Other Boards

These are other boards that Espruino compiles for, but which aren't 'officially supported'. This means:

Note: ST Nucleo and Discovery boards are sold at a low price, for evaluation purposes only. According to the Evaluation products license agreement that comes with each board, you must not use them as part of a finished product. If you want to do that, please check out our official boards.

To see how to get started with the official boards, just follow our Quick Start guide, or you can Order one here.


Boards that Espruino works on

Chip Speed
Vars Cost USB UART SPI Bat Other
Official Boards
Espruino Original STM32F104 72 2200 £21 Y 3 2 Y Micro SD, Optional Bluetooth Serial, Proto area
Espruino Pico STM32F401 84 5100 £17 Y 3 2 Y
Espruino WiFi STM32F411 100 7100 -- Y 3 2 N WiFi
Espruino Puck.js nRF52832 64 2200 £25 N 1 1 Y Bluetooth LE, Case with Button, Accelerometer, Gyro, Magnetometer, Temperature
Espruino Pixl.js nRF52832 64 2200 £30 N 1 1 Y LCD Display, Arduino Headers, Bluetooth LE
Espruino Bangle.js nRF52832 64 2200 -- N - - Y LCD Display, Bluetooth LE, Vibration, Accelerometer
Espruino Bangle.js 2 nRF52840 64 12000 £64 N - - Y LCD Display, Bluetooth LE, Vibration, Accelerometer
Espruino MDBT42Q Breakout nRF52832 64 2200 £17 N 1 1 N Bluetooth LE
Espruino MDBT42Q Module nRF52832 64 2200 £10 N 1 1 N Bluetooth LE, Bare Module
Third Party Boards
Ruuvitag nRF52832 64 2000 $28 N 1 1 Y Bluetooth LE, Environment sensors
Seeed Wio LTE STM32F405 168 5450 $25 Y 6 3 Y Micro SD, LTE
Nordic Thingy:52 nRF52832 64 2000 $40 N 1 1 Y Environment & 9 Axis sensors, Mic and Speaker
nRF52832DK DK nRF52832 64 2000 $40 N 1 1 Y Arduino Headers
STM32L496GDISCOVERY STM32L496AGI6 168 19200 $70 Y 3 4 N Arduino Headers, Micro SD, Optional LTE/GSM modules
iTracker RAK8211 nRF52832 64 2000 $82 N 1 1 Y GPS, GPRS, LTE or NB-IoT
iTracker RAK8212 nRF52832 64 2000 $88 N 1 1 Y GPS, GPRS, LTE, NB-IoT
Other Boards
STM32VLDISCOVERY STM32F100 24 250 €12 N 3 2 N
STM32F3DISCOVERY STM32F303 72 2800 €14 Y 3 2 N
STM32F4DISCOVERY STM32F407 168 5000 €16 Y 6 3 N
ST NUCLEO-F401RE STM32F401 84 5300 €12 N 3 4 N Arduino Headers
ST NUCLEO-F411RE STM32F411 84 5300 €12 N 3 4 N Arduino Headers
OLIMEXINO-STM32 STM32F103RB 72 700 €20 Y 3 2 LiPo Arduino Headers, Micro SD
LeafLabs Maple RBT6 STM32F103RB 72 700 €40 Y 3 2 LiPo Arduino Headers
'HY' 2.4" LCD STM32F103VE 72 2800 €30 Y 3 2 N SD Card, LCD Display
'HY' 2.8" LCD STM32F103RB 72 700 €30 Y 3 2 N SD Card (unsupported),LCD Display
'HY' 3.2" LCD STM32F103VC 72 2000 €30 Y 3 2 N SD Card, LCD Display
micro:bit nRF51822 16 200 - Y 1 1 Y Bluetooth LE, LED matrix
micro:bit 2 nRF52833 64 6000 - Y 1 1 Y Bluetooth LE, LED matrix, Speaker, Mic
ESP8266 Xtensa 80 1023 €10 N 1 1 N WiFi
ESP32 Xtensa 240 5000 $10 N 2 2 N Bluetooth LE, Flash FS, WiFi

Key: Y=Yes, N=No

Note: Third party boards are designed, sold and supported by companies who help to support Espruino's continued development. They may or may not come with Espruino pre-installed, however we ensure that up to date firmware for these boards is available so you always have access to the newest features.

You can also see these boards listed with thumbnails at the top of the reference page.

After you've got a board, head to the Download page and then follow the instructions below in order to flash your board.



Good value, and can usually be purchased from well-known suppliers. It contains an SD card, Arduino-style headers, and conveniently a LiPo battery connector (with charger).

It comes pre-flashed with a bootloader. HOWEVER there is not enough space for this and Espruino, so you will need to overwrite it using a USB-TTL converter. See Serial Bootloader for instructions.

You can get this directly from Olimex or Farnell/Element14.

'HY' LCD Modules

These appear to come from Haoyu electronics and come in a few types, with varying LCD sizes. They are amazingly good value, and can be obtained from eBay (although they are often shipped direct from Hong Kong or China). They don't generally have a specific name or model number, so are hard to tell apart.

Espruino contains bitmap and vector fonts, and along with the SD card driver and space for saving variables Espruino starts to have trouble fitting in just 128kb of Flash - so we suggest that you avoid the RBT6-based board and head for the VET6 or VCT6 ones.

