2. ELMduinoArduino OBD-II Bluetooth Scanner Interface Library for Car Hacking Projects
3. SerialTransferArduino library to transfer dynamic, packetized data fast and reliably via Serial, I2C, or SPI
4. DFPlayerMini FastFast and easy to understand Arduino library to use the DFPlayer Mini MP3 module from DFRobot.com. This is a huge improvement (both in terms of execution speed and simplicity) to the standard library provided by DFRobot.com.