Mini USB Host Shield — MAX3421E 3.3V for Arduino Pro Mini, ESP32, STM32
Compact USB host shield designed for 3.3V microcontrollers. Connect USB devices — keyboards, mice, game controllers, Bluetooth dongles, and more — to your Arduino Pro Mini, ESP32, ESP8266, STM32 "Blue Pill," or any other 3.3V board with an SPI interface.
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
- 1x Mini USB Host Shield module
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
- 2-Pack Mini USB Host Shield ($18.99): https://www.ebay.com/itm/292337946151
- 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
Multi-item discount: 10% off 3 items, 15% off 5+ items. Applies to most of our store.
FREE Shipping to USA and APO addresses. Ships same or next business day from Georgia.
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