Note: If the screen is still blank you should double check the connections (power led on the Arduino is a good thing to check).

But, when you start typing you will notice that the characters you're writing are getting looped back to your terminal. Then run the following: screen /dev/ttyAMA0 115200

Screen is a dead simple way of connecting to a serial port. Note: make sure you don't connect a usb cable to the Arduino. If you're more interested with communicating with other devices then maybe the following suits you:ĭo you have an Arduino? You can run a simple test by putting this sketch on your Arduino: #define SERIAL_BAUD 115200Īnd wire it up using the following diagram: You can do that with the script located here. (go down to the Logic voltage levels section)įirst, you need to make sure that Raspbian has released the serial console. See more information about level shifters here. Note: the Raspberry Pi runs on 3.3V so you must be sure that anything you connect to it is running 3.3V or has a level shifter. You can get them from Digikey or Sparkfun. Connection for this is easy.Īre you trying to issue commands to the Raspberry Pi? (like a console?) I would suggest a plain jane 3.3V FTDI cable. The code for this is exactly the same the one with above. Second and easier, you can buy a FTDI USB to TTL converter and use GPIOs to have a serial communication with Rpi. But it is better to get a USB hub for all mouse, keyboard and dongle. Port = serial.Serial('/dev/ttyAMA0', baudrate = 7200, timeout = 2)įirst, you can buy a USB dongle for RS-232/ RS-485 so that you would not use GPIO pins. For that go to the folder where you keep your python code and type python name.py. In case you can't run the code from idle (that happens for some libraries), do it in terminal. By the way, timeout is the time gap between each message you are receiving. You can check and set it from device manager in Windows. Also make sure that baudrate should be same in putty and COM1, which is the port that RS-232 is connected to your PC.

It could be less or more depending on the synchronization. Also you will see the baudrate in the code is 7200. You can easliy get it via terminal by typing sudo apt-get install python-serial. But before that make sure that you have the library called serial for python to create the communication. Now you are ready to do some coding in Python. Actually read the whole thing for better understanding.Ĥ) Power your converter module with either 3.3V (pin 1) or 5.0V (pin 2), connect Rxd pin of the module to Rxd (pin 8) on Rpi and Txd pin to Txd (pin 10) on Rpi.ĥ) Connect your RS-232 (from PC) cable to the converter module 2) Buy a Serial Port RS232 to TTL Converter Module and a RS-232 serial cable for PC.ģ) Follow the steps in Connection to a microcontroller or other peripheral on this

Test serial connection on raspberry pi