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40 pin breakout

Thu Oct 29, 2015 4:01 pm

This may appear to be a silly question but can I open up the "blind" hole on an IDE cable and use it as a GPIO extender for the Raspberry Pi?

It is, after all, 40 pins as well.


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Re: 40 pin breakout

Thu Oct 29, 2015 4:06 pm

As long as the cable is straight through and doesn't have any pins crossed over you should be OK.

Pin#20 (if I've counted it right) that's blocked is only a GND pin.
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Re: 40 pin breakout

Thu Oct 29, 2015 7:10 pm

Yes, if it an old-style 40-wire cable. "Newer" IDE/PATA cables used 80-wires to the 40 pin connectors and some of the pins are joined together which can be bad news for a Pi.

I can recognise the two types of cable just by looking at them, but if you aren't sure then just count the first ten wires - if that gets you about a quarter of the way across the cable then it is good. If not, don't use it.

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Re: 40 pin breakout

Fri Oct 30, 2015 5:59 pm

Yes, I've done it to utilize some old IDE cables. It's just a thin layer of plastic over the hole, and the female connector is in there. But as mentioned it has to be a 40 conductor cable, not a 80 conductor.

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