Connection problem in interfacing with ULN2003a

[rizzy_dascal]

Hi,

Could somebody please look at the enclosed picture and see if they can explain the connection problem for me please.

thanks in advance
Rizzy

 

[Jestin_cubetech]

Re: Interfacing with ULN2003a

ULN2003A Interface

 

[ud23]

Re: Interfacing with ULN2003a

your relay and uln2003 com is +24v supply and your +24v and pic+5v supply ground you have to make them common for your circuit working.

 

[adeel abid]

Re: Interfacing with ULN2003a

Both PIC and ULN should have the same ground. it does not matter whether gnd is of 5v or 24v.

- - - Updated - - -

Both PIC and ULN should have the same ground. it does not matter whether gnd is of 5v or 24v.

 

[rizzy_dascal]

Re: Interfacing with ULN2003a

Thank you gentlemen, I sort of guessed that this might be the case, the fact that isis pro and other apps hide the ground does not
really help matters...

Thanks again
Acestu