diff --git a/afsk/telem.c b/afsk/telem.c
index c8d8d214..6fc88d43 100644
--- a/afsk/telem.c
+++ b/afsk/telem.c
@@ -240,10 +240,19 @@ int main(int argc, char *argv[]) {
   sensor[PLUS_Y]  = config_sensor("/dev/i2c-1", 0x41, 400);
   sensor[BUS]  	  = config_sensor("/dev/i2c-1", 0x45, 400);
   sensor[BAT]     = config_sensor("/dev/i2c-1", 0x44, 400);
-  sensor[PLUS_Z]  = config_sensor("/dev/i2c-3", 0x40, 400);
-  sensor[MINUS_X] = config_sensor("/dev/i2c-3", 0x41, 400);
-  sensor[MINUS_Y] = config_sensor("/dev/i2c-3", 0x44, 400);
-  sensor[MINUS_Z] = config_sensor("/dev/i2c-3", 0x45, 400); 
+			
+  if (access("/dev/i2c-11", W_OK | R_OK) < 0)  {   // Test if I2C Bus 3 is present			
+	printf("/dev/i2c-11 is present\n\n");		
+  	sensor[PLUS_Z]  = config_sensor("/dev/i2c-11", 0x40, 400);
+  	sensor[MINUS_X] = config_sensor("/dev/i2c-11", 0x41, 400);
+  	sensor[MINUS_Y] = config_sensor("/dev/i2c-11", 0x44, 400);
+  	sensor[MINUS_Z] = config_sensor("/dev/i2c-11", 0x45, 400); 
+  } else {
+  	sensor[PLUS_Z]  = config_sensor("/dev/i2c-3", 0x40, 400);
+  	sensor[MINUS_X] = config_sensor("/dev/i2c-3", 0x41, 400);
+  	sensor[MINUS_Y] = config_sensor("/dev/i2c-3", 0x44, 400);
+  	sensor[MINUS_Z] = config_sensor("/dev/i2c-3", 0x45, 400); 
+  }	  
   		}
 		else
 		{