XIAO nRF54L15 Sense Simulator
Nordic's next-generation Cortex-M33, with RRAM
Simulate the Seeed Studio XIAO nRF54L15 Sense in your browser for free: Arduino firmware on an in-browser nRF54L15 engine, a live 6-axis IMU, USB serial, and GPIO, I2C and SPI on a live circuit canvas.
Free plan · No install, no account · Runs in your browser
XIAO nRF54L15 Sense at a glance
The nRF54L15 is a Cortex-M33 at 128 MHz with RRAM instead of flash, and the XIAO Sense variant adds a 6-axis IMU. The in-browser engine boots the firmware the community nRF54 Arduino core produces; the IMU is live from the Sensors popover and, as on the real board, answers once the sketch has switched on its supply rail.
- Processor
- Nordic nRF54L15, Cortex-M33 at 128 MHz
- Memory
- 256 KB RAM · 1.5 MB RRAM
- Emulation
- nrf54ljs (in-browser)
- Languages
- Arduino C++
- Plan
- Free
What you can do with the XIAO nRF54L15 Sense simulator
The board on the canvas is the real thing as far as your code is concerned: the same pins, the same buses, the same peripherals, wired to the same 100+ sensors, displays and actuators every other Velxio board talks to.
Live 6-axis IMU
Press Sensors on the canvas toolbar and drag the Tilt pad: the part reports that gravity at its real I2C address, and your orientation code reacts.
Arduino C++ sketches
Write a sketch in the Monaco editor with library completion, compile it against the board's own Arduino core and run the real firmware binary. The Serial Monitor is the USB port.
GPIO, PWM and ADC
Drive LEDs, relays and servos, read buttons and potentiometers, dim with PWM. Every pin follows the board's real pin map, so what works here works on the hardware.
I2C, SPI and UART
Talk to OLEDs, IMUs, ADCs, RTCs and SD cards over the buses the board really has. Bus traffic runs through emulated peripherals, not through a shortcut.
Serial Monitor
USB CDC serial reaches the Serial Monitor at the sketch's baud rate, with input, timestamps and a plotter.
What is not emulated
The radio (Bluetooth, Zigbee, Thread or WiFi, depending on the chip) is not modelled. Everything wired to the pins is; the wireless part of a project stays on the bench.
XIAO footprint
The thumbnail-sized XIAO pinout: D0 to D10 with the I2C, SPI and UART pads where every XIAO has them, so projects move between XIAO boards with a pin map check.
SPICE analog parts
Op-amps, transistors, regulators and passives simulate in real time with ngspice in the browser; the board's pins drive them and read the solved voltages back.
XIAO nRF54L15 Sense examples
Ready-to-run projects for this board from the gallery. Open one, read the sketch, press Run.
XIAO nRF54L15 Sense: BlinkBlink an LED on D1 and count on the serial monitor - the first thing to try on the XIAO nRF54L15 Sense, running on its own in-browser engine.
XIAO nRF54L15 Sense: OLED over I2CWrite text to a 128x64 SSD1306 on the XIAO nRF54L15 Sense's I2C pads (D4/D5) with U8g2, and mirror it on the serial monitor.
XIAO nRF54L15 Sense: Knob and buttonRead a potentiometer on D0 and a pull-up button on D2 of the XIAO nRF54L15 Sense; the button lights the LED and both values print on the serial monitor.
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Frequently asked questions
- Which Arduino core does the XIAO nRF54L15 use?
- The community nRF54 Arduino core. The sketch compiles against it and the engine runs the binary, so library behaviour follows the core.
- Is the radio emulated?
- No. Bluetooth and the other radio protocols are not modelled; prototype the sensing and logic here.
- How do I power the IMU in a sketch?
- Drive the IMU_MIC_PWR rail high before talking to the sensor, as Seeed's examples do. Until then the part does not answer, on the board or here.
- Is the XIAO nRF54L15 Sense simulator free?
- Yes. The XIAO nRF54L15 Sense runs on the free plan: open the editor, place the board and press Run. No install and no account are needed, and Velxio's editor and simulator core are open source under the GNU AGPLv3.
- Which languages can I use on the XIAO nRF54L15 Sense?
- Arduino C++. The language is switched from the toolbar; the circuit on the canvas stays the same.
Ready to simulate the XIAO nRF54L15 Sense?
Open the editor, place the XIAO nRF54L15 Sense from the picker, wire what you need and press Run.
Launch the XIAO nRF54L15 Sense simulator →