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For a credit card sized computer the raspberry pi has awesome input / output capabilities.
Combined with its low power consumption, low cost and Linux operating system this
makes it ideal for data logging applications. The only thing which lets it down is
the lack of an onboard battery backed up clock, however these can be purchased as
an add on.
I have created a Lazarus unit called pi_ioII which contains simple functions for
controlling the Raspberry pi’s I/O.