Bus Pirate v4

92% of 100
universal bus interface that talks to electronics from a computer serial terminal 1Hz-40MHz frequency measurement 5 volt tolerant pins-0-6volt measurement probe 1kHz-4MHz pulse-width modulator, frequency generator 10Hz-1MHz low-speed logic analyzer
Out of stock
  • 10+: $33.44
  • 20+: $31.95


Bus Pirate v4 is a universal bus interface that talks to electronics from a computer serial terminal. Get to know a chip without writing code. Eliminates a ton of early prototyping effort with new or unknown chips. Seeed Studio is the official manufacturer and supporter of the Bus Pirate project. Version 4 is the next generation Bus Pirate hardware, but it's not as stable as Bus Pirate v3.

If you're just starting out with the Bus Pirate we still recommend v3 - it's cheaper, more reliable, and has all the same major features. See a Bus Pirate v4 vs v3 comparison. Protocols 1-Wire, I2C, SPI, JTAG, asynchronous serial (UART), MIDI, PC keyboard, HD44780 LCDs, and generic 2- and 3-wire libraries for custom protocols.


  • USB interface, USB powered

  • 5volt tolerant pins

  • 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)

  • Transparent USB->serial bridge mode

  • 10Hz-1MHz low-speed logic analyzer

  • Custom support in AVRDUDE, Flashrom, OpenOCD

  • AVR STK500 v2 programmer clone

  • Scriptable from Perl, Python, etc.

  • A bootloader for easy USB firmware updates

  • Open source (CC 0/public domain)

New in Bus Pirate v4

  • 256K program space, 4 times more flash than v3

  • Integrated, on-board USB (faster)

  • Data storage EEPROM to store settings

  • Software pull-up voltage selection: 3.3volt, 5volt, or external supply

  • 2 extra I/O pins

  • Multipurpose button

  • Bus Pirate v4 vs v3 comparison

Firmware Upgrade Notification

  • If you are unsatisfied with the current firmware version, please check with the newly upgrade firmware v6.1.

  • Each Bus Pirate v4 is tested before it leaves the factory, but please keep in mind that v4 is still experimental, unproven hardware. If in doubt please buy the cheaper Bus Pirate v3, it is still manufactured and actively supported. This hardware is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose.

  • If you encounter any problems when using this product, here is the forum from which you can get the technical support.

Technical details

Dimensions 0mm x0mm x0mm
Weight G.W 13g
Battery Exclude

Part List

Bus Pirate v4 1


HSCODE 8538900000
USHSCODE 85389030
UPC 841454111160



The BusPirate v3 is a universal bus interface that talks to electronics from a PC serial terminal, eliminating a ton of early prototyping effort when working with new or unknown chips.



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  1. Product Quality
  2. Product Quality
  3. Product Quality
    Excellent Seller and Product !!! THANKS !!! ++++++++++++
  4. Product Quality
    Bus Pirate v4 Most time i use this for IC interface verification. In these disciplines the bus pirate is without any competition. My second application is very fast T&M tools. In these disciplines he makes my HW complete. Best tool in its class
  5. Product Quality
    Garbage The firmware is incomplete out of the box and development has been abandoned by dangerous prototypes. I'm not talking missing features - rather, this thing is actually broken. The firmware frequently hangs and can only be recovered with a hard reset. If you have time to waste you could try your luck with the community firmware. Get the v3 instead.


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