I want to modify the neat little PFC8574 mini board I bought from futurlec.com by adding a RJ12 input socket.
I have prepared a diagram showing where I think the wires should go but would appreciate it if someone could look at it and advise of any errors before I start work.
The socket will be placed on top of the board and all the wiring carried out underneath to leave the original input arrangements untouched. The board has built-in pullups (jumper selectable)but they are only 10k so I will not be using these.
Futurlec PFC8574 mini board modification
Futurlec PFC8574 mini board modification
A sophistical rhetorician, inebriated with the exuberance of his own verbosity, and gifted with an egotistical imagination that can at all times command an interminable and inconsistent series of arguments to malign an opponent and to glorify himself.
Re: Futurlec PFC8574 mini board modification
I didn't double check the wiring on the PCF8574 board against Futurlec datasheets, but it all looks fine to me. If you don't have exactly 82K resistors, I've had success with everything from 10K to 100K and Matt has used up to 470K on short data buses. It is preferable to stay between ~30K to ~100K though.
One King to rule them all, One King to find them,
One King to bring them all and in the darkness bind them
On Earth where Shadows lie.
One King to bring them all and in the darkness bind them
On Earth where Shadows lie.
Re: Futurlec PFC8574 mini board modification
Thank you very much for such a fast reply. I have already bought a pack of the recommended resistors so I can get started straight away.
A sophistical rhetorician, inebriated with the exuberance of his own verbosity, and gifted with an egotistical imagination that can at all times command an interminable and inconsistent series of arguments to malign an opponent and to glorify himself.
Re: Futurlec PFC8574 mini board modification
Glad to help. It's always fun to see other people create custom hardware, especially when they come up with the same old thing, but put together in a different way. The PCF8574 is a pretty versatile chip, especially when you use your imagination. Stay tuned for a project of mine that uses the 8574 in a slightly stranger-than-normal manner.
One King to rule them all, One King to find them,
One King to bring them all and in the darkness bind them
On Earth where Shadows lie.
One King to bring them all and in the darkness bind them
On Earth where Shadows lie.
Re: Futurlec PFC8574 mini board modification
A very small hair brush for a pet hamster? You'll have to hot glue a small handle to the DIP package.Stay tuned for a project of mine that uses the 8574 in a slightly stranger-than-normal manner.
- Xander
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| RobotC 3rd Party Driver Suite: (http://rdpartyrobotcdr.sourceforge.net)
| Some people, when confronted with a problem, think, "I know, I'll use threads,"
| and then two they hav erpoblesms. (@nedbat)
Re: Futurlec PFC8574 mini board modification
Haha, very funny. The only pets I have are some (usually) 20+ birds and they take care of combing themselves.mightor wrote:A very small hair brush for a pet hamster? You'll have to hot glue a small handle to the DIP package.
One King to rule them all, One King to find them,
One King to bring them all and in the darkness bind them
On Earth where Shadows lie.
One King to bring them all and in the darkness bind them
On Earth where Shadows lie.
Re: Futurlec PFC8574 mini board modification
Now that is a scene I would love to see!
A sophistical rhetorician, inebriated with the exuberance of his own verbosity, and gifted with an egotistical imagination that can at all times command an interminable and inconsistent series of arguments to malign an opponent and to glorify himself.
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