newbie- timed relay project

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1

Hi, this is my first post here and I am totally new to the arduino world....
my electronics knowledge is average and I highly appreciate your help.

I have available the Arduino Uno, 2 channel 5V relay. Is it possible to achieve the following?

  • Input 1 = 12v DC (as a pulse but will be available for 2 seconds) <<<<>>>> Output = channel 1 relay operates 30 seconds only
  • Input 2 = 12v DC (as a pulse but will be available for 10 seconds) <<<>>> Output = channel 2 relay operates 10 seconds only

NB: note that the two DC inputs will NOT be operating simultaneously........
NB:

Any guidance that can put me through my project is highly appreciated...
thx.ed

2

Is it possible to achieve the following?

Yes
For the 12v inputs you need the move these down to 5v.
Can use optoisolators or transistors or voltage dividers.

3

And don't forget that if that same 12V is supposed to supply the 5V to the coil, you'll need to drop it to 5V for that too, but with a dc-dc voltage converter. Or have you got 5V handy for the coil?

4

By the way, when you say "2 channel relay" do you mean just a standalone relay or a "relay on a board" module with a control input?

If the former, you'll need a transistor to do the switching of the coil 5V with the Arduino i/o to its base. If the latter, you switch the relay with an Arduino i/o pin and the board has electronics to do that.

5

1- no problem in reducing the 12V to 5V as a sensing input for the arduino
2- the relays are relay on a board" module with a control input... thus they can be connected directly to arduino outputs
3- I have no experience with coding languages
.. Is there any available coding example similar to mine so that I can elaborate accordingly? I tried looking here to no avail...
Any help in this respect is highly appreciated. thx in advance

6

I used minibloq application to come out with the following code parameters.... did i do it right? am i on the right track?
D0 & D1 are used to sense the 5V (converted from 12V through a voltage divider using a 2.2k and a 1k resistors would keep my input voltage under 5 for all the way to 16v source)
D14 & D15 are the digital outputs that should trigger the relays 1 & 2 accordingly for the below specified values in milli-seconds. right?

#include <mbq.h>
#include <PingIRReceiver.h>

void setup()
{
initBoard();
while(DigitalRead(D0))
{
DigitalWrite(D14, true);
delay(10000);
}
while(DigitalRead(D1))
{
DigitalWrite(D15,
delay(30000);
}
}

void loop()
{
}

7

D0 and D1 are used for Arduino communications so try to avoid using them if you can.
Why don't you just use the Arduino IDE for witing your code?

8

noted for D0 & D1.
working with minibloq is a fully GUI application for writing codes in comparison with the Arduino IDE...

9

working with minibloq is a fully GUI application for writing codes in comparison with the Arduino IDE...

I know.
I was just suggesting you should use the IDE.