--- a/thermferm/devices.h	Thu Aug 20 21:14:44 2015 +0200
+++ b/thermferm/devices.h	Tue Sep 15 14:44:21 2015 +0200
@@ -3,6 +3,7 @@
 
 
 int device_out(char *, int);
+int device_in(char *, int *);
 int devices_detect(void);
 
 #ifdef HAVE_WIRINGPI_H