joining 0V lines from two power supplies

[ingram010]

Hi all

Can someone please take a look at the attached diagram and tell me if it is ok to connect the 0Vdc lines from two separate power supplies, will this cause any problems with the microchip circuit or the arduino circuit?

the operation of the circuit is as follows:

The old microchip circuit sends a digital output signal to the arduino, the arduino then reads the value from the current sensor, if the value is above a pre-set value then the arduino energizes the relay on the shield which in turn energizes a larger relay(in blue), thats it.

Please excuse my child like diagram!

Kindest regards

John

 

[betwixt]

Should be OK.

The only thing that worries me is your Hall Effect sensor, is it measuring magnetic field around the 0V wire or is the dotted line just a way of joining the connection on the schematic? As long as the two PSUs either have isolated outputs or their grounds are joined elsewhere it should work fine though.

Brian.

 

[ingram010]

Should be OK.

The only thing that worries me is your Hall Effect sensor, is it measuring magnetic field around the 0V wire or is the dotted line just a way of joining the connection on the schematic? As long as the two PSUs either have isolated outputs or their grounds are joined elsewhere it should work fine though.

Brian.

Thanks Brian

Yes the dotted line is just connecting the the Ov lines.

Time to plug it all in!

 

[betwixt]

Give it a go!

I'm far enough away to avoid any blast damage :lol: I'll keep an eye on the southern sky though!

Brian

 

[ingram010]

Give it a go!

I'm far enough away to avoid any blast damage :lol: I'll keep an eye on the southern sky though!

Brian

It works like a dream, thanks again!