On Fri, 29 Mar 2019 17:04:19 +0000
Rob Morley  wrote:

>On Fri, 29 Mar 2019 18:48:20 +0200
>Tauno Voipio  wrote:
>
>> Hundreds of inputs may mean that Pi is simply
>> too small alone to get them in. The data may be
>> coming farther than a couple of inches from the
>> processor, and it needs precautions in order
>> not to blow up the whole thing on electrical
>> transients.
>>
>Use sacrificial Arduinos to handle the inputs and deliver nice clean
>logic to the Pi.   :-)
>
An arduino mega can give you over 50 inputs, each requiring nothing more than
a series 4k7 resistor and a shunt 10n cap to be pretty much bomb proof. Pack it
together and spit it out as serial @ 115200 baud.

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W J G

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