Recent Posts

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Misc / Stepper driver
« Last post by drinu on March 31, 2014, 02:35:13 AM »
Hi all,

Have anyone ever used the TB1H stepper motor driver? I read on the net that it only provide the motor with 30% performance due to the bad design (selection of internal components). Is that true?

Any help will be appreciated.

Thanks in advance.
Electronics / Beginner supplies/common parts
« Last post by Ibaeni on March 30, 2014, 07:59:13 PM »
Hey I've been looking around for a generic list of materials/supplies that would be useful to begin working with electronics. I've been unable to find a good one, so I was wondering if you could help me. I'm looking for the basic things I'd need to get more into robotics. I've been working for a while but do not have too many parts. I have a decent assortment of resistors and LEDs but was curious as to what other things could be useful like what value capacitors are must-haves etc. Thank you for the help
Software / Re: UART settings
« Last post by strat321 on March 30, 2014, 12:26:06 PM »
Thanks Webbot.
Software / [Arduino] Controlling a self modded continuous servo [Solved]
« Last post by microzee on March 30, 2014, 11:09:05 AM »
Hello, so a while back I built the 50 dollar robot, but decided to use something a little more usable so I bought the arduino. The problem I'm having is controlling my servo. I followed the 50 dollar robot guide, I bought a hs 311 and opened it up and cut the stuff glued etc. Now on my arduino, I want to be able to control the servo speed/direction. In the 50 dollar robot guide it says this:

Send PWM to the servo. You will notice that by telling the servo to go to a particular angle, instead it will rotate at a particular speed. Neat, huh?

So in the arduino IDE I send a particular angle to the servo. Guess what? it rotates at one speed no matter what I send it (direction sometimes changes). Also there's no way to stop the servo.

see this:

I might need to set:
servo.attach(pin, min, max)
min max values?

The other weird thing is right when I attach the servo without even writing any data to it, it starts spinning. Maybe when I modded it the pot wasn't at 0?

Solved -  The pot wasn't in the right position.
Mechanics and Construction / Re: Electronic components
« Last post by Gertlex on March 30, 2014, 09:03:24 AM »
Digikey is good if you know what you want. Mouser is similar. The better price varies between the two.

For resistors/capacitors, I'm a fan of the Joe Knows kits on Amazon... a wide range of values, pre-bagged. Then you can buy extra of commonly used components and stick them in the corresponding bags. (I don't do nearly as much stuff as JWatte does, so he probably wouldn't do it this way ;) )

I've made use of ebay, too... when I really need just one thing (e.g. I needed some 16 MHz crystals a few months back)
Mechanics and Construction / Re: Artificial Muscles from Nylon Monofilament
« Last post by jwatte on March 29, 2014, 10:18:47 PM »
I've been wondering if someone could build these muscles on the inside of a tube, and run hot/cold oil or water through the tube to contract/expand. At the top of the tube, you'd have entry of both a hot-oil and cold-oil recirculating system, and you'd use a vent to let one or the other in to expand/contract.

Mechanics and Construction / Re: Artificial Muscles from Nylon Monofilament
« Last post by WriterOfMinds on March 29, 2014, 07:34:13 PM »
Another update, and this one has videos of working muscles!  I also discuss the different types of heating element that I tried out.
Misc / Low cost Arduino's from Sparkfun, Today only.
« Last post by knossos on March 29, 2014, 04:39:24 AM »
Just a heads up.  Sparkfun is selling several versions of Arduino and compatible boards for a significant discount.  For example the Arduino Pro Mini is $3 and the Arduino Uno R3 is $18.  Lots of the items appear sold out, but the price is valid for backorders.  Sale ends today (March 29th) at 11:59:59 p.m. Mountain Time.
Mechanics and Construction / Re: Electronic components
« Last post by vipul1994 on March 29, 2014, 02:32:24 AM »
Where is the best source of buying electronic components (diodes, resistors, capacitors, ect) on line?  I don't want to buy everything from ebay and pay separate shipping for each purchase...

Try this -->>
Hello @jwatte

I am a rookie right now in hardware and robotics world and am a student of Computer Science.

Ok i figured out that you would be needing the numbers first
so here is the table of the same below

Robot Dimensions700mm x 700mm x 750mm (l x b x h)
Weight Max.35 kg
Coefficient of friction0.8(Guessed and searched on google need help on this)
Tyres Diameterwill be max 4.5-5.5" (Not decided)
accelerationNeed Help (I am making for war so speed is not that imp but i need acceleration Please suggest )
WeaponTill now only very high dragging and wedged shaped robot design
Max Budget$670(INR 40,000/-)
TradeoffEfficiency is very imp after that its cost then weight is secondary so its 3:2:1

BTW thanks for replying i am trying my best to answer you if i am mistaken or you need More info please feel free to ping me at or firebladevips[at]gmail<dot>com

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