diff --git a/readme.md b/readme.md
index 658b1c5..f3c3739 100644
--- a/readme.md
+++ b/readme.md
@@ -23,6 +23,8 @@
 ### HC-05
 - [Datasheet](https://components101.com/sites/default/files/component_datasheet/HC-05%20Datasheet.pdf)
 - [How to configure](https://lastminuteengineers.com/hc05-at-commands-tutorial/)
+- [User Instruction manual](https://www.rcscomponents.kiev.ua/datasheets/hc_hc-05-user-instructions-bluetooth.pdf)
+- [Interfacing HC05 with Arduino](https://lastminuteengineers.com/hc05-bluetooth-arduino-tutorial/)
 
 ### 3.5 inch TFT display
 - [Product link](https://www.tinytronics.nl/shop/en/displays/tft/3.5-inch-tft-display-320*480-pixels-mega-compatible-ili9486)
diff --git a/test_elm327.ino b/test_elm327.ino
new file mode 100644
index 0000000..2ff3326
--- /dev/null
+++ b/test_elm327.ino
@@ -0,0 +1,57 @@
+#include "ELMduino.h"
+
+
+#define ELM_PORT Serial2
+
+
+ELM327 myELM327;
+
+
+uint32_t rpm = 0;
+
+
+void setup()
+{
+#if LED_BUILTIN
+  pinMode(LED_BUILTIN, OUTPUT);
+  digitalWrite(LED_BUILTIN, LOW);
+#endif
+
+  Serial.begin(115200);
+  ELM_PORT.begin(115200);
+
+  
+  int bt_state = digitalRead(11);
+  while (bt_state == 0)
+  {
+    bt_state = digitalRead(11);
+    Serial.println(bt_state);
+    Serial.println("bt not connected");
+    delay(100);
+  }
+  Serial.println("bt connected");
+
+  Serial.println("Attempting to connect to ELM327...");
+
+  if (!myELM327.begin(ELM_PORT, true, 20000))
+  {
+    Serial.println("Couldn't connect to OBD scanner");
+    while (1);
+  }
+
+  Serial.println("Connected to ELM327");
+}
+
+
+void loop()
+{
+  float tempRPM = myELM327.rpm();
+
+  if (myELM327.nb_rx_state == ELM_SUCCESS)
+  {
+    rpm = (uint32_t)tempRPM;
+    Serial.print("RPM: "); Serial.println(rpm);
+  }
+  else if (myELM327.nb_rx_state != ELM_GETTING_MSG)
+    myELM327.printError();
+}