2-Pack — Mini USB Host Shield — MAX3421E 3.3V for Arduino Pro Mini, ESP32, STM32

Two compact USB host shields designed for 3.3V microcontrollers. Perfect for projects that need USB host on multiple nodes, or grab a spare for your next build. Connect USB devices — keyboards, mice, game controllers, Bluetooth dongles, and more — to your Arduino Pro Mini, ESP32, ESP8266, STM32, or any other 3.3V board.

Key Features

• MAX3421E USB host controller — full USB 2.0 host capability
• 3.3V logic level — native compatibility with ESP32, STM32, ESP8266, Arduino Pro Mini 3.3V
• Also works with 5V Arduinos when used with a logic level converter
• Compact form factor for space-constrained projects
• SPI interface
• Works with the USB Host Shield 2.0 library

What's Included

• 2x Mini USB Host Shield modules

Compatible Boards

• Arduino Pro Mini 3.3V
• ESP32 / ESP8266
• STM32 "Blue Pill" (STM32F103C8T6)
• Teensy, SAMD21, and other 3.3V MCUs with SPI
• 5V Arduino boards with logic level converter

Common Applications

• USB keyboard/mouse input for embedded projects
• Game controller interfaces
• Bluetooth communication (with USB Bluetooth dongle)
• USB barcode scanner integration
• Compact IoT projects requiring USB host functionality

Software Support

Works with the open-source USB Host Shield 2.0 library — extensive documentation and examples available on GitHub.

Also Available

• Single Mini USB Host Shield ($10.99): https://www.ebay.com/itm/292337943795
• Full-size USB Host Shield for UNO/MEGA ($15.99): https://www.ebay.com/itm/292334136737
• USB Host Shield + UNO Kit ($19.99): https://www.ebay.com/itm/293031309980

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