Hello all!

I am building the $50 Robot, but instead of the HS-311 I got the HS-322HD because they were stronger for only a buck more. However, when I needed to pull out the pot slot from the main gear, I found that it was all one gear, so I could not pull it out. How would I get rid of the slot (This is a nylon gear.) I was thinking of drilling the center out. Would this work?

Loco Robo

For that kind of torque, I'd be a bit hesitant with said price tag.  Who knows though, they could end up putting out rated power.

Okay, so I am relatively new to this.  I have an Windows XP system, and I have had problems getting the ISPMk II to program an Axon board.   I am using AVR Studio 4.  When I did the install, I installed the USB Driver like it wanted.  Can anyone find any problems that I am doing and help myself out with this programming problem?

I am sorry if someone already has posted this problem on the forums, but I couldn't find it.

Hi,

A T-circuit is something entirely different!
It's commonly called a Half Bridge (some call it a half H-bridge, since two of them mirrored gives an H-bridge, but the name must be born in the mind of a dyslexic).

Pro: Only takes half the power elements of a Full Bridge.
Con: You need twice the voltage to get the same job done.
Deadband: Is something you resolve before such a simple circuit.

No need to jot down your own wiki - you can find tonnes of material on the Half Bridge (it's even mentioned on Wikipedias page on the H-bridge and most pages on the H-bridge worth their salt will have at least a paragraph or two on them (and there isn't really material for more in a Half Bridge).

A much better solution, when you don't want a Full Bridge/H-Bridge, is a relay (+ a MOSFET if you need speed control).

Hi Neil,


Not at all.


I'll do my best



Oops Sorry 

You do know that the purpose of this part IS to "flatten" the signal (make it very close to DC), right?

Please swap in the 1µF again and then measure:
- The DC level, which should be around the 6V mark
- In AC mode, crank up the sensitivity (V/div) until you either get the waveform to fill at least 5 or 6 divs  or reach the max. sensitivity and then tell me the amplitude (or snap another photo of each measurements annotated with V/div).
For the latter, please slow down the timebase to get, say, 3 to 10 full periods  in each horizontal division.

When this is done, I think this part is finished and only needs to be checked for mean voltage out vs. frequency in (from eg. 75Hz to 85Hz), Input on one trace and the output on the other.

For those who live in Pittsburgh, this is a show by the CMU Robotics Club. Definitely worth seeing. They plan to make a YouTube vid for everyone else that can't make it

I am making a turret and I am looking for servos.  The turret will weigh around 5-7 pounds and so we have been looking for servos that can give out tourque that is twice as much as we would need.  I found these servos and I was wondering what your takes are on them because they seem to be extremely cheaply priced.  Has anyone used these?

http://www.dpcav.com/xcart/product.php?productid=16491&cat=255&page=1

Here are the rest of the pictures up to TP5

Well Hello Mr Soren

Did you think  I gave up?

I thought I was going to have too! I could not find the problem for a long time.

i am now using a fused 350 watt PC power supply and it seems to work great.
 
Then I remembered about grounds making circits go nuts so I went along and made sure they were rock solid and together and wallah it was all better.

Anyways here is what I have for you, I had to make a couple changes, Don't roll your eyes......

The problem I was having was after I cleared the noise I was having on the circuit caused by bad grounds, was when I reached TP3B and put in the next part of the circuit.

 The 1uF caps flattend the signal so there was no wave form  I had to use  2 - 10nF for C3 and C4.

Here are the pictures of the wave forms I hope they will work for the project?

I have a two transistor motor driver and I'm looking for a thorough information page on it.  I cannot use an H-bridge for this application.  I repeat, please do not suggest just using an H-bridge.  Does anyone know of a site that has more information on the two-transistor motor contoller.  I've included a .jpg for the driver circuit.  I've hear it called a t-circuit, but that didn't show up in Google either.  I'm looking for information like, actual name (if there is one) pros, cons, deadband issues and solutions, basically stuff that you would put on a wiki page (which I might do afterwards cause there isn't one for it at least that links from the motor controller page like there is for H-bridge).

Thanks!