Hi all
No doubt I'll be posting in here regularly, I hope you don't mind!! I'm new to Arduino, hell, I'm new to electronics in general, but I have an ever growing list of ideas I'm desperate to attempt to make and I want to try and get through them all.
I just wanted to ask first, how possible would it be for me to make a small circuit which, when activated by a SPDT switch, would first supply power from 2x 1.5v batteries, followed by the activation of 5 relays? Similarly the reverse, by switching off the SPDT switch it would first flick the 5 relays to opposite poles, then cut the 3v power.
Is this doable?
Many thanks
Chris
What do you want to power from the 3V? Are you planning to use an Arduino?
supply power from 2x 1.5v batteries
Supply power to what? Arduino's can easily drive relays and MOSFET transistors depending on the voltage and current requirements. Perhaps if you share a bit more of what you are really trying to do.
Hi,
I think all the OP wants to do is use a switch and 3V of batteries to switch 5 relays ON and OFF, and hence with double pole switching, switch common from one pole to the other.
What you don't realize is if your relay is a double pole type, with the relay OFF one contact is connected to common terminal, with relay ON, the other contact is connected to common.
So all you need is to turn power on and off with your switch.
Your relay will need to have a coil voltage rating for your 3V battery supply.
What is your application?
Tom... 
Hi all
Many thanks for replying. As I say I'm quite new to all this and I know I must sound stupid if I don't word things correctly and for that I apologise.
Believe it or not the relays themselves do not comprise of the main project's function, what I'm actually trying to do is make a form of "bypass" circuit within the design. The theoretical concept I'm working on is this;
I want to make a system of relay-like pathways that can be remotely reconfigured on the fly over bluetooth, and I'm trying to make the entire device (this device, there would of course have to be two if bluetooth is involved) literally as small as possible as it's paramount that the end product ends up no bigger than a 9v battery in total size. I would expect my first prototype to end up bigger being the nature of what's available, but eventually when the concept is sound enough for a working prototype, I hope to approach a PCB manufacturer and get a final build made for mass production that is small enough.
Basically, I'm not content with an Electric Guitar's standard pickup switching system and I want to create something that's far more suitable to my needs. So using a series of CMOS switches controlled by an Arduino nano that receives instructions via bluetooth, theoretically I should be able to reconfigure Electric Guitar Pickups as I see fit. My initial question to you all was based on my need for a "circuit bypass", in case I want/need to revert to the traditional method of pickup control, and by flicking a switch, the latching relays would put the pickups back to their original circuit setup and latch, before cutting power to the board. Similarly, activating the system would be by method of flicking the switch to power the board and trigger the relays in sending those pickups into my system.
I'm aware that as a newbie to Arduino and electronics I should probably be focusing on how to make an LED blink or something, but this is an idea that's been eating away at me for years and I'm desperate to build it! So thank you all for any help you provide
TomGeorge:
Hi,
I think all the OP wants to do is use a switch and 3V of batteries to switch 5 relays ON and OFF, and hence with double pole switching, switch common from one pole to the other.
What you don't realize is if your relay is a double pole type, with the relay OFF one contact is connected to common terminal, with relay ON, the other contact is connected to common.
So all you need is to turn power on and off with your switch.
Your relay will need to have a coil voltage rating for your 3V battery supply.
What is your application?
Tom...
Hi Tom, many thanks for this! So are you saying that if I use NO/NC relays, there's no need for Arduino to manage them? Just wire the relays in series?
