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16  Forum 2005-2010 (read only) / Interfacing / Re: Arduino - to - Velleman K8064 DC-Controlled Dimmer on: February 17, 2010, 03:39:30 am
Im just about to do the same thing. in some simulations i made i got best results with 35ohm and 100uF, there i get a almost smooth line 2.396V at 50%pwm, at 100% i get 4.967V and around 20ms for the capacitor to get fully loaded.
I have to say that i didn't put the pwm in the simulator at ideal arduino conditions and probably missed out some important stuff to... :smiley
17  Forum 2005-2010 (read only) / Interfacing / Re: Wire.h and timer interrupts on: February 08, 2010, 04:18:16 am
Hi.
I  have the same problem, want to read from I2C inside an ISR. I found out that Wire use interrupts and inside an ISR interrupts are disabled.
Would be nice to find a solution to this but my knowledge in this subject is not so great  :-/
18  Forum 2005-2010 (read only) / Interfacing / Re: Arduino with 12 servos on: September 01, 2009, 12:48:06 am
Hola Aniss.
check out the RC market. They got a thing called BEC.
i got Castlecreations BEC it can be driven from 5v to 25v and at 12V it has a peak at 7A, with output voltage from 4.8V to 9V. so if u want 6V and 5A on sec side u need 12V and 2.5A + some lost, on prime side.
Maybe not the thing your looking for... its early in the morning and i wanted to write something  ;D
19  Forum 2005-2010 (read only) / Interfacing / Re: Arduino with 12 servos on: August 31, 2009, 04:57:43 am
@mem
aaha ok, cool!
20  Forum 2005-2010 (read only) / Interfacing / Re: Arduino with 12 servos on: August 31, 2009, 01:57:28 am
i probably missing something now, but the Duemilanove only have 6 PWM = controlling 6 servos.
but as i said, i probably missed something out :smiley
21  Forum 2005-2010 (read only) / Interfacing / Re: Lithium for Arduino Pro 5v on: August 31, 2009, 02:24:18 am
NP  smiley-wink
22  Forum 2005-2010 (read only) / Interfacing / Re: Lithium for Arduino Pro 5v on: August 31, 2009, 01:28:33 am
Morning!
That lipo has terrible continuous discharge rate, ONLY 2C, really bad for that price. it means u should never pull more than 4A of current from it. But u maybe won't do that any way^^

These zippy lipos holds a nice quality/price and they have them from 1 cell to 10 cells (3.7V to 37V) and from 15C to 40C. The formula for calculating C is "C * mAh = A".

but to answer your question, the manual says "Input Voltage      3.35 -12 V (3.3V versions) or 5 - 12 V (5V versions)" so u should use a 2 or 3 Cell lipo(7.4V or 11.1V).
also u need to know that a lipo if handled wrong can bust into flames. so read about them and get an descent lipo charger!
23  Forum 2005-2010 (read only) / Interfacing / Re: a warning about Lipos on: August 31, 2009, 01:40:41 am
Yes capt.tagon! That was my point. people have lost there homes because of bad handling of lipos. a proper charger is only one step from being safe. A lipo safe bag is another and never leaving a charging battery unattended is also important.
Lipos are sensitive to overcharging, so if the charger is bad it maybe stops at 4.25 per cell, and that could be enough to make it burn.

keep it safe kids  8-)
24  Forum 2005-2010 (read only) / Interfacing / Re: a warning about Lipos on: August 30, 2009, 01:21:24 pm
Quote
3.7 volts is the nominal voltage of a LiPo cell, 3.0 volts is the usual minimum recommended voltage.

Yes its true, but if u keep in 4.2V to 3.7V the battery will have a much longer life. and dropping under 3V is really bad for the battery and could result in swollen cells.
25  Forum 2005-2010 (read only) / Interfacing / Re: a warning about Lipos on: August 30, 2009, 12:49:52 pm
Here u can see what's could happen if mistreated

26  Forum 2005-2010 (read only) / Interfacing / a warning about Lipos on: August 30, 2009, 12:49:09 pm
I see some people here are using lipos, so I thought I should share my knowledge about these batteries.
 
Lipos could be dangerous if treated wrong. Lipos should newer get over 4.2V per cell and never go under 3.7V. you should always keep them in a fire proof place, there is special lipo bags. Even with the new more stable formula that's out now u should be careful.

And also i recommend to put some money in a nice lipo charger it prolongs the battery life alot, i have a iCharger 106B-plus and are very pleased with it, it's for 1 to 6 cell lipos with a heat protection. and it can charge the new 5C 3cells 2.2Ah easily 5C*2.2Ah=11A*12=132W  smiley-razz should charge and balance in 15-20 min.
Maybe little overkill  ;D

Respect your lipos there is alot of energy stored in those.
27  Forum 2005-2010 (read only) / Exhibition / Re: GSM Shield for Arduino on: September 17, 2009, 12:29:47 am
The nice thing here is u get a fully functional library with HWs shield, u don't get that with Libeliums shield,,, nice work!
28  Forum 2005-2010 (read only) / News / Re: Arduino PID Library on: February 22, 2010, 02:20:11 pm
ok nice. I had some ideas that master needed feedback from slave.
29  Forum 2005-2010 (read only) / News / Re: Arduino PID Library on: February 18, 2010, 03:13:49 am
oh! and i wanna ad one more thing to my wish list, Master/Slave config for cascade regulation. smiley-grin
30  Forum 2005-2010 (read only) / News / Re: Arduino PID Library on: February 05, 2010, 03:02:01 am
Thanx for an splendid lib, just the interrupt part missing for me to be 100% satisfied  8-) and maybe a Tracking value/Tracking active.

By the way PV is often referred as "Process Value" in engineering terms  :smiley
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