The day after I wrote this distribution, Gordon (creator of wiringPi) updated his software, so I've updated WiringPi::API and RPi::WiringPi to support the BMP180 directly, as well as the ability to use the 74HC595 shift registers (four in series for a total of 32 extra output pins using only three GPIO pins).

I have a bunch more stuff to add to those modules, and I'm very close to including a DAC, digital POTs and a couple of others. After that's all done, I'm going to do a full-blown blog post series on using Perl on the RasPi.

I also added in a new wiringPiVersion() function in wiringPi itself, and sent Gordon the patch. He's replied and stated he'll incorporate something similar. The reasoning behind my patch was so that the WiringPi::API core distribution can check to see what version of wiringPi we're on, to ensure that installation goes smoothly, else report to the user that there's a version mismatch (reported by Joel Berger a couple of days ago).