serial test added

Author: rupava

Serial_Test/Serial_Test.ino

@@ -0,0 +1,20 @@
+int count = 0;
+unsigned long previousMillis = 0;
+const long interval = 1000;
+
+void setup() {
+  Serial.begin(115200);
+}
+void loop() {
+  unsigned long currentMillis = millis();
+
+  if(Serial.available()>0){
+    Serial.println("Back: "+Serial.readString());
+  }
+
+  if (currentMillis - previousMillis >= interval) {
+    previousMillis = currentMillis;
+    Serial.println("Ping: "+String(count));
+    count++;
+  }
+}