MicroPython - Python for microcontrollers

ESP32-S3

Vendor: Espressif

Features: BLE, External Flash, External RAM, WiFi

Source on GitHub: esp32/ESP32_GENERIC_S3

More info: Website

The following files are firmware that should work on most ESP32-S3-based boards with 4/8MiB of flash, including WROOM and MINI modules.

This firmware supports configurations with and without SPIRAM (also known as PSRAM) and will auto-detect a connected SPIRAM chip at startup and allocate the MicroPython heap accordingly. However if your board has Octal SPIRAM, then use the "spiram-oct" variant.

If your board has 4MiB flash (including ESP32-S3FH4R2 based ones with embedded flash), then use the "flash-4m" build.

Installation instructions

Program your board using the esptool.py program, found here.

Windows users: You may find the installed program is called esptool instead of esptool.py.

Erasing

If you are putting MicroPython on your board for the first time then you should first erase the entire flash using:

esptool.py erase_flash

esptool.py will try to detect the serial port with the ESP32 automatically, but if this fails or there might be more than one Espressif-based device attached to your computer then pass the --port option with the name of the target serial port. For example:

esptool.py --port PORTNAME erase_flash

On Linux, the port name is usually similar to /dev/ttyUSB or /dev/ttyACM0.
On Mac, the port name is usually similar to /dev/cu.usbmodem01.
On Windows, the port name is usually similar to COM4.

Flashing

Then deploy the firmware to the board, starting at address 0:

esptool.py --baud 460800 write_flash 0 ESP32_BOARD_NAME-DATE-VERSION.bin

Replace ESP32_BOARD_NAME-DATE-VERSION.bin with the .bin file downloaded from this page.

As above, if esptool.py can't automatically detect the serial port then you can pass it explicitly on the command line instead. For example:

esptool.py --port PORTNAME --baud 460800 write_flash 0 ESP32_BOARD_NAME-DATE-VERSION.bin

Troubleshooting

If flashing starts and then fails partway through, try removing the --baud 460800 option to flash at the slower default speed.

If these steps don't work, consult the MicroPython ESP32 Troubleshooting steps and the esptool documentation.

Important: From the options below, download the .bin file for your board.

Firmware

Releases

v1.24.1 (2024-11-29) .uf2 / [.app-bin] / [.bin] / [.elf] / [.map] / [Release notes] (latest)

v1.24.0 (2024-10-25) .uf2 / [.app-bin] / [.bin] / [.elf] / [.map] / [Release notes]

v1.23.0 (2024-06-02) .uf2 / [.app-bin] / [.bin] / [.elf] / [.map] / [Release notes]

v1.22.2 (2024-02-22) .uf2 / [.app-bin] / [.bin] / [.elf] / [.map] / [Release notes]

v1.22.1 (2024-01-05) .uf2 / [.app-bin] / [.bin] / [.elf] / [.map] / [Release notes]

v1.22.0 (2023-12-27) .uf2 / [.app-bin] / [.bin] / [.elf] / [.map] / [Release notes]

v1.21.0 (2023-10-05) .uf2 / [.app-bin] / [.bin] / [.elf] / [.map] / [Release notes]

v1.20.0 (2023-04-26) .uf2 / [.bin] / [.elf] / [.map] / [Release notes]

v1.19.1 (2022-06-18) .uf2 / [.bin] / [.elf] / [.map] / [Release notes]

v1.18 (2022-01-17) .bin / [.elf] / [.map] / [Release notes]

Preview builds

v1.25.0-preview.229.g0d46e45a1 (2025-01-26) .uf2 / [.app-bin] / [.bin] / [.elf] / [.map]

v1.25.0-preview.228.g55ca3fd67 (2025-01-26) .uf2 / [.app-bin] / [.bin] / [.elf] / [.map]

v1.25.0-preview.225.g13b13d1fd (2025-01-26) .uf2 / [.app-bin] / [.bin] / [.elf] / [.map]

v1.25.0-preview.223.ga4ab84768 (2025-01-24) .uf2 / [.app-bin] / [.bin] / [.elf] / [.map]

(These are automatic builds of the development branch for the next release)

Firmware (4MiB flash)