In this tutorial we will see how to use the serial port on Raspberry Pi. We will use the serial port available on Raspberry with a RS232/TTL 3-5,5V adapter and a USB-serial adapter. By default the Raspberry Pi’s serial port is configured to be used for console input/output. This can help to fix problems during boot, or to log in to the Pi if the video and network are not available.
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To be able to use the serial port to connect and talk to other devices (e.g. a modem a printer.. ), the serial port console login needs to be disabled.
Here we use Raspberry Pi 2, and we connect a RS232/TTL 3-5,5V adapter to pins 4 (5V), 6 (GND) ,8 (TX),10 (RX) of Raspberry, obviously connect tx with rx and vice versa.
To search for available serial ports we use the command
The output is something like this
Last line indicates that the console is enabled on the serial port ttyAMA0, so we disable it
Run the configuration command and follow the instructions below
Reboot and try with
output now is
Now we can use the serial ttyAMA0. We connect an adapter usb / serial, then we will try to establish a communication between the two serial ports; obviously in a practical application to every serial we could connect a device, for example a modem, a printer a RFID reader etc.
After connecting the second serial port we launch the command to find the name that Raspberry gives him
The output is something like this
Ok, now we create two files, one who writes something on the ttyAMA0 port and the other that reads on the ttyUSB0 port.
serial_write.py
serial_read.py
If we run both files, serial_read.py will read what serial_write.py writes
This is just a small example but it can serve as a starting point to send a print to an old printer or read data from a router or a gps.
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