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Yes. An ESP32-S3 can enumerate as a USB keyboard, mouse, MIDI device, mass-storage device, serial interface, or a composite of supported functions. “Pretend” is shorthand: the chip runs USB device software that presents the functions and descriptors the host expects. The key distinction is that this requires the ESP32-S3’s flexible USB-OTG device path—not its separate, fixed-function USB-Serial-JTAG controller.
What “acting like a USB device” means
A computer recognizes a USB device through its descriptors and the functions it implements. With Espressif’s TinyUSB-based USB Device Stack, an ESP32-S3 application can provide documented classes including CDC serial, HID, MIDI, and mass storage, as well as vendor-specific functions and composite devices. Espressif’s examples include a keyboard and mouse, MIDI, serial, storage, and network-over-USB.
These are software-defined behaviors, not a guarantee that every USB class is equally simple to implement or that every combination will work without design constraints. For the documented stack and examples, see Espressif’s ESP-IDF v6.0 USB Device Stack guide.
USB-OTG device stack versus USB-Serial-JTAG
The ESP32-S3’s USB-OTG peripheral is the route for implementing configurable USB device functions such as HID. USB-Serial-JTAG is a different, built-in controller for serial and JTAG functions. It is not a general-purpose controller that can be reconfigured as a keyboard, mouse, or arbitrary USB class.
#1 Best Overall
- 🔥【Dual Mode & High Performance】 The ESP32-S3 development board features integrated dual-core xtensa 32-bit LX7 microprocessor, clock speed up to 240 MHz, with 16MB Flash and 8 MB PSRAM. Perfect for Arduino IoT projects requiring stable wireless communication with ultra-low power consumption.
- 🔧【Easy Programming & Debugging】 Equipped with dual USB Type-C ports, this ESP32-S3 board supports both USB and UART modes for effortless programming, firmware flashing, and debugging.
- 🌐【Versatile Wireless Connectivity】 Built-in Wi-Fi (2.4GHz) and Bluetooth 5.0 (LE) dual-mode ensure seamless connectivity with a wide range of smart devices, making it ideal for IoT, smart homes projects.
- 🚀【Flexible Download Options】 Supports dual download methods — USB direct download or USB-to-serial download — offering flexibility and convenience for different development needs.Ideal for beginners and developers working with ESP32-S3.
- 🔋【Advanced Power-Saving Modes】 Designed for energy-efficient applications, with 3.3V SPI voltage, the ESP32-S3 board supports multiple low-power modes, allowing you to extend battery life based on different usage scenarios.
Check the board’s USB wiring first
The ESP32-S3’s native USB data signals are D+ on GPIO20 and D− on GPIO19. For USB device operation, those signals must be connected to the host through a suitable connector or wiring. A development board may have a USB connector connected instead to a separate USB-to-UART bridge; a connector that can flash or provide a serial console is not necessarily wired to the native USB pins.
Check the board schematic or documentation to identify which connector reaches GPIO20 and GPIO19. Some boards expose separate connectors for native USB and USB-Serial-JTAG. If the native USB connection is not brought to a connector, a suitable breakout and correctly wired data cable may be an option, subject to the board’s documentation.
Rank #2
- ESP32-S3-DevKitC-1-N16R8 SPI voltage: 3.3v, ESP32-S3-DevKitC-1 is an entry-level development board equipped with Wi-Fi + Bluetooth module ESP32-S3
- Most of the I/O pins on the module are broken out to the pin headers on both sides of this board for easy interfacing. Developers can either connect peripherals with jumper wires or mount ESP32-S3-DevKitC on a breadboard.
- The ESP32-S3-DevKitC development board equipped with ESP32-S3-DevKitC-1-N16R8, a general-purpose Wi-Fi + Bluetooth LE MCU module that integrates complete Wi-Fi and Bluetooth LE functions.
- ESP32-S3-N16R8 cable can be used: USB Type A to Type-C cable or CC cable Note the distinction between the commonly used USB A port to Type-C cable that can only be charged, which cannot be used for communication between YD-ESP32-S3 and the host.
- USB-to-UART Port and ESP32-S3 USB Port (either one or both), default power supply (recommended)
Set up a TinyUSB-based device in ESP-IDF
- Choose the native USB connection. Confirm that the selected board connector reaches GPIO20/D+ and GPIO19/D−, rather than only a USB-to-UART bridge or USB-Serial-JTAG interface.
- Add Espressif’s USB device component. In an ESP-IDF project, run
idf.py add-dependency esp_tinyusb. Espressif distributes its TinyUSB-based device stack as a managed component. - Start from a matching example. For a keyboard or mouse, use the documented
tusb_hidexample. For a serial-plus-storage design, usetusb_composite_msc_serialdevice. The examples are starting points, not proof that every target host or custom device design is compatible. - Configure descriptors and functionality. Device and string descriptors identify the device to the host; the configuration descriptor describes its USB configuration. Implement and configure the class behavior your application needs.
- Test on the intended hosts. Verify enumeration and actual behavior with the operating systems and applications the device is meant to support. Host compatibility depends on the implementation and host environment.
Plan around the shared USB PHY
The USB-OTG device controller and USB-Serial-JTAG share the ESP32-S3’s internal PHY, and only one can use that PHY at a time. If an application takes over the native USB path for device operation, do not assume the same internal-PHY connection will also continue to provide the usual USB-Serial-JTAG flashing or debugging interface.
