Sunday, April 25, 2010

PCF8574 Lives!

Well after spending a couple hours beating on it, turns out I had done the address jumpers backwards on the board.  So solder the dip switch as normal with "On" at the top, then flip it over to address it.  Here's a quick and dirty addressing table:

PCF8574AT:
A2
A1
A0
Address
0
0
0
56 (38h)
0
0
1
57 (39h)
0
1
0
58 (3Ah)
0
1
1
59 (3Bh)
1
0
0
60 (3Ch)
1
0
1
61 (3Dh)
1
1
0
62 (3Eh)
1
1
1
63 (3Fh)


The soldering is a bit messy as I had removed several components (including the PCF8574) while troubleshooting the addressing problem.  However here are the pics of MoboControl and the board connected to a fan.



Messily soldered board...


...and we have lift off!

Saturday, April 24, 2010

I2C PCF8574 Board and Parts are in!

Just got back from some fishing... and had a nice surprise waiting for me. Both the boards I had ordered and my ULN2803s I had ordered from Hong Kong arrived.  Since my wife badly wants to go to a game tomorrow, she's cooking dinner so I can play. :)

Top of the board


Bottom of the board