diff --git a/cubesatsim/cubesatsim.ino b/cubesatsim/cubesatsim.ino
index 4bf59c2a..310e858d 100644
--- a/cubesatsim/cubesatsim.ino
+++ b/cubesatsim/cubesatsim.ino
@@ -1344,7 +1344,8 @@ void get_tlm_fox() {
 //void write_wave(int i, short int *buffer)
 void write_wave(int i, byte *buffer)
 {
-    buffer[ctr++] = (byte)(phase == 1); 			
+    buffer[ctr++] = (byte)(phase == 1); 
+    Serial.printf("buffer is %d \n", buffer[ctr - 1]);	
     if (ctr > bufLen) {
 	ctr = ctr - bufLen;
 	if (debug_mode) {