P-Star 25K50 Micro

SKU: POLOLU-3150 Brand: Pololu

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This product has been retired. It is no longer available, but this page has been kept for reference.

P-Star 25K50 with U.S. quarter for size reference.

The Pololu 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.

Pololu's comprehensive user’s 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.

P-Star 25K50 Micro, bottom view.

P-Star 25K50 Micro, top view.

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’s guide

Pinout

P-Star 25K50 Micro pinout diagram.

This diagram identifies the I/O and power pins on the P-Star 25K50 Micro. The diagram is also available as a printable PDF (161k 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.

P-Star 25K50 Micro with included optional headers.

The P-Star 25K50 Micro with soldered headers and connected USB cable.

People often buy this product together with:

A-Star 32U4 Micro

Dimensions

Size:	0.6" × 1.05" × 0.18"¹
Weight:	1.3 g²

General specifications

Processor:	PIC18F25K50
RAM size:	2 Kbytes
Program memory size:	32 Kbytes³
Motor channels:	0
User I/O lines:	19⁴
Minimum operating voltage:	5.5 V
Maximum operating voltage:	15 V
Logic voltage:	5 V
Reverse voltage protection?:	Y⁵
External programmer required?:	N

Identifying markings

PCB dev codes:	pc01a

Notes:

1: Without included optional headers. This measurement includes the USB Micro-B connector, which extends 0.05" past the edge of the PCB.
2: Without included optional headers.
3: 8 KB of the MCU's 32 KB of flash memory is used by the pre-installed USB bootloader. All 32 KB is available if you use an external programmer and erase the bootloader.
4: All 19 can be used as digital I/O, 14 can be used as analog inputs, and one can be an analog output. 16 of the 19 are available along the sides for use in a breadboard.
5: On VIN.

Documentation and other information

Pololu P-Star User’s Guide (Printable PDF)

User’s manual for the Pololu P-Star programmable modules.

File downloads

P-Star 25K50 Micro pinout diagram (161k pdf)

Printable pinout diagram of the P-Star 25K50 Micro.
P-Star 25K50 Micro schematic diagram (414k pdf)

Printable schematic of the P-Star 25K50 Micro.
P-Star 25K50 Micro dimension diagram (202k pdf)

Printable dimension diagram of the P-Star 25K50 Micro.
Pololu USB Bootloader Utility (p-load) for Windows (1MB msi)
Pololu USB Bootloader Utility (p-load) for macOS (87k pkg)
Pololu USB Bootloader Utility (p-load) for Linux (x86) (478k xz)
Pololu USB Bootloader Utility (p-load) for Linux (Raspberry Pi) (374k xz)
Drill guide for the P-Star 25K50 Micro (34k dxf)

This DXF drawing shows the locations of all of the board’s holes.

Recommended links

PIC18F25K50 documentation

Microchip’s product page for the PIC18F25K50, with links to its datasheet and other resources.
Pololu USB Bootloader Utility (p-load) source code
MPLAB X Integrated Development Environment (IDE)

MPLAB X is a free IDE from Microchip for programming their PIC microcontrollers. It runs on Windows, Max OS X, and Linux. MPLAB X comes with the a simulator and the MPASM assembler. It works well with the MPLAB XC Compilers and the PICkit 3.
MPLAB XC Compilers

The MPLAB XC Compilers from Microchip are a family of C compilers for PIC MCUs. The compilers are free to use, but paid versions are available that provide better optimizations.
P-Star Examples

A collection example code and libraries for the P-Star.
PICkit 3

Microchip’s PICkit 3 programmer is a low-cost hardware debugger and programmer for PIC microcontrollers.
SDCC – Small Device C Compiler

SDCC is a free and open source compiler that supports many types of microcontrollers, including PIC MCUs that use the PIC18 architecture. The PIC18s are called PIC16 in the SDCC documentation and command-line interface because the instructions are 16 bits wide. As of August 2014, the SDCC manual states that the support for these PIC microcontrollers “is not yet mature and still lacks many features”.
PICBASIC PRO Compiler 3.0

A BASIC compiler that targets PIC microcontrollers.
M-Stack

M-Stack is an open source USB Stack from Signal 11 Software for Microchip PIC microcontrollers.
RPicSim

The RPicSim library provides an interface to the MPLAB X PIC simulator that allows you to write simulator-based automated tests of PIC firmware. RPicSim is written in the Ruby language and runs on JRuby.
XPRESS-BootLoader

This bootloader can run on the P-Star 25K50. It acts as a USB mass storage device and allows the P-Star to be programmed by copying a HEX file onto it.

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Retired

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