installation help

[seracing]

I run a production facility that has an overhead audio system.  I want to use the night ringer from the audio system, for an alarm to send my employees to break.  I have the WC set up and a vb app running that triggers the outputs at a specific time. It is powered by a 9V power supply.   The audio system night ringer is triggered by a contact closure.  My plan was to use the one of the 5v relay board as the contact closure and the WC outputs to pull in the relays.  Can I power the relay board from the WC Humidity Sensor?  I will be having a max of 2 outputs going high for a 5 second duration.  Is there another way for the WC to act as a contact closure without using a relay board?  
 
thanks,
Scott

 

[CAI_Support]

Hi Scott,
 
It depends on the relay coil rating. We don't recommend to have large current load on the 5V power, since that could cause regulator overload.  Having a separate power for relay board can make the setup more reliable.  Relay contact is probably a best choice, since it does not introduce any additional audio noise.  If you have a small reed relay, that is probably okay to be powered by the power from the board.

 

[az1324]

If it is a signal type contact closure you can probably use either a darlington transistor with common ground or an optoisolator.  Just measure the voltage and current of the contact closure first.

 

[CAI_Support]

If it is a signal type contact closure you can probably use either a darlington transistor with common ground or an optoisolator.  Just measure the voltage and current of the contact closure first.

Good idea!  using optcoupler will have no need for relay or extra power supply.

 

[seracing]

Thanks for the help!