diff --git a/crawler_code.ino b/crawler_code.ino
new file mode 100644
index 0000000..5d0b83b
--- /dev/null
+++ b/crawler_code.ino
@@ -0,0 +1,97 @@
+int val;
+
+int nb;
+
+void setup() {
+
+// setup code here run once:
+
+Serial.begin(9600);
+
+pinMode(9,OUTPUT);
+
+pinMode(8,OUTPUT);
+
+pinMode(7,OUTPUT);
+
+pinMode(6,INPUT);
+
+}
+
+// main code here, to run repeatedly:
+
+void loop()
+
+{
+if(Serial.available()>0)
+
+{
+
+int data= Serial.read();
+
+Stop();
+
+if(data=='R')
+
+{
+
+digitalWrite(9,HIGH);
+
+digitalWrite(8,LOW);
+
+digitalWrite(6,HIGH);
+
+digitalWrite(7,LOW);
+
+}
+
+else if(data=='L')
+
+{
+
+digitalWrite(9,LOW);
+
+digitalWrite(8,HIGH);
+
+digitalWrite(6,LOW);
+
+digitalWrite(7,HIGH);
+
+}else if(data=='F'){
+
+digitalWrite(9,LOW);
+
+digitalWrite(8,HIGH);
+
+digitalWrite(6,HIGH);
+
+digitalWrite(7,LOW);
+
+}else if(data=='B'){
+
+digitalWrite(9,HIGH);
+
+digitalWrite(8,LOW);
+
+digitalWrite(6,LOW);
+
+digitalWrite(7,HIGH);
+
+}
+
+}
+
+}
+
+void Stop()
+
+{
+
+digitalWrite(9,LOW);
+
+digitalWrite(8,LOW);
+
+digitalWrite(6,LOW);
+
+digitalWrite(7,LOW);
+}