What is wrong with this schematic for mcp23016-I/SP ?
I had someone develop a schematic for me a wile back.. and well.. i am not going to start..
But, basically I have the board cut, and it doesn't work.
I know my bs2p24 works fine .. and· the only thing the picture below doens't show is the resistors (10k ohm) on the sda/scl line...
I believe my code is right, and I am addressing the mcp currectly.
I just think the schematic is wrong.
I can apply 5volts to the input pins on the uln2803a chip and I will get 12v output from the output side of the uln2803a.
I have 2x of the type setup (so I doubt that I have 2 bad mcp chips).
anyways, does anyone know why this schematic isn't working?
Oh yeah.. and as jumpers"" i am using a 10k resistor
Post Edited (trend) : 11/29/2004 9:20:12 PM GMT
But, basically I have the board cut, and it doesn't work.
I know my bs2p24 works fine .. and· the only thing the picture below doens't show is the resistors (10k ohm) on the sda/scl line...
I believe my code is right, and I am addressing the mcp currectly.
I just think the schematic is wrong.
I can apply 5volts to the input pins on the uln2803a chip and I will get 12v output from the output side of the uln2803a.
I have 2x of the type setup (so I doubt that I have 2 bad mcp chips).
anyways, does anyone know why this schematic isn't working?
Oh yeah.. and as jumpers"" i am using a 10k resistor
Post Edited (trend) : 11/29/2004 9:20:12 PM GMT
Comments
Post Edited (trend) : 11/29/2004 9:20:40 PM GMT
There are 2 resistors/caps (?)(shown by the red arrows)·Not sure what they are.. I am still new to this hole field.. that is why i had someone make a board for me.
Post Edited (trend) : 11/29/2004 9:20:58 PM GMT
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Jon Williams
Applications Engineer, Parallax
Dallas Office
Sid
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Jon Williams
Applications Engineer, Parallax
Dallas Office
I might of just been addressing the mcp wrongly.. because I thought I was using the code you looked over
oh well
thanks! Lee