Looking at this example, looks like the functionality is built in.

The thing I'm unsure about is it says this can be done with or without a time module...

So what's the purpose of the time module? Is that only for non-internet connected projects?

How can I use the time with the above example?

Can I, for example, "get" the time once a day at say 1500, and then have actions configured for 1800, 1900, 2000 and so on?

I'm a little unsure how useful the above example is.

Hehe, I know I can’t just ask “the internet” what the time is :-)
I can’t even do that from my computer!

But I could poll an NTP server, couldn’t I? Or do as you suggest and use GET on a willing server.

I need the time because I want my arduino project to know what time it is and I don’t want to have to update it when the clocks go forward and back!

So what do you think?

Thanks for your help.

Hi,

If I have an ethernet shield for my arduino does that mean I don't need to bother with a time module for my project because I can poll the time from the internet?

Or does it mean that I don't nee to bother with a radio module but I very much will still need a RTC module because whilst I can update the time from the interwebs I'll still need a way to keep track of it?

Thanks

I've been having a think. Can someone confirm that using a SPDT relay can be used like a push to break push button, only instead of pushing a button you apply current?

The circuit is closed and working. Current is applied and the relay breaks the circuit because there's nothing connected to the other pins?

Of course. Thank you.

Thanks. This is to switch the bell on an old fashioned GPO telephone so I hope it rings based on the ring signal on the bell wire.

Is the advantage to using a SPDT that the circuit would be wired NO and then when power was sent from an Arduino pin the circuit would break?

Thanks

Sorry – should have been clearer. This is part of a wider Arduino system. Otherwise you’re quite right that there’s no advantage to using an Arduino. ;-)
I have posted about it in project guidance, but I was specifically wanting feedback about the relay.
Maybe if I use a 5v 4 pole relay instead of a 12v one I will encounter less difficulty?

Thanks

Hi,

I am looking at switching a UK phone extension.

Before anyone goes mad at interfering with the PSTN, that's not what I'm doing. I'm merely turning on and off the bell wire of an extension AFTER the master socket.

Currently, I do this with a 12v DC RA4-12WM-K and a wall wart power supply on a timer, but it's ocurred to me that given I only need to switch one wire I could probably do this better with just the switching power of an Arduino pin.

Does anyone have any experiences to add?

Otherwise, any thoughts on how I can power this 12v DC relay from the Arduino?

THANKS