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Author Topic: GPIO and Breakout boards  (Read 5501 times)

NewIT_Jason

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GPIO and Breakout boards
« on: 06 February 2013, 01:05:27 pm »

We have now got a section for the GPIO bits in the shop, we will be adding more items each week as the deliveries come in.  Any surgestions for items you would like to see us selling are always welcome  ;D
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apemberton

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Re: GPIO and Breakout boards
« Reply #1 on: 21 February 2013, 11:09:14 pm »

One-Wire adaptor boards from Sheepwalk Electronics? http://sheepwalkelectronics.co.uk/index.shtml I am using a couple with temperatue sensors as well as functionally similar homebrewed i2c DS2482/DS18S20 sensors around the house.
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Tony Pemberton

apemberton

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Re: GPIO and Breakout boards
« Reply #2 on: 09 March 2013, 03:43:22 pm »

I see that Elektor magazine has prototyping boards available. Not in the shop i know but....

http://www.elektor.com/products/pcbs/12xxxx-x/120483-1-raspberry-pi-prototyping-board.2415536.lynkx

The other thing I would love to see, though I am not sure if it is possible, is a means of stacking the Rpi GPIO connector so that different boards can be layered. For example, the Piface doesn't seem to use i2c pins yet I want to use some i2c devices.

And another thing, it would be nice, though not particularly cost effective for manufacturers, is a case capable of accommodating stacked expansion boards. Suggestions would be welcome though.
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Tony Pemberton

rfrazier

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Re: GPIO and Breakout boards
« Reply #3 on: 11 March 2013, 12:07:30 am »

I'm not using a breakout board, but I have found having the GPIO pins available really useful.  I hooked up a Raspberry to a Trimble Resolution T GPS timing receiver to make a dedicated NTP server. I use the simple UART (pins 14 and 15) in the GPIO section for serial (crummy timekeeping), and pin 18 for the PPS (pulse per second) signal (great time keeping).  The Raspberry's system clock doesn't have the very best precision (954 nanoseconds), but I've been able to hit that limit with an average of less than 500 nanoseconds (0.0000005 seconds) offset from UTC.  Here's an example of the offset and jitter taken from peerstats. 


Code: [Select]
offset      jitter
 0.000000030 0.000000954
 0.000000067 0.000000954
-0.000000234 0.000000954
-0.000000041 0.000000954
 0.000000312 0.000000954
-0.000000291 0.000000954
 0.000000281 0.000000954
-0.000000255 0.000000954
 0.000000049 0.000000954
 0.000000030 0.000000954

Best wishes,
Bob
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