Can I jump 3.3v pin directly to input pin?

[David Messem]

Hi IOIO users!

Apologies if this is a silly question, I am an electronics noob, and I am worried about damaging the board.

Can I jump a 3.3v pin directly to an input pin?

I want to send 3.3v to a relay, then send back the 3.3v into a pin when the relay is triggered.

Thanks!

[Ytai Ben-Tsvi]

Yeah sure, all pins can handle 0..3.3V (and some up to 5V).

What you're describing sounds a bit strange, but maybe only because I don't fully understand what you're trying to do.

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[David Messem]

I have another device with a relay, and I want to use the IOIO to sense the state of that relay.

I thought I would connect the input of the relay to the 3.3v pin, and connect the output of the relay to a GPIO pin.

I this way, the GPIO pin will read 0v when the relay is open, and 3.3v when the relay is closed.

On Tuesday, November 15, 2016 at 10:16:51 PM UTC+2, Ytai wrote:

Yeah sure, all pins can handle 0..3.3V (and some up to 5V).

What you're describing sounds a bit strange, but maybe only because I don't fully understand what you're trying to do.

On Mon, Nov 14, 2016 at 10:05 PM, David Messem <david....@gmail.com> wrote:

Hi IOIO users!

Apologies if this is a silly question, I am an electronics noob, and I am worried about damaging the board.

Can I jump a 3.3v pin directly to an input pin?

I want to send 3.3v to a relay, then send back the 3.3v into a pin when the relay is triggered.

Thanks!

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To unsubscribe from this group and stop receiving emails from it, send an email to ioio-users+...@googlegroups.com.

[Ytai Ben-Tsvi]

Yes, that should work fine, as long as you remember to use a pull down resistor on the pin (either internal or external) to assert a valid 'low' condition when the relay is open.
Another way to accomplish the same thing, which is probably what I would do, is to have the relay pull to GND while using a pull UP on the pin. It doesn't really matter.

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