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Bus Pirate

Universal bus interface (1-Wire, I2C, SPI, JTAG)

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ID: 187713

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Bus Pirate
Universal bus interface (1-Wire, I2C, SPI, JTAG)

Interfacing a new microchip can be a hassle. Breadboarding a circuit, writing code, hauling out the programmer, or maybe even prototyping a PCB. We never seem to get it right on the first try.
The ‘Bus Pirate’ is a universal bus interface that talks to most chips from a PC serial terminal, eliminating a ton of early prototyping effort when working with new or unknown chips. Many serial protocols are supported at 0-5.5volts, more can be added.

  • 1-Wire
  • I2C
  • SPI
  • JTAG
  • Asynchronous serial
  • MIDI
  • PC keyboard
  • HD44780 LCD
  • 2- and 3-wire libraries with bitwise pin control
  • Scriptable binary bitbang, 1-Wire, I2C, SPI, and UART modes


  • 0-6volt measurement probe
  • 1Hz-40MHz frequency measurement
  • 1kHz - 4MHz pulse-width modulator, frequency generator
  • On-board multi-voltage pull-up resistors
  • On-board 3.3volt and 5volt power supplies with software reset
  • Macros for common operations
  • Bus traffic sniffers (SPI, I2C)
  • A bootloader for easy firmware updates
  • Transparent USB->serial mode
  • 10Hz-1MHz SUMP compatible low-speed logic analyzer
  • AVR STK500 v2 programmer clone
  • Supported in AVRDude programmer
  • Scriptable from Perl, Python, etc.


  • Bus Pirate board

Documentation and software


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