Espressif documents using an external PHY when USB device operation and USB-Serial-JTAG must be available simultaneously. It also documents switching the debugging interface to plain JTAG using appropriate eFuses. Both choices affect hardware or configuration, so decide how the board will be programmed and debugged before relying on the native USB connection for the application.
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Rank #3
- 【Low-power performance】: The AYWHP ESP32-S3 Core development board integrates a 2.4 GHz Wi-Fi and Bluetooth 5 (LE) dual-mode communication module, perfect for Arduino Internet of Things (IoT) projects.
- 【Simple programming and debugging】: The ESP32-S3 module makes it easy to program and burn in your ESP32-S3 board via dual USB Type-C ports, with a choice of USB or UART modes.
- 【Multiple Power Saving Modes】: The ESP S3 development board supports multiple low-power modes, which can be configured according to different application scenarios to provide longer battery life.
- 【Dual download modes】: The ESP S3-1 module supports both USB direct connection download and USB to serial port download, providing more flexibility and convenience.
- 【Diverse connectivity options】: The ESP32-S3-1 supports dual-mode Wi-Fi and Bluetooth 5.0 (LE) connectivity for a wide range of smart devices, making it ideal for Internet of Things (IoT) applications.
Composite devices must fit the endpoint limit
A composite device exposes multiple USB functions through one physical connection, but the documented USB Device Stack has a maximum of six endpoints: five IN/OUT and one IN. Each function consumes endpoint resources, so the number and combination of classes are constrained by the available endpoints. Check the endpoint needs of the selected examples and classes before combining them.
Mass storage has performance and power considerations
Espressif documents USB mass storage using SPI flash and SD/MMC storage. Its ESP-IDF v6.0 guide reports the following example read and write rates at two FIFO sizes; these are documentation figures, not a general benchmark guarantee:
Rank #4
- 【ESP32-S3 PERFORMANCE】Dual-core 240MHz processor with 16MB Flash and 8MB PSRAM for IoT, AI, and machine learning projects.
- 【WIRELESS CONNECTIVITY】Onboard antenna for 2.4GHz WiFi and Bluetooth 5.0 LE — for smart home devices, no external antenna needed.
- 【LEAD-FREE GOLD EDITION DESIGN】Immersion gold (ENIG) plating for durability and conductivity. Lead-free, RoHS-compliant — for long-term prototyping.
- 【PRE-SOLDERED, PLUG-IN DESIGN】ESP32-S3 boards come with pre-soldered headers and plug directly into the included expansion and terminal boards — no soldering required.
- 【MULTI-PLATFORM COMPATIBILITY】Works with C++, MicroPython, ESP-IDF, Raspberry Pi, and STM32 — with online tutorials for quick start. Power via USB-C (5V) or VIN pin (5–12V); do not exceed 5V on the USB-C ports.
| FIFO size | Read rate | Write rate |
|---|---|---|
| 512 B | 0.566 MB/s | 0.236 MB/s |
| 8192 B | 0.925 MB/s | 0.928 MB/s |
The same guide cautions that writes to internal flash can suspend program execution and recommends external storage for higher-performance practical use. A self-powered USB device also needs to monitor VBUS; Espressif describes using a comparator or voltage divider because ESP32-S3 pins are 3.3 V tolerant.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.USB device mode does not automatically provide firmware updates
An application that enumerates as a USB device does not, by itself, establish a usable firmware-update path. ROM USB-OTG Device Firmware Upgrade (DFU) is a separate bootloader feature: Espressif says the chip must be in bootloader mode to be detected. The internal PHY defaults to USB-Serial-JTAG; the DFU guide documents use of an external PHY or permanent reassignment with the USB_PHY_SEL eFuse for USB-OTG DFU.
Best Value
- 【GOLD EDITION — IMMERSION GOLD PCB】The Lonely Binary Gold Edition features a black PCB with lead-free immersion gold (ENIG) plating and clear silkscreen — the signature finish of the Lonely Binary Gold Edition line. RoHS-compliant.
- 【16MB FLASH + 8MB PSRAM】Large memory capacity for OTA updates, large programs, and AI/ML tasks — more headroom than 4MB boards for data-intensive IoT and automation projects.
- 【EXTERNAL IPEX ANTENNA】External IPEX antenna can be positioned for extended WiFi and Bluetooth signal coverage — for remote applications like weather stations, robots, or enclosed builds.
- 【DUAL USB TYPE-C PORTS】Separate power and data ports for macOS, Windows, and Linux. Power via USB-C (5V) or VIN pin (5–12V); do not exceed 5V on the USB-C ports.
- 【FLEXIBLE PROTOTYPING PINS】2x40-pin GPIO headers compatible with breadboards and sensors. Supports external ToF sensors via I2C for distance sensing.
Espressif documents the commands idf.py dfu and idf.py dfu-flash. The host setup also matters: the guide notes WinUSB requirements on Windows and udev setup on Linux for dfu-util. Secure Boot, flash encryption, and Secure Download Mode can affect or disable ROM USB-OTG DFU availability. Check Espressif’s ESP32-S3 DFU guide against the boot mode, PHY assignment, security configuration, and host you intend to use.
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