Circuit Design Question

[MobileMe]

I'm redesigning my setup for my webcontrol board and I could use some advise on just how it should be build. I purchased a 8 channel relay board and a blank circuit board to build a seperate 5 volt power source. The power supply would provide power to the relay board and the sensors.



Forgive the crude drawing, I don't draw them out much. The basic idea is to get everything that needs 5 volt power off the board itself and onto a seperate source. I'm hoping that will reduce the overall stress on the board to prevent power related issues.

I do have a number of sensors and I plan to add more later on. I know I should have a 5 volt regulator and a capacitor in this design. Is this the right way and/or design to go with?

Thanks,
Mike

 

[CAI_Support]

If you are off grid, you may consider using this DC-DC converter instead of regulator to save some battery:
http://www.ebay.com/itm/300819309722

 

[MobileMe]

If you are off grid, you may consider using this DC-DC converter instead of regulator to save some battery:
http://www.ebay.com/itm/300819309722

No, I'm not off grid but if I ever get that far that would be a good idea. How is my design? Do I need to add anything else to it?

 

[BraveSirRobbin]

Not really sure what you are trying to do. Are you trying to provide a separate 5volt DC supply? Where are you getting the original 5 volt source from? Are you 'regulating' the output to five volts also (not possible as you would need more than five volts on the input).

Also, you don't want to have that capacitor 'in-line' as shown. I think you would want it to ground for filtering (was that your intent?).

Really need more info including current draws desired, input contacts (POS and NEG) and output signals and grounds.

 

[MobileMe]

Not really sure what you are trying to do. Are you trying to provide a separate 5volt DC supply? Where are you getting the original 5 volt source from? Are you 'regulating' the output to five volts also (not possible as you would need more than five volts on the input).
Also, you don't want to have that capacitor 'in-line' as shown. I think you would want it to ground for filtering (was that your intent?).
Really need more info including current draws desired, input contacts (POS and NEG) and output signals and grounds.

Yes, my intention was to provide a separate 5v source to take the strain off the board. I have a lot of sensors and I plan to add more, so I think it's a good idea. I was going to use the separate 5v power source to drive the relay board and the sensors then feed the outputs to the Webcontrol board. I'm still using a 9v power supply to power the board. I just don't want to over drive the Webcontrol board to the point of problems. As of right now, if I add another sensor, the board reboots frequently.

I would love to provide drawings and schematics, but that would take me a very long time. I just moved into a new house and I'm doing a lot of remodeling so time is an issue. I most certainly want to diagram everything out eventually, but I've had to do most of this stuff on the fly.

I just wanted to make sure I'm not missing something from my design. A regulator to prevent over voltage. A capacitor to keep the voltage from dropping. I plan on adding some diodes to prevent back flow too.

I'm not an electrical engineer, so I just wanted to get some opinions on this.

Thanks,
Mike

 

[CAI_Support]

WebControl 5V regulator has max current 1A, that may require to add heatsink, otherwise, it could overheat. So it is a good idea to have seperate 5V power if you have a lot of 5V load, especially load that is over 200mA or so, like CO sensor or relay board. Adding large capacitor will help eleiminating the noise.