I need to know what the NC is on the bottom of the board. I have no clue and I can't seem to find a data sheet. The wiki on the website doesn't seem to help either. I would also like to know if it is at all possible to run any additional power into just the relay it's self, without the power going back into the Arduino.
Info: I am using this on a Raspberry Pi but because I am using it how you would use it on the Arduino (I have 2 of them so please don't hate. :P) I came here for help.
NC typically means No Connection, in as not used, not wired to anything on the board, not needed to make the board functional, etc.
You could always use an ohm meter and check between that NC pin and every connection on the board to see if it is indeed a No Connection.
My guess is that it stands for No Connection which could mean any number of things depending upon the manufacturer. It's probably not connected to anything, but you should be careful. Can you see the traces on the circuit board and see if any connect to that pin on the connector?
I did use an ohm meter on it and it did not show a resistance so that is why I started to get confused. NC - no/not connected actually does make sense. Do you have any idea as to how I could use the Arduino/Raspberry Pi to trigger the relay on but still have it turn a voltage on or off to power a motor?
I did use an ohm meter on it and it did not show a resistance so that is why I started to get confused. NC - no/not connected actually does make sense. Do you have any idea as to how I could use the Arduino/Raspberry Pi to trigger the relay on but still have it turn a voltage on or off to power a motor?
Well for the an Arduino the setup would be pretty simple. Vcc would wire to the arduino 5V shield pin, GND would wire to an arduino ground pin, SIG would wire to one of the digital pins you desired. Setting the digital pin to output mode and setting HIGH would turn on the relay, while setting the output pin LOW would turn off the relay. Then the green connector terminals would be wired in series with the motor's external power supply positive terminal and one of the motor leads, the other motor lead would wire to the external power supply negative terminal. If the motor runs in the wrong direction then just swap the two wires on the motor's two terminals.
Can't state a thing about Raspberry Pi hook-up and operations.