Adafruit USB Host BFF for QT Py or Xiao with MAX3421E
Adafruit USB Host BFF for QT Py or Xiao with MAX3421E is backordered and will ship as soon as it is back in stock.
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We deliver across Australia, and here are the options (based on your location; view them on the cart page):
- Standard Post: Starting at $7 (6+ business days, with tracking)
- Express Post: Starting at $11 (2+ business days, with tracking)
- Same Day Delivery: Available for Sydney orders.
- Non-metro WA, NT, SA, and TAS: May take an additional 2+ days.
The Adafruit USB Host BFF adds USB Host capability to your QT Py or Xiao board, letting you connect keyboards, mice, game controllers, or USB storage devices to your tiny microcontroller projects. Built around the MAX3421E USB Host chip, it communicates via SPI for broad compatibility.
The compact BFF form factor plugs directly onto your QT Py. A Micro-B OTG connector keeps things small—use a standard OTG adapter to connect full-size USB devices. A P-FET power switch lets you control 5V power to peripherals via GPIO or the MAX3421E's built-in pin.
Key Features
- MAX3421E USB Host – SPI interface with IRQ pin
- BFF Form Factor – Plugs directly onto QT Py or Xiao
- Micro-B OTG Connector – Compact USB host port
- Power Switching – P-FET controlled 5V to peripherals
- TinyUSB Support – Native Arduino library integration
Compatible Chips
- RP2040
- ESP32-S2, ESP32-S3
- nRF52840
- SAMD21/SAMD51
Supported Devices
- Keyboards and mice (HID)
- Game controllers
- USB mass storage (flash drives)
- CDC serial devices
Package Contents
- 1× USB Host BFF board
- 1× Header set for soldering
Resources
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