PicoDOS

Overview

PicoDOS is a secure, feature-rich DOS-like operating environment for the Raspberry Pi Pico 2W. Building on the familiar command-line paradigm, PicoDOS adds a comprehensive IoT stack with RSA public-key encryption, XMODEM file transfer, FAT filesystem support (SD card), NTP time synchronisation, and OTA (over-the-air) firmware updates — all on the RP2350 platform.

The RSA implementation (using KEYGEN, PUBKEY, ENCRYPT, and DECRYPT commands) enables secure communications between PicoDOS devices or between PicoDOS and a remote host. This makes PicoDOS suitable for IoT deployments where data integrity and authenticity matter — sensor nodes that cannot be physically secured, remote actuators that must accept only authenticated commands.

File operations use a FAT filesystem on an optional SD card module, with full directory navigation (CD, LS, MD, RD, COPY, MOVE, RENAME). Batch scripts automate startup sequences; the ONTIME scheduler triggers commands at precise wall-clock times synced via NTP.

Key Features

• RSA public-key encryption — KEYGEN, PUBKEY, ENCRYPT, DECRYPT commands
• Full FAT filesystem (SD card) with file manager commands
• XMODEM file transfer — send/receive files via serial terminal
• IoT stack — WiFi STA + AP, NTP sync, UDP messaging, PING
• ONTIME scheduler — exact datetime-triggered automation
• OTA firmware updates — no cable required
• GPIO, ADC, PWM, I2C, SPI, UART — all via CLI commands
• Interactive terminal games — built-in entertainment for isolated deployments
• Memory monitoring — MEM command shows heap/stack usage in real time
• MONITOR command — system watchdog and health dashboard

Specifications