diff --git a/cubesatsim/cubesatsim.ino b/cubesatsim/cubesatsim.ino
index a50bcaa0..e4cdbcdc 100644
--- a/cubesatsim/cubesatsim.ino
+++ b/cubesatsim/cubesatsim.ino
@@ -3856,10 +3856,10 @@ void get_serial_string() {
 
 void get_serial_char() {	
   unsigned int elapsed_time = (unsigned int) millis();	
-  while ((millis() - elapsed_time) < 20000) && (Serial.available() < 1)) { }
+  while (((millis() - elapsed_time) < 20000) && (Serial.available() < 1)) { }
   if (Serial.available() > 0) {	 
     serial_string[0] = Serial.read();  // get character
-    Serial.write(input);
+    Serial.write(serial_string[0]);
     serial_string[1] = 0;	
     Serial.println(" ");
   } else