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+-*- org -*-
+
+Guile-GPIO provides a convenient Guile interface to the Linux GPIO
+Sysfs API.  It abstracts away all of the details regarding the GPIO
+file system and allows the programmer to focus on writing userspace
+GPIO drivers rather than fiddling with file descriptors.
+
+#+BEGIN_SRC scheme
+  (use-modules (gpio))
+
+  (with-pins ((pin1 1 #:direction 'in #:edge 'falling)
+              (pin3 3 #:direction 'out))
+    (pin-set! pin3 #t))
+#+END_SRC