Yes, Nick tends to knee-jerk migrate any post that merely mentions Raspberry Pi or Arduino, without considering whether the question is really appropriate for the destination site.
I've undeleted, reopened and edited your original questionyour original question, and added a comment. Note that it is still borderline off-topic, since it's really about the use of existing devices rather than electronics design. But I'm going to err on the side of calling it a system-level design question. Let's try to keep it from crossing the line.