diff --git a/SPI_M0/SPI_M0_RECEIVE/SPI_M0_RECEIVE.ino b/SPI_M0/SPI_M0_RECEIVE/SPI_M0_RECEIVE.ino
index fd4752d..a6db85a 100644
--- a/SPI_M0/SPI_M0_RECEIVE/SPI_M0_RECEIVE.ino
+++ b/SPI_M0/SPI_M0_RECEIVE/SPI_M0_RECEIVE.ino
@@ -4,7 +4,7 @@
 SPIClass mySPI (&sercom2, 3, 5, 4, SPI_PAD_0_SCK_3, SERCOM_RX_PAD_1); //digital 3,5,4 for PIN_SPI_MISO,  PIN_SPI_SCK,  PIN_SPI_MOSI
 
 void setup() {
-  Serial.begin(115200);
+  SerialUSB.begin(9600);
 
   // do this first, for Reasons
   mySPI.begin();
@@ -17,8 +17,9 @@ void setup() {
 
 uint8_t i=0;
 void loop() {
-  Serial.println(i);
   mySPI.beginTransaction(SPISettings(8000000, MSBFIRST, SPI_MODE0));
   int recu = mySPI.transfer(i++);
+  SerialUSB.println(recu);
   mySPI.endTransaction();
+  delay(100);
 }
diff --git a/SPI_M0/SPI_M0_SEND/SPI_M0_SEND.ino b/SPI_M0/SPI_M0_SEND/SPI_M0_SEND.ino
index 04547fc..25d9e20 100644
--- a/SPI_M0/SPI_M0_SEND/SPI_M0_SEND.ino
+++ b/SPI_M0/SPI_M0_SEND/SPI_M0_SEND.ino
@@ -4,7 +4,7 @@
 SPIClass mySPI (&sercom2, 3, 5, 4, SPI_PAD_0_SCK_3, SERCOM_RX_PAD_1); //digital 3,5,4 for PIN_SPI_MISO,  PIN_SPI_SCK,  PIN_SPI_MOSI
 
 void setup() {
-  Serial.begin(115200);
+  SerialUSB.begin(9600);
 
   // do this first, for Reasons
   mySPI.begin();
@@ -17,9 +17,10 @@ void setup() {
 
 uint8_t i=0;
 void loop() {
-  Serial.println(i);
+  SerialUSB.println(i);
   mySPI.beginTransaction(SPISettings(8000000, MSBFIRST, SPI_MODE0));
   mySPI.transfer(i++);
   mySPI.transfer(7);
   mySPI.endTransaction();
+  delay(100);
 }