table of Contents
2 Connect the hardware and set
2.2 My Computer "Right Click "Device Manager" Port (COM) USB-serial CH340 (com3)
2.5 Enter account number: pi; password: raspberry
3.1 Enter sudo raspi-config in putty
4 Install vnc-viewer software and fileZilla software
4.1 Openand enter the ip of the Raspberry Pi
1 Burning system
step1：
Load the SD card into the card reader and format it with a PC
step2：
Use software: balenaEtcher (or Win32DiskImager) burn the image into the SD card.
step3：
Modify the configuration file
Open the config.txt file and add a command at the end (because I use the serial device USB-TTL to obtain the IP address)
enable_uart=1step4：
Insert the SD card into the corresponding position of the Raspberry Pi 3B+.
2 Connect the hardware and set
2.1 USB to UART module
GND------------GND
TXD-------------RXD
RXD------------TXD
2.2 My Computer "Right Click "Device Manager" Port (COM) USB-serial CH340 (com3)
Find the corresponding COM port
2.3 Open putty settings
Select Serial; enter COM3; 115200
2.4 Power on the Raspberry Pi
2.5 Enter account number: pi; password: raspberry
2.6 Set wifi signal
step1：
Import: sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
(Note: there is a space after nano)
step2:
Enter in the first line: country=CN
Enter wifi information in the last line:
network={
ssid=”Account”
psk="Password"
}
Remarks: You can repeat the above structure to input multiple wifi information
step3:
Then save the configuration: CTRL+O
step4:
Then press Enter: enter
step4:
Finally exit: CTRL+X
step5:
Then restart: sudo reboot
step6:
Wait for the restart: then enter the account and password
step7:
Check the network connection: ifconfig
May wish to test the network: ping baidu.com
This indicates that the network has been successfully connected
Then, CTRL+C to exit the test
3 open SSH and VNC services
3.1 Enter sudo raspi-config in putty
step1:
Select item 5 and press Enter
step2:
Select ssh and press enter
step3:
Choose yes
step4:
Select the fifth interfacing options again
Select vnc
step5:
Check finish to make the settings take effect
step6:
Enter sudo reboot to restart
4 Install vnc-viewer software and fileZilla software
4.1 Open and 
enter the ip of the Raspberry Pi
4.2 Open the software
