Arduino Forum

Using Arduino => General Electronics => Topic started by: wrdArduino on Sep 15, 2015, 07:15 am

Title: Why this shematic work bad? Please help!
Post by: wrdArduino on Sep 15, 2015, 07:15 am
Good morning! Have a trouble, this shematic is true? :)

Have some problem with pin 12(maybe?)
Arduino usb always frozen(my code in forum programming)

HELP,HELP,HELP!!!

(http://s7.hostingkartinok.com/uploads/thumbs/2015/09/7287ffcb66bbe20dfdc770cf1022a1c8.png) (http://hostingkartinok.com/show-image.php?id=7287ffcb66bbe20dfdc770cf1022a1c8)

I have no options...
Title: Re: Why this shematic work bad? Please help!
Post by: Grumpy_Mike on Sep 15, 2015, 07:30 am
The diode is in the wrong place, it should be across the coil not in seriese with it.
That is probably causing the freezing.

That diagram is very poor. First it is on its side which makes it difficult to read in a mobile device because the device keeps putting the picture the "right" way up.
What size is that resistor?
Title: Re: Why this shematic work bad? Please help!
Post by: wrdArduino on Sep 15, 2015, 08:31 am
it should be across the coil not in seriese with it. ???
resistor is not lit!
Title: Re: Why this shematic work bad? Please help!
Post by: Watcher on Sep 15, 2015, 09:33 am
Is pin2 controlling the relay coil? Why is the third pin (of the coil??) connected to 3.3v?
Arduino cannot directly drive relay coil anyway.
The diagram is not clear at all.

What are you trying to do??
Title: Re: Why this shematic work bad? Please help!
Post by: wrdArduino on Sep 15, 2015, 12:43 pm
Pin 2 show open\close state of the device as a whole.

Adapter 12v 5A send impuls to coil across relay throw diod by 12 pin (open\close relay)!

I am not electronics!
Title: Re: Why this shematic work bad? Please help!
Post by: Grumpy_Mike on Sep 15, 2015, 01:04 pm
it should be across the coil not in seriese with it. ???
resistor is not lit!
Let us hope the resistor is not lit.

1) You need a diode across that induction coil not in series with it.
2) You need a transistor to drive the relay coil.
3) You need a diode across the relay coil.

4) You need a better translator that then one you have, your replies are barely comprehensible.
Title: Re: Why this shematic work bad? Please help!
Post by: wrdArduino on Sep 16, 2015, 01:29 pm
Thanks to all, problem solved!
Shematic good, coding simple!!! :) from SerialEvent i removed DELAY and changed code!

Thanks to "experts" for help !

5) Grumpy_Mike напиши свой ответ на русском!
Title: Re: Why this shematic work bad? Please help!
Post by: Grumpy_Mike on Sep 16, 2015, 02:33 pm
Quote
Shematic good,
нет

Поэтому задать вопрос , если вы не хотите , чтобы узнать,
Title: Re: Why this shematic work bad? Please help!
Post by: raschemmel on Sep 16, 2015, 11:25 pm
Quote
5) Grumpy_Mike  напиши свой ответ на русском!
Quote
5) Grumpy_Mike  Write your answer in Russian !
Quote
нет

Поэтому задать вопрос , если вы не хотите , чтобы узнать,
Google Translate:
Quote
no

So ask the question if you do not want to know ,
Title: Re: Why this shematic work bad? Please help!
Post by: Grumpy_Mike on Sep 17, 2015, 12:29 am
Yes not quite right was it but you don't know if the word "why" was dropped on the way into Russian or on its return journey.
Title: Re: Why this shematic work bad? Please help!
Post by: ApexM0Eng on Sep 17, 2015, 12:51 am
Google translate feedback loops are pretty brutal.
Title: Re: Why this shematic work bad? Please help!
Post by: wrdArduino on Sep 18, 2015, 07:09 am
Thanks for help!

So it is heard your answer as -- :) brutal in my language!!!

Title: Re: Why this shematic work bad? Please help!
Post by: raschemmel on Sep 18, 2015, 09:26 am
In view of :
"I'm not electronics !"
is there really any point in telling the OP that the reason the diode should be in parallel with the coil instead of in series is that :
A- the diode drops 0.7 V
B- the diode is a "flyback diode" intenddd to shunt " back EMF"
C- the reason for using a transistor to drive the relay is to provide isolation between the arduino relay driving pin and the relay power.

?