WIKI: waveshare.com/wiki/3.5inch_HDMI_LCD?amazon

Features

• 480x320 hardware resolution, configurable by software. (up to 1920x1080)
• Resistive touch control
• Compatible and Direct-connect with any revision of Raspberry Pi (If you are using a Raspberry Pi Zero / Zero 2 W, an additional HDMI cable is required)
• Supports Raspberry Pi OS / Ubuntu / Kali and Retropie systems.
• Also works as a computer monitor, in this case, the touch panel is unavailable and HDMI cable is required
• When only used for display, does not occupy any I/O resources (using touch function will occupy I/O resources).
• Multi-languages OSD menu, for power management, brightness/contrast adjustment, etc.
• Supports HDMI audio output

Hardware Connection

1. Connect the GPIO interface

Raspberry Pi leads out 40 GPIO pins, while the screen leads out 26 pins. When connecting, pay attention to the corresponding pins and Raspberry Pi pins.

2. Connect the HDMI connector to the HDMI port of the screen and the Pi.

3. Turn the Backlight on the back of the LCD to "ON".

Note: Raspberry Pi Zero / Zero 2 W needs an additional HDMI cable for connection.