Welcome to Raspberry Pi 4B repository

1.USB to TTL module connect to Raspberry pi board

We need to prepare three DuPont lines)

    RXD--------TXD0(GPIO14)
    TXD--------RXD0(GPIO15)
    GND--------Ground

Raspberry Pi pin distribution diagram:

Physical connection diagram:

After the wiring is completed, power on the Raspberry Pi, and plug the USB to TTL module into the USB port of the computer, and check the corresponding port number on the computer device management.

2. Login Raspberry Pi by serial port

2.1 Connect Raspberry Pi

First, we can open a WiFi hotspot via a mobile phone, then modify the Raspberry Pi configuration file to connect to the mobile network and open the SSH service.

!!! Note: that the laptop should also be connected to the WiFi hotspot of the phone.

You can search for the IP address of the Raspberry Pi by installing IPscanner on your computer, and then log in to the Raspberry Pi using putty.

!!Note:IP address just for example: user need input your own IP address.

2.2 Configure the serial port

We need to enter the command shown below at the command terminal:

sudo raspi-config

Change “Interfacing Options” -> “P6 Serial” -> “Yes” ->”OK”

Next, we can exit the setup and restart the Raspberry Pi.

2.3 Install ckermit

Enter the command shown below at the command terminal to install the ckermit tool

sudo apt-get install ckermit

Enter the command shown below at the command terminal to start kermit:

sudo kermit

Enter the following to set the serial port:

set line /dev/ttyS0

set speed 115200

set carrier-watch off

set handshake none

set flow-control none

set file type bin

set file name lit

set rec pack 1000

set send pack 1000

After the configuration is complete, enter exit to exit.

2.4 Serial remote login

Open the putty, select the Serial serial port, enter the corresponding port and baud rate, and finally click “open”.

Enter the user name pi and password.

If you make a mistake, you can re-enter it according to the prompt.

However, if you cannot enter it, the configuration is unsuccessful. Please reconfigure.

The above interface indicates that the login is successful.