diff --git a/firmware/sketch_aug4a/sketch_aug4a.ino b/firmware/sketch_aug4a/sketch_aug4a.ino
index a9b5113..20acc7c 100644
--- a/firmware/sketch_aug4a/sketch_aug4a.ino
+++ b/firmware/sketch_aug4a/sketch_aug4a.ino
@@ -5,16 +5,34 @@ void setup() {
 
 void loop() {
   // put your main code here, to run repeatedly:
-  Serial.println("#Start Buffer");
-  delay(2000);
-  Serial.println("#Buffer Completed");
-  delay(2000);
-  Serial.println("#Start Buffer");
-  delay(2000);
-  Serial.println("#Sample Completed");
-  delay(3000);
-  Serial.println("RESULT SN 18291 1937.23 2828.11 28211.20 121829.12");
-  delay(15000);
 
-  // Serial.println("#ERROR");
+  Serial.println("SN:182829");
+  while (Serial.available() == 0) {}     //wait for data available
+  String bufferCommand = Serial.readString();  //read until timeout
+  bufferCommand.trim();                        // remove any \r \n whitespace at the end of the String
+  if (bufferCommand == "B") {
+    Serial.println("#Start Buffer");
+    delay(2000);
+    Serial.println("#Buffer Completed");
+  }
+
+  while (Serial.available() == 0) {}     //wait for data available
+  String SampleCommand = Serial.readString();  //read until timeout
+  SampleCommand.trim();                        // remove any \r \n whitespace at the end of the String
+  if (SampleCommand == "S") {
+    Serial.println("#Sample Started");
+    delay(2000);
+    Serial.println("#Sample Completed");
+  }
+
+  while (Serial.available() == 0) {}     //wait for data available
+  String resultCommand = Serial.readString();  //read until timeout
+  resultCommand.trim();                        // remove any \r \n whitespace at the end of the String
+  if (resultCommand == "R") {
+    delay(3000);
+    Serial.println("RESULT SN 18291 1937.23 2828.11 28211.20 121829.12");
+    delay(15000);
+  }
+
+  // Serial.println("#ERROR 100");
 }