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51
Electronics / Re: PCB design problems
« Last post by tinkerbee on May 17, 2013, 02:02:07 AM »
I know this is probably stupid but would it be possible to use a conductive pen for spot repairs?
52
Electronics / Re: PCB assembly company recommendation?
« Last post by tinkerbee on May 17, 2013, 01:59:27 AM »
For a shop in the USA that will do prototyping, small batches and low volume runs (all machine placement) try www.TinkerBEE.com.  We have a MannCorp MC385-1V1 collecting dust that needs to get used.
53
Electronics / Re: H bridge voltage drop
« Last post by jkerns on May 16, 2013, 08:00:13 PM »
Quote from: javaman on March 18, 2013, 04:57:59 PM
I start suplying it at 6v with High and low signal for make it rotate free but I measure voltage at out pins on L293 and it shows 3.4 v (@ 0.76 A), I think it's a high voltage drop for it.

How are you measuring the voltage? What is the duty cycle when you  make the measurement?

From your description, it appears that you are measuring the voltage while applying a duty cycle to the bridge - if that is true, and you are using a DC voltmeter you might see the average voltage being supplied which, at a 50% duty cycle would be about 1/2 your supply voltage.
54
Misc / Robot programming competition! Win 2000€
« Last post by gomez on May 16, 2013, 03:48:04 PM »
Hello,
I'd like to invite to participate in our programming contest!
You can win 2000€ and many other prices like cell phones or tablets!
The point is to create a virtual buddy.. its purpose is on you, it can educate,entertain etc..
Everything important can be found on website http://buddypaddy.com/ and facebook page https://www.facebook.com/interactivebuddycontest
Hope to hear from you!
55
Mechanics and Construction / Re: micro arm joints
« Last post by johan on May 16, 2013, 03:08:13 PM »
D'oh. It's actually been a while since I've been to this site and I'd forgotten about all the reference material here. That gearology PDF is pretty awesome.
56
Mechanics and Construction / Re: micro arm joints
« Last post by johan on May 16, 2013, 02:52:26 PM »
Thank you very much, appreciate the response. Your methodology for making this, with motor last, makes a lot of sense. I'll go away and study the links etc - I have to say it's surprising that t'interwebs doesn't have some sort of wizard or findable explanatory site about combining motors, gearings and bearings!
57
Electronics / Re: PCB design problems
« Last post by felipe80 on May 16, 2013, 02:07:25 PM »
For Pad size calculation use this formula.
Minimum Pad size, P = (2 x R) + FA + D
P = Pad size, R = Annular ring, FA = Fabrication allowance, D = Drill or tool diameter

For hobby level PCB design, add 1 to 2 mm to drill size to get the Pad size. 
58
Electronics / Re: H bridge voltage drop
« Last post by felipe80 on May 16, 2013, 01:50:28 PM »
A separate supply voltage VCC1 is provided for the logic input circuits to minimize device power dissipation. Supply voltage VCC2 is used for the output circuits
59
Electronics / Re: DC Power Supplies
« Last post by felipe80 on May 16, 2013, 01:49:02 PM »
Normally we look for power supply with following features: Output voltage of 0 to 30V which is preferably adjustable. Current output should be at least 5A or more with current controlling option, short circuit protection, and thermal shutdown. It should be light weight and of small size.
60
Software / Re: My first little PID: please comment
« Last post by jkerns on May 16, 2013, 01:09:43 PM »
You can translate your desired speed to the necessary pulse duration or pulses per second (which ever fits the time scale of your controller). Or, you can take the pulse duration / rate and convert it to speed.  And away you go.
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