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31  Using Arduino / Motors, Mechanics, and Power / Re: Relays interrupting program on: October 19, 2013, 12:06:19 pm
dont know the answer, but a suggestion,
 
   use a bettery to temporarily power the arduino and the inouts to the optos,

that way the arduino is totaly floating from therest of the circuit.

check that by with no power connected , checking the resistance from the arduimo earth to the real earth, their should be no contact.

then with a floating arduino see if the problme still happens.

if it dosn't, which is my guess, then its the power to the arduino that is glitching,

if it does still happen, than you either have one heck of a emp from the controls, or the optos are not working,


     
32  Using Arduino / Motors, Mechanics, and Power / Re: Relays interrupting program on: October 16, 2013, 01:33:10 am
ah such a simple problem,
 
with so many potentials to go wrong.

as the previous contribute said, a circuit diagram would be good.

whats happening is the relay switching is giving a great kick to the power supplys, which is getting into the arduino,

are these relays opto isolated, if they were that would help.
33  Development / Other Software Development / Re: What is the best way to get rid of the standard Arduino IDE ? on: October 08, 2013, 02:18:19 pm
slightly off topic, but related.

my daughter has just found the perfect way of getting rid of the arduino ide on my test machine,
   she found the FDISK command equivalent in the windows command structure.

Ah well,

 
34  Using Arduino / Motors, Mechanics, and Power / Re: Vibration Motor Strength on: October 08, 2013, 02:12:04 pm
interesting project,
   
My guess is like above, give it a go.
    Haptic feedback is just a standard motor with an out of balance mass on it,
        the mass and the amount of time its on could limit the life time, bearings wearing out.

there are plenty of motors available from the big distributes.

alternatively, have we considered led indicators,

have fun, let us know how it goes.


35  Community / Website and Forum / new web site , screen size changed ? on: October 03, 2013, 02:38:10 pm
whats this with the new web site,

Ok, Im on a netbook, using chrome,
    BUT

the new site,
   fonts are blotchy, and the window you use does not fit on the screen any more,
       its as if you have set the minimum / fixed size of the window bigger.
 
I have to scroll across the screen now to see the right side of the web pages,

the screen is 1024 wide, have you changed the web such that I need a bigger resolution than that ?

36  Using Arduino / Motors, Mechanics, and Power / Re: Drive a 60 W Peltier with Arduino on: September 30, 2013, 02:29:35 pm
sounds great fun

remember you are pumping 60 watts of heat into the thing,
   which you have to get rid off as well,
37  Using Arduino / Motors, Mechanics, and Power / Re: Snubber for AC blower on: September 30, 2013, 02:21:54 pm
do you need a snubber ?

whats it like without a snubber ?

38  Topics / Robotics / Re: PID algorithm for line follower on: September 22, 2013, 01:38:40 pm
u need to put print statments in the code,
    and print out to a terminal,

u end up following the robot with the laptop,
    and grabbing a lump of data , but you should see whats happening

39  Topics / Robotics / Re: PID algorithm for line follower on: September 22, 2013, 01:25:25 pm
have you looked at how the values of integral, proportional and derivative change over time

contrast and compare when its following a streight line, against when it on  curve,

40  Using Arduino / Motors, Mechanics, and Power / Re: Can Aluminum Oxide be polished? on: September 22, 2013, 02:48:26 am
Aluminum oxide is VERY hard,
   so polishing in itself is difficult but not impossible.

thats you direct question, 

but

So Al is very reactive, and the air is full of oxygen and water vapour.
    so Al "rusts" ( oxidises ) almost instantly its exposed to the air ( as said above )

and forms a layer of Al2 03 on its surface.
    luckily, Al2 03 is very none reactive, and resistant to O2 and H2O penetration.

which slows the rest of the Al reacting.   Else we would not have any Al in the world.

Great mirrors are formed by depositing Al on to glass under a none reactive atmosphere,
   the glass gives the protection required to stop the Al reacting. The back of the mirror is then covered in something to stop the back oxidising through.

Car light reflectors are commonly made with plastic and a Al cover.
    Some food packages have a shiny Al coating.

So you friend is right, as are you.
   Al will keep reacting, and will eventually pit and dimple.

Give Al the right conditions, it reacts so strong it burns,


It just a matter of the environment your in, and the protection you can give it.
41  Using Arduino / Motors, Mechanics, and Power / Re: Help understanding a circuit driving a high power solinoid. on: September 22, 2013, 02:36:41 am
my bet is its an old circuit,

from before MOSFET chips were common, cheap , large enough or reliable.

having said that, in some circles Darlingtons are considered more robust than MOSFETS,esspecialy in military products,


   
42  Topics / Home Automation and Networked Objects / Re: Looking for arduino controlled 220V outlet or powercord on: September 21, 2013, 09:13:14 am
X10 is your friend,

have a look around,
   here might be a help

http://forum.arduino.cc/index.php/topic,37918.0.html

plenty of X10 mains modules available off the shelf,
    and arduino via shield talks all the bits needed.

else a relay is a good answer for simple on / off.
43  Using Arduino / Motors, Mechanics, and Power / Re: Help understanding a circuit driving a high power solinoid. on: September 20, 2013, 03:00:12 pm
the 2k7 is to pull the base down as you say.

with out it,
   you can drive the base high, but there is no way to take the base low, due to the diode.
       
The value, is probably a compromise.

when the tip is 'on'', i.e. the base high, then the 2k7 is dropping most of the power ,
    any lower and the dissipation of the resistor is going to go up.
         any higher, and the base leakage is probably going to be high enough to bring the base high,

4k7 would probably work, 10 k might not,


44  Using Arduino / Motors, Mechanics, and Power / Re: Help understanding a circuit driving a high power solinoid. on: September 20, 2013, 02:17:31 pm
that circuit looks like its designed to take 20 plus amps,
    does your relay need that much drive current ?
45  Using Arduino / Motors, Mechanics, and Power / Re: Help understanding a circuit driving a high power solinoid. on: September 20, 2013, 02:19:10 am
would this help with some ideas

http://ruggedcircuits.com/html/circuit_gallery.html
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