Am I going a long the right tracks? Anything else I should take into consideration when connecting all this together, any extras needed between the relay and Arduino?
I really don't fancy spending money on stuff I really don't need to spend it on
Am I right in thinking that the Relay I've just provided, requires a 12V voltage to turn the relay on and off, so the Arduino won't be able to switch it on and off? or am I right in thinking that this Relay will accept a 12V input (I.E the adapter I said above)
xerof,
You won't have to use any resistors as the lock seems to be able to run at both voltages.
I don't know why you choose relays in pairs ... do you need more than one?
Yes, there may be an issue around the current available on an arduino-pin to run the relay. They shouldn't make the advertizing as they do (the 5V relay), unless it would work right away from the arduino though. The alternative is to control a transistor from arduino, and that in turn is connected to the 12V. It's no big deal and it's cheep.
Thanks for the quick response. I ordered the 5V Relay last night. If I'm right, what you are saying is that the Arduino might not have the power to operate the Relay correctly?
I just brought it as a pair just because of the price and wasn't sure if I needed the second one for anything at the time.
xerof:
If I'm right, what you are saying is that the Arduino might not have the power to operate the Relay correctly?
Check the specs for the arduino-pin max current (I think it's around 20 mA [micro?]) and the expected current for the relay (or the wattage = amp*5v if I'm not mistaken)