2.4" STM32F103VET6 - 512kb Flash, 64kb RAM - The largest board, but with the most features - 4 buttons, 4 LEDs, 2 Potentiometers, 2x USB, an RS232-level serial connection, SD card, buzzer, and a external flash chip. Has 'HY-STM32_100P' on the back of the PCB. BEWARE: There is a new version of this board that is wired up differently - Espruino will only drive the LCD on the original board.

2.8" STM32F103VET6 - 256kb Flash, 48kb RAM - This looks just like the 2.4" STM32F103VET6, but is UNTESTED (May work with 2.4" drivers)

2.8" STM32F103RBT6 - 128kb Flash, 20kb RAM - This works, however the board itself very basic with few peripherals, the CPU does not have much flash memory, and it is not recommended. RBT6 does not support the faster FSMC LCD interface, so LCD updates are slow. SD card is currently unimplemented. Has MINI-STM32-V3.0 on the main board under the LCD. BEWARE: Boards with an SD card and 'armjishu.com' written on the bottom are currently unsupported.

3.2" STM32F103VCT6 - 256kb Flash, 48kb RAM - Works well. It has a big display and it is quite fast. Few on-board peripherals though (2 LEDs, 2 Buttons and an SD card). Recommended.

3.2" STM32F103RBT6 - 128kb Flash, 20kb RAM - UNTESTED (May work with 2.8" drivers)

Wiring up a serial port

Every supported board except the STM32VLDISCOVERY has a USB serial port, so most users can skip this step. If you have an STM32VLDISCOVERY, or you want to use Bluetooth, or to connect to a Raspberry Pi using serial (rather than USB), please see the Wiring Up page.

Plug in Espruino

You communicate with Espruino using a Terminal Emulator over a Serial port. Most Espruino devices can emulate a Serial port over USB, so when you plug these in to your PC or Mac the Operating System will automatically detect them. All you need to do is find out what the Operating System has 'called' the serial port that has been created.

Windows XP Users: Windows XP seems not to have generic drivers for USB Virtual COM Ports installed, so you'll have to get them from ST via this link (thanks Josef!)

First off, you need to know which USB port to connect to:

ESPRUINO & PICO BOARDS There's just one USB port - so it's easy!
NUCLEOF4xxRE There's just one USB port, which serves as the programmer, serial port, and mass storage device.
STM32VLDISCOVERY You will have had to use a USB-TTL converter (see Wiring Up). After programming you'll need to connect at 9600 baud.
STM32F3DISCOVERY Plug in to the port labelled 'USB USER'. Note: This board is more difficult to connect to. You need to power up the board without 'USB USER' plugged in, and then plug in USB later. If you subsequently reset the board, you'll need to unplug USB and plug it back in.
STM32F4DISCOVERY Plug in to the port nearest the headphone Jack. Note: This board still needs power from an external source such as the USB port on the other side.
'HY' board Use either of the two available USB ports. The one nearest the power LED is a built-in USB-TTL converter, and the other is a Virtual COM port. Note: We'd suggest using the 'Virtual COM port' USB port as this is faster and shouldn't have flow control problems.
Olimexino STM32 Leaflabs Maple The one USB port

Don't plug the device in right away though.

Flashing Espruino

Espruino Board

See the Download page for more information - the Web IDE directly supports updating firmware on these boards.


STM32 (VL/F3/F4) Discovery

On Windows

On Linux/Mac

    brew install libusb  
    git clone https://github.com/texane/stlink.git  
    cd stlink  
Or by using the instructions here: [http://cu.rious.org/make/getting-stlink-to-work-on-mac-os-x-with-macports/](http://cu.rious.org/make/getting-stlink-to-work-on-mac-os-x-with-macports/) however Branton tells us that these are out of date.

Olimexino-STM32 AND LeafLabs Maple

Unfortunately the USB bootloader pre-installed on these devices takes up too much flash to allow a usable version of Espruino to be installed. This means you'll have to overwrite the USB bootloader. This is pretty simple - you just need a USB-TTL converter. It's also trivial to write the bootloader back in later on.

Just follow our Serial Bootloader instructions and use the file espruino_1vXX_olimexino_stm32.bin. If you want to restore your board to use the Maple bootloader, just use the binary file available from http://leaflabs.com/docs/bootloader.html#flashing-a-custom-bootloader

'HY' LCD Boards

The 'HY' boards have a USB-RS232 converter onboard, so to flash them, you can use the STM32's built-in bootloader:

In order to run the Python file from the link above, you may need to have Python 2.7 installed, and not the newest version of Python (version 3).

Raspberry Pi

The version for Raspberry Pi is a simple executable. Extract it from the ZIP file and make it executable with:

chmod a+x espruino_1vXX_raspberrypi

You may also want to rename it:

mv espruino_1vXX_raspberrypi espruino

Finally, just run it with:


Note that in order to use GPIO (or to start an HTTP server with a port number less than 1024), Espruino will need to be run as root:

sudo ./espruino

Also, the Raspberry Pi version doesn't currently support Serial, SPI, OneWire or I2C - which means you're stuck with GPIO.


Please Note: If you have saved code to Espruino, when booting it will load your saved JavaScript program from flash memory. Occasionally we change the way programs are stored in memory between versions in order to make Espruino more efficient, and when this happens, after flashing the latest version of Espruino to the device, it may stop booting. You can solve this in two ways:

See our Quick Start page for how to get started using Espruino itself.


Please see the ESP8266 page for more information.

BBC Micro:bit

Please see the Micro:bit page for more information.


Please see the ESP32 page for more information.

Third Party Boards

Official Espruino Boards

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