The Pololu P-Star 25K50 Micro is a tiny programmable module featuring Microchip’s PIC18F25K50 microcontroller. It packs a Micro-USB interface and 19 digital input/output pins onto a board measuring only 1″ × 0.6″ and ships preloaded with a USB bootloader, so no external programmer is required. The P-Star 25K50 Micro is a general-purpose programmable module based on Microchip’s PIC18F25K50 microcontroller, which has 32 KB of flash program memory, 2 KB of RAM, and built-in USB functionality. On-board features of the P-Star (abbreviated P*) include a 16 MHz crystal, a USB Micro-B connector, and three user-controllable indicator LEDs. A voltage regulator and power selection circuit allow the board to be powered from either USB or an external 5.5 V to 15 V source, while a resettable PTC fuse on the USB VBUS supply and reverse protection on VIN help protect it from accidental damage. The board ships with a USB bootloader that makes it easy to program the PIC microcontroller without using an external programmer. Our comprehensive user guide provides the basics you need to get started with the P-Star 25K50 Micro as well as detailed technical information. This product requires a USB A to Micro-B cable (not included) to connect to a computer. Features * Dimensions: 1″ × 0.6″ (1.05″ × 0.6″ including USB Micro-B connector) * Programmable Microchip PIC18F25K50 microcontroller * 32 KB flash (8 KB used by bootloader, leaving 24 KB available for user program by default) * 2 KB SRAM * 256 bytes of EEPROM * Native full-speed USB (12 Mbps) * 5 V logic voltage * Internally clocked at 48 MHz, resulting in execution speeds up to 12 million instructions per second (MIPS) * Precision 16 MHz crystal * 19 I/O lines in a small package * 16 user I/O lines along the sides of the board * 3 additional I/O pins available in other locations * 14 pins can be configured as analog inputs * 2 PWM output signals (one of which can be sent to four different pins) * 5-bit digital-to-analog converter (DAC) output * Three user-controllable LEDs * USB Micro-B connector * Can be powered from USB or external source regulated to 5 V by onboard regulator * Operating voltage: 5.5 V to 15 V * Can operate down to 3.8 V with decreased logic voltage * Reverse-voltage protection on external power input * PTC fuse on VBUS supply * Ships with a proprietary USB bootloader developed by Pololu for the P-Star * Bootloader is usable from Windows, Linux, and Mac OS X with open source software * No external programmer required * Compatible with standard Microchip compilers, development tools, and programmers * Comprehensive user guide Pinout This diagram identifies the I/O and power pins on the P-Star 25K50 Micro. The diagram is also available as a printable PDF. For more information about the PIC18F25K50 microcontroller and its peripherals, see Microchip’s PIC18F25K50 documentation. Included hardware Two 1×10-pin breakaway 0.1″ male headers and one 1×6-pin breakaway 0.1″ male header are included with the P-Star 25K50 Micro. These header pins can be soldered in to use the board with perfboards, breadboards, or 0.1″ female connectors. Specifications Processor: PIC18F25K50 RAM size: 2 Kbytes Program memory size: 32 Kbytes Motor channels: 0 User I/O lines: 19 Minimum operating voltage: 5.5 V Maximum operating voltage: 15 V Logic voltage: 5 V Reverse voltage protection?: Y External programmer required?: N Size: 0.6″ × 1.05″ × 0.18″ Weight: 1.3 g Resources * Click here to view all resources * User Guide * Pinout * Dimensions https://elecena.pl/product/22726258/pololu-p-star-25k50-micro 2023-03-07 https://elecena.pl/product/22726258/pololu-p-star-25k50-micro 2023-12-27 https://elecena.pl/product/22726258/pololu-p-star-25k50-micro 2024-04-30 https://elecena.pl/product/22726258/pololu-p-star-25k50-micro 2024-09-18 https://elecena.pl/product/22726258/pololu-p-star-25k50-micro 2024-11-29 https://elecena.pl/product/22726258/pololu-p-star-25k50-micro 2024-11-30 https://elecena.pl/product/22726258/pololu-p-star-25k50-micro 2025-02-13 https://elecena.pl/product/22726258/pololu-p-star-25k50-micro 2025-04-09 https://elecena.pl/product/22726258/pololu-p-star-25k50-micro 2025-08-05 https://elecena.pl/product/22726258/pololu-p-star-25k50-micro 2025-11-28 https://elecena.pl/product/22726258/pololu-p-star-25k50-micro 2025-11-29 https://elecena.pl/product/22726258/pololu-p-star-25k50-micro 2026-01-08