strange servo movement

My servo's arrived finaly but now they don't seem to work. It's these:

http://hobbycity.com/hobbyking/store/uh_viewItem.asp?idProduct=8782

The parallax and the old servo's I used so far don't have any problems. But when I hook these up I get some really sputtering movements. Even stranger, they make little movements even when there is no code running. Anyone a clue?

4 wheels or not to 4 wheels

I want to add 2 extra (fixed) wheels to my bot (front end) but wonder how that would behave when steering. Steering will be done by the motors on the rear wheels.

DSC00673.jpg

I'm redoing the base, it will have some suspension underneath the turret and a bit more batman like features (as I'm waiting on my servos still).

DSC00675.jpg

Is it possible to program a pic16c745

So I got the motorBee to work and pretty much doing what I wanted so I went on to the DigiBee+. Got some code off the site and started to play arround (visual basic, steeeeep) but eventually i managed to make the pir sensor turn on a led. On to the servo's. I read down the site 3 times, spent another 4 hours of crosseyed looking at my silly programming (pobably) but wasn't able to move anything a bit.