USB Host Solution
ESP32-S2/S3 chips have built-in USB-OTG peripherals, which support USB host mode. Based on the USB host stack and various USB host class drivers provided by ESP-IDF, they can connect to a variety of USB devices through the USB interface. The following describes the USB Host solutions supported by ESP32-S2/S3 chips.
ESP USB Camera Video Solution
Supports the connection of a camera module through the USB interface, enabling the acquisition and transmission of MJPEG format video streams, with a maximum resolution of 480*800@15fps. Ideal for applications such as cat’s eye doorbells, smart door locks, endoscopes, rearview cameras, and other scenarios.
Features:
Quick Start
Hot Plug Support
Cameras that support UVC1.1/1.5 Specifications
Automatic Descriptor Parsing
Dynamic Resolution Configuration
MJPEG Video Stream Transmission
Bulk or Isochronous Transfer Modes
Hardware:
Chips: ESP32-S2, ESP32-S3
Peripherals: USB-OTG
USB Camera: Supports MJPEG format, with a bulk transfer mode of 800*480@15fps, or an isochronous transfer mode of 480*320@15fps. For camera limitations, refer to the usb_stream API documentation.
links:
Example Code: USB Camera + WiFi Image Transmission: usb/host/usb_camera_mic_spk
Example Code: USB Camera + Local Screen Display with LCD: usb/host/usb_camera_lcd_display
ESP USB Audio Solution
Supports connecting USB audio devices through the USB interface, enabling PCM format audio stream acquisition and transmission. It can simultaneously support multiple channels of 48KHz 16bit speakers and multiple channels of 48KHz 16bit microphones. Also supports Type-C interface headphones, suitable for audio playback scenarios. It can operate simultaneously with UVC, making it suitable for scenarios such as doorbell intercoms.
Features:
Quick Start
Hot Swap
Automatic Parsing Descriptors
PCM Audio Format
Dynamic Modification of Sampling Rate
Multi-Channel Speakers
Multi-Channel Microphone
Support Volume and Mute Control
Support Simultaneous Work with USB Camera
Hardware:
Chips: ESP32-S2, ESP32-S3
Peripherals: USB-OTG
USB Audio Devices: Supports PCM format
Links:
Example Code: MP3 Music Player + USB Headphones: usb/host/usb_audio_player
ESP USB 4G Networking Solutions
Supports connecting 4G Cat.1 or Cat.4 modules via the USB interface, enabling PPP dial-up for internet access. It also supports sharing the internet via Wi-Fi SoftAP hotspot for other devices. Suitable for IoT gateways, MiFi mobile hotspots, smart energy storage, advertising lightboxes, and other scenarios.
Features:
Quick Start
Hot Plug
Modem+AT Dual Interface
PPP Standard Protocol
4G to Wi-Fi Hotspot Support
NAPT (Network Address and Port Translation) Support
Power Management Support
Automatic Network Recovery
SIM Card Detection and Signal Quality Monitoring
Web-based Configuration Interface
Hardware:
Chips: ESP32-S2, ESP32-S3
Peripherals: USB-OTG
4G Modules: Supports Cat.1, Cat.4, and other network standard 4G modules, requiring module support for the PPP protocol.
Links:
Example Code: 4G Wi-Fi Router: usb/host/usb_cdc_4g_module
ESP USB Storage Solution
Supports connecting standard USB flash drives via the USB interface (compatible with USB 3.1/3.0/2.0 protocols), and can mount the USB flash drive to the FatFS file system for file read and write operations. Suitable for outdoor advertising billboards, attendance machines, mobile speakers, recorders, and other application scenarios.
Features:
Compatible with USB 3.1/3.0/2.0 Flash Drives
Default Support for Up to 32GB
Hot Plug
Support for Fat32/exFAT Formats
File System Read and Write
USB Flash Drive Over-The-Air (OTA) Update
Hardware:
Chips: ESP32-S2, ESP32-S3
Peripherals: USB-OTG
USB Flash Drive: Formatted as Fat32 by default, with support for USB drives up to 32GB. Drives larger than 32GB require exFAT file system support.