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jbeale
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Re: simple 16 signal GPIO I2C board

Sun Apr 15, 2012 6:03 am

This I2C based I/O expander board looks quite useful, I think I might like to get one for use with other devices, even before my RiPi arrives (which may be months, as I haven't yet even been able to order it).  Will look forward to seeing your board available for sale!

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Frank Buss
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Re: simple 16 signal GPIO I2C board

Thu Apr 19, 2012 8:50 am

You can buy it now!

http://shop.trenz-electronic.d.....anguage=en

And I've tried to create a datasheet for it:

http://www.frank-buss.de/io-ex.....pander.pdf

Needs still a bit of work, this is my first electronics parts datasheet

If you don't have a Raspberry Pi, I've tested it with the Arduino compatible chipKIT Uno32, source code for it on my webpage http://www.frank-buss.de/io-ex.....index.html . In the "Digilent Cable & Connectors" section of the shop you can get female-female jumper cables to connect it, and pin headers, but you can also just solder normal cables to it.

hamjudo
Posts: 59
Joined: Thu Nov 03, 2011 3:25 pm

Re: simple 16 signal GPIO I2C board

Thu Apr 19, 2012 11:46 am

Can you add other shipping options for shipping to the US?

For 1 or 2 boards, the online store tells me that the cheapest shipping option, UPS Saver, is 55.99EUR.

The datasheet shows the "Condition on delivery" as with some pins soldered on. If you leave off those pins, could they be shipped more economically in an envelope instead of in a package?

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Frank Buss
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Re: simple 16 signal GPIO I2C board

Thu Apr 19, 2012 12:17 pm

hamjudo said:


Can you add other shipping options for shipping to the US?

For 1 or 2 boards, the online store tells me that the cheapest shipping option, UPS Saver, is 55.99EUR.

The datasheet shows the "Condition on delivery" as with some pins soldered on. If you leave off those pins, could they be shipped more economically in an envelope instead of in a package?


I'ts not my shop, and I'm glad that I don't need to do all the shipping work but I've contacted the shop owner and he says, they'll ship it cheaper on request, if it fits in a envelope (should be possible with 2 boards). It is more work for them, so it is not a standard shipping option, but you can use the contact form on their website to ask for. The advantage of UPS is that you get it in 2 days, less expensive shipping methods may need up to 2 weeks.

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Frank Buss
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Re: simple 16 signal GPIO I2C board

Thu Apr 19, 2012 2:23 pm

pin headers are now included in the price

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Frank Buss
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Re: simple 16 signal GPIO I2C board

Wed May 09, 2012 3:00 am

Got a Raspberry Pi (couldn't wait, so I bought it from eBay) and it works with my IO Expander. Just attach 4 jumper wires and you have 16 protected GPIOs:



Discussion about my modification of the Linux driver for I2C support: http://www.raspberrypi.org/for.....-io/page-3

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Frank Buss
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Re: simple 16 signal GPIO I2C board

Tue Aug 14, 2012 2:41 pm

Just a link to my latest post, if you are watching this thread: now the IO Expander works for Raspbian, too (and 1-wire, SPI and I2C in general) : http://www.raspberrypi.org/phpBB3/viewt ... 99#p149799

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