Sony's Spresense is a small, but powerful development board with a 6 core Cortex-M4F microcontroller and integrated GPS, and a wide variety of add-on modules including an extension board with headphone jack, SD card slot and microphone pins, a camera board, a sensor board with accelerometer, pressure, and geomagnetism sensors, and Wi-Fi board - and it's fully supported by Edge Impulse. You'll be able to sample raw data, build models, and deploy trained machine learning models directly from the studio.
To get started with the Sony Spresense and Edge Impulse you'll need:
- The Spresense main development board - available for around 55 USD from a wide range of distributors.
- A micro-SD card to store samples.
In addition you'll want some sensors, these ones are fully supported (note that you can collect data from any sensor on the Spresense with the data forwarder):
- For audio models: an electret microphone and a 2.2K Ohm resistor, wired to the extension board's audio channel A, following this schema (picture here).
- Note: for audio models you must also have a FAT formatted SD card for the extension board, with the Spresense's DSP files included in a
BINfolder on the card, see instructions here and a screenshot of the SD card directory here.
The Edge Impulse firmware for this development board is open source and hosted on GitHub: edgeimpulse/firmware-sony-spresense.
The Spresense product family.
To set this device up in Edge Impulse, you will need to install the following software:
With all the software in place it's time to connect the development board to Edge Impulse.
Spresense main board with attached camera, sensor add-on, Wi-Fi add-on, and extension board.
Make sure the SD card is formatted as FAT before inserting it into the Spresense.
Use a micro-USB cable to connect the main development board (not the extension board) to your computer.
The development board does not come with the right firmware yet. To update the firmware:
- 3.Open the flash script for your operating system (
flash_linux.sh) to flash the firmware.
- 4.Wait until flashing is complete. The on-board LEDs should stop blinking to indicate that the new firmware is running.
From a command prompt or terminal, run:
Mac: Device choice
If you have a choice of serial ports and are not sure which one to use, pick /dev/tty.SLAB_USBtoUART or /dev/cu.usbserial-*
This will start a wizard which will ask you to log in and choose an Edge Impulse project. If you want to switch projects run the command with
Alternatively, recent versions of Google Chrome and Microsoft Edge can collect data directly from your development board, without the need for the Edge Impulse CLI. See this blog post for more information.
That's all! Your device is now connected to Edge Impulse. To verify this, go to your Edge Impulse project, and click Devices. The device will be listed here.
Device connected to Edge Impulse.
With everything set up you can now build your first machine learning model with these tutorials:
Looking to connect different sensors? The Data forwarder lets you easily send data from any sensor into Edge Impulse.
If you see:
ValueError: dlsym(RTLD_DEFAULT, kIOMasterPortDefault): symbol not found
pip3 install --upgrade pyserial
edge-impulse-run-impulsecommands do not start it might be because of an error interacting with the SD card or because your board has an old version of the bootloader. To see the debug logs, run:
And press the RESET button on the board. If you see
Welcome to nashyou'll need to update the bootloader. To do so:
- 1.Install and launch the Arduino IDE.
- 2.Go to Preferences and under 'Additional Boards Manager URLs' add
https://github.com/sonydevworld/spresense-arduino-compatible/releases/download/generic/package_spresense_index.json(if there's already text in this text box, add a
,before adding the new URL).
- 3.Then go to Tools > Boards > Board manager, search for 'Spresense' and click Install.
- 4.Select the right board via: Tools > Boards > Spresense boards > Spresense.
- 5.Select your serial port via: Tools > Port and selecting the serial port for the Spresense board.
- 6.Select the Spresense programmer via: Tools > Programmer > Spresense firmware updater.
- 7.Update the bootloader via Tools > Burn bootloader.