The Raspberry PI or R-pi from http://www.raspberrypi.org/ is well known these days.
It is not an accident that I have one, I have been doing Linux stuff since 1991, and professionally since 1996 I can not skip over these developments, have to keep up with the new kids. :-)
Times have changed, hardware has become very affordable, everybody knows the Arduino, Raspberry Pi and Beagle-Bone-Black (BBB). Not everybody knows the stuff that http://www.acmesystems.it/ aka Acme-Systems and https://github.com/OLIMEX/OLINUXINO aka Olimex make, so I will endorse them here.
Since I am an engineer I expect to connect switches and relays to the boards and some documentation with products, not so with the "PiFace Digital" board, it comes without serious documentation, not a even the schematic. All links on their blog point nowhere. People asked them many times, yet nowhere is the schematic to be found.
I finally found some info after hours of google-work, someone made a copy!
https://github.com/Elektordi/pi-accesscontrol/tree/master/doc
So I quickly copied that and put it here for you to find, that is the reason you are here right?
Here is a picture.
Have fun with it.
I will report adventures with the board when I get time.
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Update: this schematic is for an old board, look at JP3, where does it go? Are the INTA INTB not connected to a GPIO pin, what is that?, do we have to poll the 16-bit I/O Port Expander (mcp23s17) to see if there is a pin toggled. If that is the case this board is an example of how NOT to design an IO board.
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Update 23 aug 2013
I sent a mail to pi AT cs.man.ac.uk
And I got a prompt reply:
Hi Edwin,
===
So things are not as bad as they seemed. I will update the schematic picture above to reflect the new information today.
After measuring the connections, I found that INTB is connected to GPIO25 (pin 22 on the connector, in the schematic it is marked GPIO6) but INTA is just not connected.
It is not an accident that I have one, I have been doing Linux stuff since 1991, and professionally since 1996 I can not skip over these developments, have to keep up with the new kids. :-)
Times have changed, hardware has become very affordable, everybody knows the Arduino, Raspberry Pi and Beagle-Bone-Black (BBB). Not everybody knows the stuff that http://www.acmesystems.it/ aka Acme-Systems and https://github.com/OLIMEX/OLINUXINO aka Olimex make, so I will endorse them here.
I finally found some info after hours of google-work, someone made a copy!
https://github.com/Elektordi/pi-accesscontrol/tree/master/doc
So I quickly copied that and put it here for you to find, that is the reason you are here right?
Here is a picture.
 |
| Pi Face digital schematic |
Have fun with it.
I will report adventures with the board when I get time.
====
Update: this schematic is for an old board, look at JP3, where does it go? Are the INTA INTB not connected to a GPIO pin, what is that?, do we have to poll the 16-bit I/O Port Expander (mcp23s17) to see if there is a pin toggled. If that is the case this board is an example of how NOT to design an IO board.
====
Update 23 aug 2013
I sent a mail to pi AT cs.man.ac.uk
And I got a prompt reply:
Hi Edwin,
Unfortunately the schematics are not available however if you're looking to use interrupts then the new software supports them.
You can find the most up-to-date Python libraries for PiFace Digital here: https://github.com/
And here is some documentation on how to use interrupts: http://piface.
The datasheet for the MCP23S17: http://ww1.
Pins INTA (20) and INTB (19) are both wired to GPIO pin 25.
Hope that helps!
Tom
===
So things are not as bad as they seemed. I will update the schematic picture above to reflect the new information today.
After measuring the connections, I found that INTB is connected to GPIO25 (pin 22 on the connector, in the schematic it is marked GPIO6) but INTA is just not connected.
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