Source: https://mokxi.com/raspberry-pi-pico-simulator Updated: 2026-09-27 Simulator # Raspberry Pi Pico simulator, running in this tab Mokxi is a free Raspberry Pi Pico simulator that runs in your browser, with nothing to install and no account needed. Mokxi models the Raspberry Pi Pico on our own Cortex-M0+ core, running the RP2040 at 125 MHz on its real register map, so a build that runs here runs on the board on your desk. Sign up free or see the full Pico board page - 192 parts on the bench - 25 boards running now - 1.00x real time, on every board Click to open it in the editor Real firmware, running right now on our own core. Click it to open the circuit in the editor. What is modeled ## The numbers, not the marketing Taken from the board's own contract document and put in plain words. The core Cortex-M0+ (ARMv6-M), one core, at 125 MHz, with the datasheet cycle count of every instruction. Peripherals SIO GPIO on the real IO_BANK0, PADS_BANK0 and SIO offsets, a 64-bit microsecond timer with four alarms, UART0, and eight PWM slices with two channels each, so analogWrite works on every GPIO pin. What is not there yet The second core, PIO, DMA and the ADC. SIO.CPUID reads 0, and GP26 to GP28 are plain GPIO pins here. Go further ## The full board page Every peripheral area, every example and the wiring notes, in one place. Raspberry Pi Pico simulator Blink, a button and the serial monitor, running. ## Questions Which Pico does this simulate? The original Raspberry Pi Pico, on the RP2040. Does it run Pico SDK binaries? No. The SDK needs the second-stage bootloader and clock tree, neither of which is modeled. The firmware runtime here is ours, and it is Arduino-shaped. Will my firmware run on a real Pico? Yes, as long as it does not reach for the second core, PIO, DMA or the ADC. Is it free? Yes, with no card and no account needed to try it. ## Try your own firmware on the Pico What you build here runs on the board on your desk, unchanged. Nothing to install and no account needed. Start building Open the editor